CN212089647U - Nail bin assembly of linear anastomat - Google Patents

Abstract

The utility model discloses a nail bin component of a straight line anastomat, which is characterized in that three rows of upper nail cavities and three rows of lower nail cavities are distributed at the upper half part and the lower half part of a nail bin in a staggered manner, so that the maximum force borne by a nail pushing particle inserted in the nail cavity is staggered with each other, a first nail pushing particle is simultaneously inserted in a first nail cavity and a second nail cavity, a second nail pushing particle is inserted in a third nail cavity, and the first inclined plane used for pushing the first nail pushing particle is smaller than the gradient of a second inclined plane used for pushing the second nail pushing particle, thus ensuring that the forward thrust of a nail pushing block is smaller under the condition of generating the same upward thrust, in addition, the peaks of the first inclined plane and the second inclined plane on the nail pushing block are staggered with each other, the time of the first nail pushing particle and the second nail pushing particle reaching the peak is staggered, avoiding the situation that three rows of nails reach the highest points simultaneously, thereby further reducing the thrust required by the nail pushing block, the whole suturing process is more stable, the operation fatigue of doctors is relieved, and the suturing effect is optimized.

Description

Nail bin assembly of linear anastomat

Technical Field

The utility model relates to the technical field of medical equipment, more specifically say, relate to a nail storehouse subassembly of straight line anastomat.

Background

The anastomat is a device used in medicine to replace manual suture, and is mainly used for closing stumps or incisions in endoscopic gastrointestinal reconstruction and organ resection operations. Is suitable for various open or minimally invasive common surgeries, obstetrics and gynecology, urology surgery, thoracic surgery and pediatric surgeries. They may be used in conjunction with staple lines or tissue supporting materials.

Due to the development of modern science and technology and the improvement of manufacturing technology, the anastomat used clinically at present has the advantages of reliable quality, convenient use, tightness, proper tightness, quick suture, simple and convenient operation, few side effects and operation complications and the like, and can also ensure that the tumor operation which cannot be resected in the past can be resected with premonition, thereby being popular and advocated by clinical surgeons at home and abroad. The stapler mainly works on the principle that titanium nails are used for separating or anastomosing tissues, and is similar to a stapler.

Traditional anastomat carries out the pressfitting back to the sewing nail, drives the cutting knife through the firing rod and gos forward, and the cutting knife promotes the ejector pad simultaneously and gos forward, drives the direction motion of nail grain perpendicular to ejector pad that pushes away, finally pushes away the nail grain and drives to sew up the nail and take place bending forming under the forcing of propping nail seat recess. However, if the striking force is too large, the holding force between the arms and hands of the surgeon is too large, which may cause surgical fatigue of the surgeon. More seriously, when the instrument is driven deep into the tissue, the force of the trigger is too great, which causes the hand to shake when the sutured tissue is cut, which in turn causes the cutting assembly to shake, possibly damaging other normal tissue. Meanwhile, the shaking of the cutting component can cause poor consistency of sewing and forming and poor nail forming.

Therefore, how to solve the problem of too large percussion force of the existing anastomat is a problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a straight line anastomat's storehouse nail subassembly can effectively reduce the percussion power dynamics of anastomat, alleviates doctor's operation fatigue, optimizes the identical effect.

In order to achieve the above object, the present invention provides the following technical solutions:

a nail bin assembly of a linear anastomat comprises a nail bin, wherein a nail cavity is formed in the nail bin, nail pushing particles used for placing suturing nails are arranged in the nail cavity in a vertically sliding mode, the nail bin is divided into an upper half portion and a lower half portion by a cutter groove, the nail cavity comprises three rows of upper nail cavities distributed in the upper half portion in a staggered mode and three rows of lower nail cavities distributed in the lower half portion in a staggered mode, the upper nail cavities and the lower nail cavities are symmetrically arranged relative to the cutter groove, and the distances between the upper nail cavities and the lower nail cavities relative to the cutter groove from near to far are respectively a first row of nail cavities, a second row of nail cavities and a third row of nail cavities;

