CN112674823B - Firing mechanism and anastomat - Google Patents

Abstract

The invention provides a firing mechanism and an anastomat, wherein the firing mechanism 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. 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 along the axial direction of the anastomat to reduce the left and right deflection of the nail anvil 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.

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 of cartridge assembly 35

11 proximal side 36 guide groove of cartridge assembly

Distal side 37 wedge of 12 cartridge assembly

13 staple cartridge face 4 cutter assembly

2 anvil 41 proximal side of the cutter assembly

21 anvil proximal side 42 distal side of cutter assembly

22 distal side 43 cutting edge of anvil

23 anvil 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 of firing block 442

31 proximal 443 first arc of firing Block

32 firing block distal 45 cutter recess

33 card slot 451 upper side wall

Lower side wall of third side wall 452 of 331 card slot

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

333 second cambered 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 a nail cartridge component 1 and an anvil 2, wherein one side of the nail cartridge component 1 facing the anvil 2 is provided with a nail cartridge surface 13, and one side of the anvil 2 facing the nail cartridge component 1 is provided with a nail anvil surface 23. A firing mechanism is arranged in the nail head part and comprises a firing block 3 and a cutter 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, the firing block 3 pushes the anastomotic nails in the nail bin assembly 1 to move towards the nail anvil surface 23 of the nail anvil 2, the anastomotic nails are closed and formed on the nail anvil surface 23, and meanwhile, the cutter 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, the distal end side 12 of the cartridge assembly 1 is the left end side of the cartridge assembly 1, and the proximal end side 11 of the cartridge assembly 1 is the right end side of the cartridge assembly 1. The far end side 22 of the nail anvil 2 is the left end side of the nail anvil 2, and the near end side 21 of the nail anvil 2 is the right end side of the nail anvil 2. In the view of fig. 6, the distal side 32 of the firing block 3 is the left end side of the firing block 3, and the proximal side 31 of the firing block 3 is the right end side of the firing block 3. The distal end side of cutter unit 4 is the left end side of cutter unit 4, the proximal end side of cutter unit 4 is the right end side of cutter 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 the knife assembly 4 from swinging left and right relative to the cartridge assembly 1 when moving along the axial direction of the stapler, a matching structure is arranged between the firing block 3 and the knife assembly 4, and the left and right swinging movement of the knife assembly 4 is limited by the firing block 3. As shown in FIGS. 5 to 7, a locking slot 33 is formed on the proximal end 31 of the trigger block 3, and a clamping arm 34 is formed on each of two side walls of the locking slot 33. The cutter assembly 4 is located at the proximal end side 31 of the firing block 3, the distal end side 42 of the cutter assembly 4 is provided with a first matching portion 44, and the first matching portion 44 at least partially enters the clamping groove 33, so that the clamping arms 34 are respectively located at the left side and the right side of the first matching portion 44.

Therefore, during the process of firing the anastomat, the clamping groove 33 of the firing block 3 is matched with the first matching part 44 of the cutter assembly 4, the clamping arm 34 of the firing block 3 limits the movement of the cutter assembly 4 in the left-right direction, and during the process of firing, the cutter assembly 4 moves along the axial direction of the anastomat to reduce the left-right deflection relative to the nail bin assembly 1, so that the movement stability of the cutter assembly 4 is maintained.

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

Therefore, when the cutter component 4 is matched with the cutter groove 24 in the nail anvil 2, the position of the nail anvil 2 is limited by the cutter component 4 with relatively stable position when moving in the cutter groove 24, so that the nail anvil 2 and the nail bin component 1 are kept aligned up and down, the forming groove on the nail anvil surface 23 and the anastomosis nail in the nail bin component 1 are always in a mutually aligned state, the nail feet of the anastomosis nail in the nail 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, the firing block 3 is provided with at least one guide groove 36, the guide groove 36 extends along the axial direction of the stapler, and the guide groove 36 is matched with the cartridge module 1 of the stapler to guide the movement of the firing block 3 along the axial direction of the stapler. When the anastomat is fired and the firing block 3 moves from the proximal end side 11 to the distal end side 12 of the cartridge component 1, the guide groove 36 of the firing block 3 limits the firing block 3 not to swing left and right relative to the cartridge component 1, so that the motion stability of the firing block 3 can be maintained. And the firing block 3 can further maintain the motion stability of the knife assembly 4 and can maintain the upper and lower alignment of the anvil 2 and cartridge assembly 1 through the knife assembly 4.

