CN210077759U - Nail bin assembly for surgical instrument and surgical instrument - Google Patents

Abstract

The utility model discloses a nail bin assembly for surgical instruments, which comprises a cutting knife, a pusher and a nail bin body extending along the lengthwise direction; the nail bin body is provided with a cutter slot extending along the longitudinal direction, one part of the cutter and one part of the pusher are both positioned in the cutter slot, one part of the cutter is positioned behind one part of the pusher, and one part of the cutter is adjacent to one part of the pusher; the cutting burr includes a coupling portion for detachable coupling with a pusher member of the surgical instrument. After the cutting knife finishes cutting the tissue, the cutting knife can return to the initial position under the drive of the knife pushing piece, namely, the cutting knife is no longer positioned at the front side of the nail bin, and the cutting knife is prevented from damaging the tissue of a patient and a doctor.

Description

Nail bin assembly for surgical instrument and surgical instrument

Technical Field

The utility model relates to a surgical instrument field.

Background

The surgical instrument is a surgical tool in medical operation, and the suture instrument is one of the surgical instruments, is a device used in medicine and replaces manual suture, and has the main working principle of utilizing suture nails to perform anastomosis on tissues, similar to a stapler. The stapling instrument includes a pair of cooperating elongated jaw members that may be adapted to be inserted into a patient to staple and/or cut tissue, and that may support a cartridge. At present, current nail storehouse generally includes the nail storehouse body and sets up the suturing nail in the nail storehouse body, and the nail storehouse body is provided with a plurality of nail chamber that are used for accomodating the suturing nail. The nail bin body is provided with a knife slot extending along the longitudinal axis of the nail bin body, and the nail cavities are arranged on two sides of the knife slot along the longitudinal axis. The knife slot is used for installing a cutting knife and can move along the knife slot. The cutting knife comprises a base part and a knife edge part extending from the base part, the base part is positioned in the knife slot and moves along the knife slot, and the knife edge part is positioned above the nail bin body and is used for cutting tissues. The suturing instrument is internally provided with a cutter pushing piece, when the nail bin provided with the cutting knife is arranged in the suturing instrument, the cutter pushing piece is matched with the cutting knife, and the cutter pushing piece pushes the cutting knife to enable the cutting knife to advance in the knife slot so as to cut tissues. However, in the prior art, when the nail bin with the cutting knife is installed in the suturing instrument, the cutting knife and the cutting knife cannot be fixedly matched, and the cutting knife can only be pushed to move forwards by the cutting knife and cannot be driven to return, namely, after the cutting knife cuts the tissue, the cutting knife cannot be brought back to the initial position by the cutting knife. Because the front side of the nail bin is positioned at the front end of the opening of the jaw member (namely the end effector), the blade part of the cutting knife which cannot return is exposed at the front side of the nail bin, and the blade part easily damages tissues in the process that a doctor takes the jaw member out of a patient body, and the doctor is easily injured by the blade part when replacing the nail bin.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a nail storehouse subassembly for surgical instrument, nail storehouse subassembly include the cutting knife, and the cutting knife replies to initial position after the cutting tissue finishes.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:

a cartridge assembly for a surgical instrument comprising a cutting knife, a pusher and a cartridge body extending in a lengthwise direction; the staple cartridge body is provided with a knife slot extending along the longitudinal direction, a part of the cutting knife and a part of the pusher are both positioned in the knife slot, the part of the cutting knife is positioned behind the part of the pusher, and the part of the cutting knife is adjacent to the part of the pusher; the cutting burr includes a coupling portion for detachably coupling with a pusher member of the surgical instrument.

Further, the staple cartridge body comprises an insertion end and a tail end; in an initial state, the pusher is located at the distal end of the cartridge body, and a portion of the pusher extends beyond an end surface of the distal end of the cartridge body.

Further, the staple cartridge body comprises an insertion end and a tail end; the pusher comprises an extension part extending backwards, and at least one part of the extension part exceeds the end surface of the tail end of the nail box body in an initial state.

Furthermore, the pusher comprises a limiting block and abutting pieces positioned on two sides of the limiting block, the limiting block is positioned in the knife slot, the part of the pusher comprises the limiting block, and the abutting pieces comprise abutting parts arranged in the nail bin body and the extending parts extending backwards from the abutting parts.

Further, the bottom surface of the extension part is higher than the bottom surface of the nail bin body.