the nail pushing particles comprise first nail pushing particles and second nail pushing particles, the first nail pushing particles are inserted into the first nail cavity and the second nail cavity simultaneously, the second nail pushing particles are inserted into the third nail cavity, a sliding groove communicated with the nail cavities is formed in the bottom of the nail bin along the length direction of the cutter groove, a nail pushing block used for jacking the nail pushing particles is slidably arranged in the sliding groove and comprises a first inclined surface and a second inclined surface, the first inclined surface is used for jacking the first nail pushing particles, the second inclined surface is used for jacking the second nail pushing particles, the included angle between the first inclined surface and the sliding groove in the length direction is smaller than the included angle between the second inclined surface and the sliding groove in the length direction, and the first inclined surface and the second inclined surface are the same in maximum height and are distributed in a staggered mode along the length direction of the sliding groove.

Preferably, the nail pushing block is arranged on the front side of the first inclined surface and the front side of the second inclined surface and used for jacking the nail pushing particles, and an included angle between the third inclined surface and the length direction of the sliding groove is larger than that between the second inclined surface and the length direction of the sliding groove.

Preferably, the third inclined plane is respectively connected with the first inclined plane and the second inclined plane in a circular arc smooth manner.

Preferably, the nail pushing block comprises a first push plate used for jacking the first nail pushing particles and a second push plate used for jacking the second nail pushing particles, the first inclined plane is arranged on the first push plate, and the second inclined plane is arranged on the second push plate.

Preferably, the sliding grooves include a first sliding groove in sliding fit with the first pushing plate and a second sliding groove in sliding fit with the second pushing plate.

Preferably, a fourth inclined plane matched with the first inclined plane is arranged at the bottom of the first nail pushing particle, and the fourth inclined plane is parallel to the first inclined plane.

Preferably, a fifth inclined plane matched with the second inclined plane is arranged at the bottom of the second nail pushing particle, and the fifth inclined plane is parallel to the second inclined plane.

Preferably, the upper surface of the nail bin is provided with an outward convex step at the position of the first row of nail cavities.

Preferably, the first row of staple cavities is aligned with the third row of staple cavities in parallel, and the second row of staple cavities is distributed between adjacent first row of staple cavities.

The utility model provides a nail bin component of straight line anastomat, through with the crisscross distribution in the first half and the lower half of nail bin of triplex row upper nail chamber and triplex row lower nail chamber, so that the biggest power that receives in the process of becoming the nail of the ejector pin grain of cartridge in the nail chamber staggers each other, first ejector pin grain cartridge in first row nail chamber and second row nail chamber simultaneously, second ejector pin grain cartridge in third row nail chamber, and the slope that is used for promoting the first inclined plane of first ejector pin grain is less than the second inclined plane that is used for promoting the second ejector pin grain, so, can guarantee under the condition that produces the same upward thrust, ejector pin piece forward thrust is less, in addition, the peak of first inclined plane and second inclined plane on the ejector pin piece staggers each other, can make first ejector pin grain and second ejector pin grain arrive the time of sewing up the peak stagger, avoid triplex row to reach the peak simultaneously, thereby further reduce the required thrust of ejector pin piece, the percussion force of the anastomat is reduced, the whole suturing process is more stable, the operation fatigue of doctors is relieved, and the suturing effect is optimized.

Drawings

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

Fig. 1 is a schematic view of a specific embodiment of a staple cartridge assembly of a linear stapler provided by the present invention;

FIG. 2 is an exploded view of an embodiment of a staple cartridge assembly of the linear stapler of the present invention;

FIG. 3 is a schematic top view of the staple cartridge;

FIG. 4 is a schematic cross-sectional view taken along line A-A in FIG. 3;

FIG. 5 is a schematic structural view of a nail pushing block;

FIG. 6 is a schematic side view of the staple pusher;

FIG. 7 is a schematic structural view of a first staple pushing pellet;

fig. 8 is a schematic structural view of a second staple pushing particle.