Further, as shown in fig. 5 to 7, the firing 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 the guide groove 36 is formed between two adjacent wedge blocks 37. The distal side of each wedge block 37 is a staple pushing surface which can push staples in the cartridge assembly 1 to move towards the anvil 2 when moving towards the distal side of the cartridge assembly 1. The locking groove 33 is formed between two wedge blocks 37 in the middle. In this embodiment, the firing block 3 includes four wedge blocks 37: the left and right sides respectively include a wedge block 37 located at the outer side and a wedge block 37 located at the middle portion. The gripping arms 34 are provided integrally with the wedge blocks 37, and the outer side walls of the gripping arms 34 are flush with the outer side walls of the two wedge blocks 37 of the middle part, i.e. the gripping arms 34 extend proximally from the two wedge blocks 37 of the middle part, so that the positional stability of the gripping arms 34 is higher.

In this embodiment, as shown in fig. 7 to 11, the first engaging portion 44 is a wedge-shaped engaging portion, and the shape of the catching groove 33 of the firing block 3 is adapted to the shape of the wedge-shaped engaging portion, that is, the catching groove 33 of the firing 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 with cutter unit spare 4 and percussion block 3 looks mutual separation.

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

As shown in fig. 8 to 11, the first fitting portion 44 includes a first side wall 441 and a second side wall 442, a distal end side of the first side wall 441 is inclined toward the second side wall 442 with respect to a proximal end side thereof, and the second 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 the second sidewall 442 may be inclined relative to the proximal side thereof toward the first sidewall 441, so that the first 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 the first sidewall 441 is inclined toward the second sidewall 442 with respect to the distal side thereof, or that both the first sidewall 441 and the second sidewall 442 extend in the axial direction of the stapler such that the first fitting portion 44 forms a structure similar to a rectangle.

As shown in fig. 11, the distal end side of the first side wall 441 is connected to the distal end side of the second side wall 442 by a first arc surface 443 to achieve a smooth fit between the first fitting portion 44 and the card slot 33.

As shown in fig. 7 and 13, the shape of the card slot 33 is adapted to the shape of the first fitting portion 44. Specifically, the locking groove 33 includes a third sidewall 331 and a fourth sidewall 332, a distal end side of the third sidewall 331 is inclined toward the fourth sidewall 332 with respect to a proximal end side thereof, and the fourth sidewall 332 extends in an axial direction of the stapler. A distal end side of the third side wall 331 and a distal end side of the fourth side wall 332 are connected by a second curved surface 333 to achieve a smooth fit between the first fitting portion 44 and the card slot 33. When it is desired to connect the firing block 3 and the knife assembly 4, it is sufficient to align the proximal side 31 of the firing block 3 with the distal side 41 of the knife assembly 4 and to allow the first mating portion 44 to enter the catch 33. When it is desired to separate the firing block 3 from the knife assembly 4, the knife assembly 4 may be moved proximally or the firing block 3 may be moved distally. The first and second cambered surfaces 443, 333 also provide smoother guidance for the combination and separation of the firing block 3 and the knife assembly 4.

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

As shown in fig. 3 to 4 and 8 to 9, in this embodiment, the cutter assembly 4 is an i-shaped cutter assembly 4 comprising an upper beam 46 and a lower beam 46, and the upper beam 46 is matched with the cutter slot 24 of the anvil 2. The first mating portion 44 is located between the upper cross member 46 and the lower cross member 46. Further, a cutting edge 43 for cutting tissue is disposed between the upper cross beam 46 and the lower cross beam 46 of the cutter assembly 4, and the first matching portion 44 is located between the cutting edge 43 and the lower cross beam 46, so that the normal operation of the cutting edge 43 is not affected while the motion stability of the cutter assembly 4 is ensured.

Further, when the firing block 3 moves towards the distal end side 12 of the cartridge module 1 to push staples, the distal end side 32 of the firing block 3 may receive a reaction force generated during staple formation to tilt the proximal end side 31 of the firing block 3, so that a friction force between the firing block 3 and the cartridge rack of the cartridge 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, the distal side 42 of the cutter assembly 4 is further provided with a cutter groove 45, the proximal side 31 of the firing block 3 is further provided with a second matching portion 35, the second matching portion 35 at least partially enters the cutter groove 45, the cutter groove 45 comprises an upper side wall 451 and a lower side wall 452, and the upper side wall 451 and the lower side wall 452 of the cutter groove 45 are located on the upper side and the lower side of the second matching portion 35.