Furthermore, the number of the pushing parts is two, each pushing part comprises two pushing blocks arranged in parallel, and the extending part extends backwards from the pushing blocks.

Furthermore, each abutting part comprises a first abutting block and a second abutting block which are arranged in parallel, the first abutting block is closer to the limiting block relative to the second abutting block, and the extending part extends backwards from the first abutting block.

Further, in the initial state and after the cutter retreats, the connecting part is positioned outside the nail bin body.

Further, the cutting burr includes a base portion, a blade portion extending upwardly from the base portion, and an attachment portion extending rearwardly from the base portion, the base portion being located within the burr slot, the portion of the cutting burr including the base portion; the additional portion includes the connecting portion.

Further, the connecting portion is a first accommodating structure, and the first accommodating structure is used for accommodating a part of the cutter pushing piece.

Further, the first accommodating structure is a concave part formed by downwards sinking.

Further, the staple cartridge body comprises an insertion end and a tail end; the knife slot divides the nail bin body into a first side part and a second side part, the tail end of the nail bin body is provided with a first protruding part and a second protruding part which protrude upwards from the top surface of the nail bin body, the first protruding part is located on the first side part, and the second protruding part is located on the second side part.

Further, the push-type broach piece comprises a second accommodating structure, and the second accommodating structure is used for accommodating a part of the cutting knife.

Further, the push-type broach piece comprises a body part extending along the lengthwise direction, and a first extension part and a second extension part extending downwards from the body part; the body part is provided with a notch formed by sinking upwards from the bottom surface of the body part; and another notch is formed by upward sinking between the first extension part and the second extension part, and the another notch is the second accommodating structure.

Further, the nail cartridge assembly further comprises a stitching nail and a nail pushing piece, the nail cartridge body is provided with a stitching nail cavity, the stitching nail is contained in the stitching nail cavity, and the nail pushing piece is used for pushing the stitching nail out of the stitching nail cavity; the pusher is used for pushing the nail pushing piece.

In order to achieve the above purpose, the utility model discloses still can realize through following technical scheme:

a surgical instrument comprising a shaft assembly, an end effector disposed at one end of the shaft assembly; the shaft assembly includes the push-knife, a portion of the push-knife being located within the end effector; the surgical instrument further comprises a staple cartridge assembly for a surgical instrument according to any of the above, said staple cartridge assembly being detachably mounted to said end effector.

Further, the end effector is provided with a limiting piece, and in an initial state, the limiting piece abuts against the cutter pushing piece; the nail bin assembly applies force to the limiting piece to enable the limiting piece to be separated from the knife pushing piece.

Further, the end effector comprises a staple bin seat and a staple abutting seat which is pivotally connected with the staple bin seat, and the staple bin assembly is detachably arranged on the staple bin seat; the limiting piece is pivotally arranged on the nail bin seat.

Furthermore, the limiting part comprises a main body part, a first convex column and a second convex column, the first convex column extends from the main body part to one side in the transverse direction, the second convex column extends from the main body part to the other side in the transverse direction, the nail bin seat comprises two opposite side walls, each side wall is provided with an accommodating hole, each accommodating hole comprises a first accommodating hole and a second accommodating hole, the first convex column is pivotally arranged in the first accommodating hole, and the second convex column is pivotally arranged in the second accommodating hole.

Furthermore, the limiting member further includes a protrusion extending from the main body, and the protrusion and the first protruding pillar extend in the same direction.

Furthermore, the limiting part further comprises a torsion spring, the torsion spring is wound on the first convex column, and one end of the torsion spring abuts against the convex block.

Further, the end effector comprises a nail bin seat and a nail abutting seat which is pivotally connected with the nail bin seat; the surgical instrument further comprises an elastic sheet arranged in the nail bin seat, one end of the elastic sheet abuts against the bottom wall of the nail bin seat, and the other end of the elastic sheet abuts against the knife pushing piece.

Further, the surgical instrument further comprises a handle assembly from which the shaft assembly extends; the handle assembly comprises a transmission mechanism, the transmission mechanism is connected to the rod body assembly, and the transmission mechanism drives the rod body assembly to move forwards or backwards.

The utility model has the advantages that: after the cutting knife finishes cutting the tissue, the cutting knife can return to the initial position under the drive of the knife pushing piece, namely, the knife edge part is no longer positioned at the front side of the nail bin, and the knife edge part is prevented from damaging the tissue of a patient and a doctor.