The nail pushing device comprises a nail storage box 1, a cutter groove 11, a cutter groove 12, an upper half part 13, a lower half part 14, a step 2, a sewing nail, a nail pushing particle 3, a first nail pushing particle 31, a fourth inclined surface 311, a second nail pushing particle 32, a fifth inclined surface 321, a nail cavity 4, a first nail cavity 41, a second nail cavity 42, a third nail cavity 43, a nail pushing block 5, a first inclined surface 51, a second inclined surface 52, a third inclined surface 53, a first push plate 54, a second push plate 55, a slide groove 6, a second slide groove 61 and a first slide groove 62.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a storehouse of sharp anastomat is followed closely the subassembly, can effectively reduce the percussion power dynamics of anastomat, alleviates doctor's operation fatigue, optimizes the identical effect.

Referring to fig. 1 to 8, fig. 1 is a schematic view of a staple cartridge assembly of a linear stapler according to an embodiment of the present invention; FIG. 2 is an exploded view of an embodiment of a staple cartridge assembly of the linear stapler of the present invention; FIG. 3 is a schematic top view of the staple cartridge; FIG. 4 is a schematic cross-sectional view taken along line A-A in FIG. 3; FIG. 5 is a schematic structural view of a nail pushing block; FIG. 6 is a schematic side view of the staple pusher; FIG. 7 is a schematic structural view of a first staple pushing pellet; fig. 8 is a schematic structural view of a second staple pushing particle.

The utility model provides a nail storehouse subassembly of straight line anastomat, including nail storehouse 1, be equipped with nail chamber 4 on nail storehouse 1, what can slide from top to bottom in nail chamber 4 is equipped with and is used for placing stitching closely 2 pushes away the nail grain 3, nail storehouse 1 is divided into first 12 and lower half 13 by sword groove 11, nail chamber 4 includes that triplex row staggers in the last nail chamber of first 12 and triplex row staggers in the lower half 13 lower nail chamber, the relative sword groove 11 symmetry setting of upper nail chamber and lower nail chamber, the distance of the relative sword groove 11 of upper nail chamber and lower nail chamber is equallyd divide into first line nail chamber 41, second line nail chamber 42 and third line nail chamber 43 from near to far respectively;

the nail pushing particles 3 comprise first nail pushing particles 31 which are simultaneously inserted into the first row of nail cavities 41 and the second row of nail cavities 42, and second nail pushing particles 32 which are inserted into the third row of nail cavities 43, a sliding chute 6 which is communicated with the nail cavities 4 is formed in the bottom of the nail bin 1 along the length direction of the cutter groove 11, a nail pushing block 5 which is used for jacking the nail pushing particles 3 is slidably arranged in the sliding chute 6, the nail pushing block 5 comprises a first inclined surface 51 which is used for jacking the first nail pushing particles 31 and a second inclined surface 52 which is used for jacking the second nail pushing particles 32, the included angle between the first inclined surface 51 and the sliding chute 6 in the length direction is smaller than the included angle between the second inclined surface 52 and the sliding chute 6 in the length direction, and the maximum heights of the first inclined surface 51 and the second inclined surface 52 are the same and are distributed along the length.

Wherein, nail storehouse 1 is rectangular shape structure, the up end of nail storehouse 1 is used for hugging closely the tissue surface of treating sutural, be equipped with on nail storehouse 1 with its nail chamber 4 that runs through from top to bottom, be equipped with in the nail chamber 4 and follow the nail grain 3 that pushes away that nail chamber 4 reciprocated, push away nail grain 3 and be used for placing suturing nail 2, specifically, it is equipped with the recess that is used for placing suturing nail 2 to push away the up end on the nail grain 3, the middle part of nail storehouse 1 is equipped with sword groove 11 along its length direction, nail storehouse 1 is divided into first half 12 and lower half 13 by sword groove 11.

As shown in fig. 3, the staple cavities 4 include three rows of upper staple cavities distributed in a staggered manner in the upper half portion 12 and three rows of lower staple cavities distributed in a staggered manner in the lower half portion 13, that is, the upper half portion 12 of the staple cartridge 1 is provided with three rows of upper staple cavities, the lower half portion 13 of the staple cartridge 1 is provided with three rows of lower staple cavities, and the upper staple cavities and the lower staple cavities are symmetrically distributed with respect to the knife slot 11.