Therefore, through can set up second cooperation portion 35 and cutter recess 45 mutually supporting on percussion block 3 and cutter subassembly 4, the upper and lower lateral wall 451 of cutter recess 45, 452 cooperate with the corresponding upper and lower surface of second cooperation portion 35 respectively, when percussion block 3 is in the percussion process, when distal end side 32 of percussion block 3 receives the reaction force when the anastomotic nail shaping and makes the near-end side 31 of percussion block 3 have the perk trend, the upper and lower lateral wall of cutter recess 45 exerts the power that keeps percussion block 3 parallel motion to the second cooperation portion 35 of near-end side 31 of percussion block 3, thereby reduce the frictional force between percussion 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 second fitting portion 35 is located on the distal end side of the catching groove 33, and the first fitting portion 44 is located on the proximal end side of the cutter groove 45. Thus, the proximal side 31 of the firing block 3 and the distal side 42 of the knife assembly 4 form a defined fit in both a left-right position and an up-down position. The clamping groove 33 and the cutter groove 45 are mutually embedded, and the triggering block 3 and the cutter 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 the cutter groove 45 have third cambered surfaces 453, respectively. When it is desired to connect the firing block 3 and the knife assembly 4, the proximal side 31 of the firing block 3 is aligned with the distal side 41 of the knife assembly 4 such that the first mating portion 44 enters the slot 33 and the second mating portion 35 enters the knife recess 45. When it is desired to separate the firing block 3 from the knife assembly 4, the knife assembly 4 may be moved proximally or the firing block 3 may be moved distally. The third camber 453 also provides a smoother guide for the combination and separation of the firing block 3 and the knife assembly 4.

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

As shown in fig. 9 and 13, the catch 33 of the firing block 3 is a wedge-shaped slot including a third sidewall 331 and a fourth sidewall 332, a distal side of the third sidewall 331 being inclined toward the fourth sidewall 332 with respect to a proximal side thereof. As seen in fig. 9 and 13, a projection of the clamping arm 34 corresponding to the third side wall 331 (i.e. the clamping arm 34 at the top in the view of fig. 13) on the plane of the lower side wall 452 of the cutter groove 45 at least partially falls within the range of the lower side wall 452 of the cutter groove 45, i.e. the clamping arm 34 corresponding to the third side wall 331 is at least partially located inside the cutter groove 45. Therefore, the upper and lower side walls 451, 452 of the cutter groove 45 not only limit the upper and lower surfaces of the second engagement portion 35, but also limit at least a part of the upper and lower surfaces of the clamp arm 34 corresponding to the third side wall 331, thereby realizing a more stable engagement structure between the trigger block 3 and the cutter 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.

Claims (14)

1. A firing mechanism for a stapler, the firing mechanism comprising:

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, 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, the first matching portion is a wedge-shaped matching portion, and the shape of the clamping groove of the firing block is matched with that of the wedge-shaped matching portion.

2. The firing mechanism of claim 1, wherein the stapler includes a cartridge assembly and an anvil disposed opposite to each other, wherein a cutter slot is disposed on an anvil surface of the anvil, wherein the cutter assembly partially enters the cutter slot, and wherein the cutter assembly is movable along an extending direction of the cutter slot.

3. The firing mechanism of claim 1, wherein a width of a proximal side of the first engagement feature is greater than a width of a distal side of the first engagement feature.

4. The firing mechanism of claim 1, wherein 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.

5. The firing mechanism of claim 4, wherein the distal side of the first sidewall is connected to the distal side of the second sidewall by a first arcuate surface.

6. The firing mechanism of claim 1, wherein the catch includes a third sidewall and a fourth sidewall, a distal side of the third sidewall being inclined toward the fourth sidewall relative to a proximal side thereof, 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.

7. The firing mechanism of claim 1, wherein the cutter assembly is an i-shaped cutter assembly including an upper beam and a lower beam, the first engagement portion being located between the upper beam and the lower beam.

8. The firing mechanism of claim 7, wherein a cutting edge is disposed between the upper and lower cross-beams of the cutter assembly, and the first engagement portion is located between the cutting edge and the lower cross-beam.

9. The firing mechanism as claimed in claim 1, wherein said knife assembly further comprises a knife recess disposed on a distal side thereof, said firing block further comprises a second engaging portion disposed on a proximal side thereof, said second engaging portion at least partially extends into said knife recess, and two sidewalls of said knife recess are disposed on upper and lower sides of said second engaging portion.

10. The firing mechanism of claim 9, wherein the distal sides of the upper and lower sidewalls of the cutter recess each have a third cambered surface.

11. The firing mechanism of claim 9, wherein the second engagement is located on a distal side of the catch and the first engagement is located on a proximal side of the cutter recess.

12. The firing mechanism of claim 11, wherein the catch of the firing block is a wedge-shaped slot comprising a third sidewall and a fourth sidewall, a distal side of the third sidewall being inclined relative to a proximal side thereof toward the fourth sidewall, a corresponding clamping arm of the third sidewall being at least partially disposed within the cutter recess.

13. The firing mechanism of claim 1, wherein the firing block defines at least one guide slot extending along an axial direction of the stapler, the guide slot cooperating with a cartridge assembly of the stapler to guide 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.

14. A stapler characterized by comprising the firing mechanism of any one of claims 1 to 13.

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