Drawings

Fig. 1 is a schematic structural view of an end effector and a knife pushing member of the stapler according to the present invention;

FIG. 2 is an exploded perspective view of the end effector and knife pusher member of FIG. 1;

FIG. 3 is a schematic view of the staple cartridge assembly and knife pusher of FIG. 2;

FIG. 4 is an enlarged view of the circled portion shown in FIG. 3;

FIG. 5 is a schematic view of the staple cartridge assembly of FIG. 3 shown at an alternate angle to the pusher member;

FIG. 6 is an enlarged view of the circled portion shown in FIG. 5;

FIG. 7 is an exploded perspective view of the cartridge assembly and knife pusher of FIG. 3;

FIG. 8 is an enlarged view of the circled portion shown in FIG. 7;

FIG. 9 is a further exploded perspective view of the staple cartridge assembly and pusher member of FIG. 7;

FIG. 10 is an enlarged view of the circled portion shown in FIG. 9;

FIG. 11 is a schematic structural diagram of the limiting member shown in FIG. 7;

fig. 12 is a schematic structural view of the pushing member shown in fig. 9;

FIG. 13 is a schematic view of the position-limiting member shown in FIG. 3 being disengaged from the second recess of the knife pushing member;

FIG. 14 is an enlarged view of the circled portion shown in FIG. 13;

fig. 15 is a schematic structural view of the cutting blade, the limiting member and the blade pushing member shown in fig. 13.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The meaning of "a number" is at least one.

The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The utility model discloses an anastomat (not shown), it includes handle components, the pole body subassembly that extends from handle components and sets up in the end effector 100 of pole body subassembly one end. The handle component comprises a body and a transmission mechanism arranged on the body, the transmission mechanism is connected with the rod body component, and the transmission mechanism drives the rod body component to move forwards or backwards. As shown in fig. 1 to 2, the end effector 100 includes a magazine base 10 and a staple abutting base 20 pivotally connected to the magazine base 10, and the staple cartridge assembly 30 can be engaged with the magazine base 10 and removed from the magazine base 10, i.e. the staple cartridge assembly 30 is detachably mounted on the magazine base 10. The cartridge assembly 30 includes a cartridge 40 and a cutting knife 50 disposed on the cartridge 40. The shaft assembly includes a pusher member 60, a portion of the pusher member 60 being located within the end effector 100, the pusher member 60 being adapted to move the cutting blade 50 forward or backward. The magazine base 10 is further provided with a spring plate 70, one end of the spring plate 70 abuts against the bottom wall 11 of the magazine base 10, the other end of the spring plate 70 abuts against the push-type cutter 60, and the spring plate 70 provides an upward supporting force for the push-type cutter 60, so that a part of the push-type cutter 60 abuts against the nail-abutting base 20. As used herein, the terms "anterior" and "posterior" are relative to a clinician manipulating stapler 100, the term "posterior" referring to a direction closer to the clinician, the term "anterior" referring to a direction further away from the clinician; as used herein, the term "longitudinal direction" refers to the direction extending between the front and back, and the term "transverse direction" refers to the direction perpendicular to the longitudinal direction; the terms "upper" and "lower" are used herein in a relative sense, i.e., "anvil seat 20" is "upper" and "cartridge seat 10" is "lower". The term "disposed" is used throughout to denote a connection or positional relationship between two components.