As shown in fig. 4, the staple pushing granule 3 comprises a first staple pushing granule 31 and a second staple pushing granule 32, the first staple pushing granule 31 is slidably inserted into the first row of staple cavities 41 and the second row of staple cavities 42, and the second staple pushing granule 32 is slidably inserted into the third row of staple cavities 43, so that the staple pushing granule 3 moves upwards to insert the staples 2 on the staple pushing granule 3 into the tissue to be stapled under the pushing of the staple pushing block 5. And because the first row of nail cavities 41, the second row of nail cavities 42 and the third row of nail cavities 43 are distributed in a staggered manner, the nail pushing particles 3 on the first row of nail cavities 41, the second row of nail cavities 42 and the third row of nail cavities 43 can be prevented from being sewn at the same time, and the firing force of the anastomat is reduced.

As shown in fig. 5, the staple pushing block 5 includes a first inclined surface 51 and a second inclined surface 52, the first inclined surface 51 is used for jacking the first staple pushing particle 31, the second inclined surface 52 is used for jacking the second staple pushing particle 32, that is, the staple pushing block 5 is driven by the cutting knife to slide along the chute 6 at the bottom of the staple cartridge 1, during the sliding process of the staple pushing block 5, when the first inclined surface 51 on the staple pushing block 5 slides to contact with the first staple pushing particle 31, the first staple pushing particle 31 slides relative to the first inclined surface 51, so that the first inclined surface 51 jacks up the first staple pushing particle 31, so that the first staple pushing particle 31 moves upward along the first staple cavity 41 and the second staple cavity 42 to press the staple 2 into the tissue to be sutured, and similarly, the second inclined surface 52 can jack up the second staple pushing particle 32.

As shown in fig. 6, since the first staple pushing granule 31 needs to push two rows of staples 2 at the same time, the force required for the first staple pushing granule 31 to advance is larger than that of the second staple pushing granule 32, and therefore, the included angle between the first inclined surface 51 and the length direction of the chute 6 is smaller than that between the second inclined surface 52 and the length direction of the chute 6, so as to ensure that the forward pushing force of the staple pushing block 5 is smaller when the same upward pushing force is generated. The maximum heights of the first inclined surface 51 and the second inclined surface 52 are the same and are distributed along the length direction of the chute 6 in a staggered manner, so that the time points of the maximum force required by the first staple pushing particle 31 and the second staple pushing particle 32 in the staple forming process are staggered, and the triggering force of the staple pushing block 5 for pushing the staple pushing particles 3 is reduced.

To sum up, the staple cartridge assembly of the linear stapler provided by the present invention staggers the three rows of upper staple cavities and the three rows of lower staple cavities on the upper half 12 and the lower half 13 of the staple cartridge 1, so that the maximum force exerted on the staple pushing particles 3 inserted into the staple cavities 4 is staggered, the first staple pushing particles 31 are simultaneously inserted into the first staple cavities 41 and the second staple cavities 42, the second staple pushing particles 32 are inserted into the third staple cavities 43, and the first inclined plane 51 for pushing the first staple pushing particles 31 is relatively smaller than the second inclined plane 52 for pushing the second staple pushing particles 32, so as to ensure that the forward thrust of the staple pushing block 5 is smaller under the condition of generating the same upward thrust, in addition, the peak 51 of the first inclined plane 51 on the staple pushing block 5 is staggered with the peak 52 of the second inclined plane, so that the time of the first staple pushing particles 31 and the peak of the second staple pushing particles 32 are staggered, the three rows of suturing nails 2 are prevented from reaching the highest position at the same time, so that the thrust required by the nail pushing block 5 is further reduced, the percussion force of the anastomat is reduced, and the whole suturing process is more stable.

As shown in fig. 6, on the basis of the above embodiment, preferably, the nail pushing block 5 is further provided with a third inclined surface 53 for jacking the nail pushing particles 3 at the front side of the first inclined surface 51 and the second inclined surface 52, and an included angle between the third inclined surface 53 and the length direction of the chute 6 is larger than an included angle between the second inclined surface 52 and the length direction of the chute 6. That is, in the present embodiment, the third slope 53 having a larger slope is provided on the front side of the staple pushing block 5, so that the entrance slope of the staple pushing block 5 is larger than the slope of the back side, thereby increasing the moving speed of the staple 2 in the vertical stroke and improving the efficiency of the staple, and the slope of the first slope 51 and the second slope 52 with respect to the third slope 53 is smaller, so that the pushing force required for the staple pushing block 5 when the staple 2 is pushed in can be reduced.

On the basis of the above embodiment, in order to ensure the smoothness of the sliding of the staple pushing granule 3 along the staple cavity 4, preferably, the third inclined surface 53 is smoothly connected with the first inclined surface 51 and the second inclined surface 52, and specifically, the third inclined surface 53, the first inclined surface 51 and the second inclined surface 52 may adopt an arc transition manner.

As shown in fig. 5, on the basis of the above-mentioned embodiment, in consideration of the specific arrangement of the staple pushing block 5, as a preferable mode, the staple pushing block 5 includes a first pushing plate 54 for pushing up the first staple pushing particles 31 and a second pushing plate 55 for pushing up the second staple pushing particles 32, the first inclined surface 51 is provided on the first pushing plate 54, and the second inclined surface 52 is provided on the second pushing plate 55. Accordingly, the slide groove 6 preferably includes a first slide groove 62 slidably engaged with the first push plate 54 and a second slide groove 61 slidably engaged with the second push plate 55. So that when the ejector pin 5 is driven by the cutter, the first push plate 54 slides along the first slide groove 62 and the second push plate 55 slides along the second slide groove 61, it is obvious that the first slide groove 62 should be communicated with the first row of pin chambers 41 and the second row of pin chambers 42 at the same time, and the second slide groove 61 should be communicated with the third row of pin chambers 43.

As shown in fig. 7 and 8, in order to further improve the smoothness of the movement of the staple pushing particles 3 in the staple cavity 4 based on the above-mentioned embodiments, preferably, the bottom of the first staple pushing particle 31 is provided with a fourth inclined surface 311 engaged with the first inclined surface 51, the fourth inclined surface 311 is parallel to the first inclined surface 51, the bottom of the second staple pushing particle 32 is provided with a fifth inclined surface 321 engaged with the second inclined surface 52, and the fifth inclined surface 321 is parallel to the second inclined surface 52.

As shown in fig. 4, on the basis of any of the above embodiments, considering that the first staple pushing granule 31 is inserted into the first row of staple cavities 41 and the second row of staple cavities 42 simultaneously, the staple pushing block 5 will push up the staples 2 in the first row of staple cavities 41 and the staples 2 in the second row of staple cavities 42 simultaneously when pushing the first staple pushing granule 31, and in order to further reduce the pushing force required by the staple pushing block 5, as a preference, the upper surface of the staple cartridge 1 is provided with the outwardly convex step 14 at the position of the first row of staple cavities 41.

That is, in this embodiment, by providing the step 14 protruding upward on the upper surface of the staple cartridge 1, and the step 14 is located at a side close to the knife slot 11, that is, the staple cavity 41 in the first row is located at the step 14, the staple forming deformation time points of the first row and the second row of the staples 2 can be changed through the height difference, and when the upper surface of the staple cartridge 1 is attached to the surface of the tissue to be sutured, only the step 14 protruding on the upper surface of the staple cartridge 1 can be pressed against the surface of the tissue to be sutured, so as to avoid that the entire upper surface of the staple cartridge 1 is pressed against the surface of the tissue to be sutured, which is beneficial to ensuring the suturing effect.

As shown in fig. 3, on the basis of the above-mentioned embodiment, in consideration of the specific arrangement of the first row of staple cavities 41, the second row of staple cavities 42 and the third row of staple cavities 43, it is preferable that the first row of staple cavities 41 and the third row of staple cavities 43 are aligned in parallel, and the second row of staple cavities 42 are distributed between the adjacent first row of staple cavities 41. That is, in the embodiment, the first row of staple cavities 41 and the third row of staple cavities 43 are juxtaposed, and the positions of the first row of stitching staples 2 and the second row of stitching staples 2 are staggered, specifically, the position of the second row of staple cavities 42 can be staggered by half the position of the staple cavities 4 relative to the first row of staple cavities 41, so as to reduce the pushing force required by the staple pusher 5.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The nail bin assembly of the straight line anastomat provided by the utility model is described in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (9)

1. A nail bin assembly of a linear anastomat comprises a nail bin (1), wherein a nail cavity (4) is formed in the nail bin (1), nail pushing particles (3) used for placing suturing nails (2) are arranged in the nail cavity (4) in a vertically sliding mode, the nail bin (1) is divided into an upper half portion (12) and a lower half portion (13) through a cutter slot (11), the linear anastomat is characterized in that the nail cavity (4) comprises three rows of upper nail cavities distributed in the upper half portion (12) in a staggered mode and three rows of lower nail cavities distributed in the lower half portion (13) in a staggered mode, the upper nail cavities and the lower nail cavities are symmetrically arranged relative to the cutter slot (11), and the distances between the upper nail cavities and the lower nail cavities relative to the cutter slot (11) from near to far are respectively a first row of nail cavities (41), a second row of nail cavities (42) and a third row of nail cavities (43);

the nail pushing particles (3) comprise first nail pushing particles (31) which are inserted in the first row of nail cavities (41) and the second row of nail cavities (42) and second nail pushing particles (32) which are inserted in the third row of nail cavities (43) simultaneously, a sliding groove (6) communicated with the nail cavities (4) is formed in the bottom of the nail bin (1) along the length direction of the cutter groove (11), a nail pushing block (5) used for jacking the nail pushing particles (3) is slidably arranged in the sliding groove (6), the nail pushing block (5) comprises a first inclined surface (51) used for jacking the first nail pushing particles (31) and a second inclined surface (52) used for jacking the second nail pushing particles (32), the included angle between the first inclined surface (51) and the sliding groove (6) in the length direction is smaller than the included angle between the second inclined surface (52) and the sliding groove (6), the maximum heights of the first inclined surface (51) and the second inclined surface (52) are the same, and the included angle between the first inclined surface (51) and the second inclined surface (52) in the length direction is along the sliding groove (6) The length direction is distributed in a staggered way.

2. The staple cartridge assembly of the linear stapler according to claim 1, wherein the staple pushing block (5) is further provided with a third inclined surface (53) for jacking the staple pushing particles (3) at the front side of the first inclined surface (51) and the second inclined surface (52), and an included angle between the third inclined surface (53) and the length direction of the slide slot (6) is greater than an included angle between the second inclined surface (52) and the length direction of the slide slot (6).

3. The cartridge assembly of a linear stapler according to claim 2, wherein said third ramp (53) is smoothly connected to said first ramp (51) and said second ramp (52) by a circular arc, respectively.

4. The cartridge assembly of the linear stapler according to claim 3, wherein the staple pushing block (5) comprises a first pushing plate (54) for lifting the first staple pushing granule (31) and a second pushing plate (55) for lifting the second staple pushing granule (32), the first inclined surface (51) is provided on the first pushing plate (54), and the second inclined surface (52) is provided on the second pushing plate (55).

5. The cartridge assembly of a linear stapler according to claim 4, wherein said slide groove (6) comprises a first slide groove (62) slidingly cooperating with said first push plate (54) and a second slide groove (61) slidingly cooperating with said second push plate (55).

6. The cartridge assembly of a linear stapler according to claim 1, wherein the bottom of the first staple pushing granule (31) is provided with a fourth inclined surface (311) matching with the first inclined surface (51), the fourth inclined surface (311) is parallel to the first inclined surface (51).

7. The cartridge assembly of a linear stapler according to claim 6, wherein the bottom of the second staple pushing granule (32) is provided with a fifth bevel (321) cooperating with the second bevel (52), the fifth bevel (321) being parallel to the second bevel (52).

8. The cartridge assembly of a linear stapler according to any of the claims 1 to 7, characterized in that the upper surface of the cartridge (1) is provided with an outwardly protruding step (14) at the first row of staple cavities (41).

9. The linear stapler cartridge assembly according to claim 8, wherein said first row of staple cavities (41) is aligned side-by-side with said third row of staple cavities (43), said second row of staple cavities (42) being distributed between adjacent said first row of staple cavities (41).

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