As shown in fig. 3 to 12, the magazine 40 includes staples (not shown), a staple pusher (not shown), a magazine body 41 extending in the longitudinal direction, a pusher 42 attached to the magazine body 41, and a bracket 43. The cutting knife 50 is also mounted on the cartridge body 41, the cutting knife 50 is disposed adjacent to the pusher 42, and the bracket 43 is used for limiting the pusher 42 and the cutting knife 50, and preventing the pusher 42 and the cutting knife 50 from being separated from the cartridge body 41 downwards. The abutting means that the cutting knife 50 is adjacent to and abutted against the pusher 42, and the cutting knife 50 and the pusher 42 are not fixed with each other, so that the cutting knife 50 pushes the pusher 42 to advance forwards when advancing forwards, and the pusher 42 is left at the front side of the staple cartridge body 41 when the cutting knife 50 retreats. The cartridge body 41 has a plurality of staple cavities 411, the staples are arranged in the staple cavities 411, a part of the staple pusher is also arranged in the staple cavities 411 and abuts against the bottoms of the staples, when the pusher 42 moves, the pusher 42 drives the staple pusher to move upwards, and the staple pusher pushes the staples out. When magazine 40 is not in use, a cover (not shown) is attached to magazine 40 to prevent dust from entering magazine 40. The magazine body 41 is formed with a knife slot 412 along the longitudinal direction, and the knife slot 412 allows the cutting knife 50 to move inward. The cartridge body 41 comprises an insertion end 413 and a tip 414, and in an initial state, the pusher 42 is located at the tip 414 of the cartridge body 41, and when the cutting knife 50 advances forward in the knife slot 412, the cutting knife 50 pushes the pusher 42 forward, and the pusher 42 pushes the staple pusher to move upward, and the staple pusher pushes staples out from the staple cavities 411. The cutting knife 50 comprises a base part 51, a knife edge part 52 extending upwards from the base part 51 and an additional part 53 extending backwards from the base part 51, the base part 51 is positioned in the knife slot 412, the knife edge part 52 is positioned above the knife slot 412, in an initial state, the additional part 53 exceeds the rear end surface of the nail bin body 41, the additional part 53 comprises a connecting part 530, the connecting part 530 is positioned outside the nail bin body 41, and the connecting part 530 is used for being detachably connected with the knife pushing part 60; the rear end surface of the cartridge body 41 is the end surface of the tip 414 of the cartridge body 41. The connecting portion 530 is a first receiving structure for receiving a portion of the push blade 60, and the first receiving structure is a concave portion formed by recessing downward from the top surface of the additional portion 53, that is, the connecting portion 530 is a concave portion. In the initial state, the recess 530 is located outside the cartridge body 41, and the recess 530 is used for accommodating a portion of the knife pushing element 60, so that the knife pushing element 60 is connected with the cutting knife 50, and the knife pushing element 60 drives the cutting knife 50 to advance forwards or backwards in the knife slot 412. The knife slot 412 divides the cartridge body 41 into a first side portion 4151 and a second side portion 4152, the end 414 of the cartridge body 41 is provided with a first protrusion 4161 and a second protrusion 4162 protruding upward from the top surface thereof, the first protrusion 4161 is located on the first side portion 4151, the second protrusion 4162 is located on the second side portion 4152, in the initial state, the first protrusion 4161 and the second protrusion 4162 are located on both sides of the knife portion 52, and the first protrusion 4161 and the second protrusion 4162 are used for protecting the knife portion 52 in the initial state to prevent the knife portion 52 from being damaged by foreign objects, so that a doctor cannot be damaged by the knife portion 52 when the doctor is loaded into the cartridge 40. The pusher 42 includes a stop block 421 and two pushing members 422 located at two sides of the stop block 421, the stop block 421 is located in the knife slot 412, the pushing members 422 include a pushing portion 423 disposed in the magazine body 41 and an extending portion 424 extending backward from the pushing portion 423, and in an initial state, the extending portion 424 exceeds a rear end surface of the magazine body 41. The pushing portion 423 includes a first pushing block 425 and a second pushing block 426 disposed in parallel, the first pushing block 425 is closer to the limiting block 421 relative to the second pushing block 426, the extending portion 424 extends backward from the first pushing block 425, and a bottom surface of the extending portion 424 is higher than a bottom surface of the magazine body 41. The initial state is when the cartridge assembly 30 is not installed into the end effector 100. The base 51 of the cutting blade 50 and the stop 421 of the pusher 42 are both located in the blade slot 412, the base 51 is located behind the stop 421 and the base 51 abuts the stop 421, and the cutting blade 50 and the pusher 42 move along the blade slot 412. The term "beyond" is used in many instances herein to indicate that a feature is exposed from a reference surface relative to the reference surface.

The magazine base 10 is further provided with a limiting member 80 therein, the limiting member 80 is pivotally mounted on the magazine base 10, and in an initial state, the limiting member 80 abuts against the cutter pushing member 60. The limiting member 80 includes a main body 81, a first protruding column 82 extending from the main body 81 to one side in the transverse direction, and a second protruding column 83 extending from the main body to the other side in the transverse direction, the magazine base 10 includes a first side wall 12 and a second side wall 13 disposed opposite to each other, the first side wall 12 is provided with a first receiving hole 120, the second side wall 13 is provided with a second receiving hole 130, the first protruding column 82 is received in the first receiving hole 120 and can rotate in the first receiving hole 120, and the second protruding column 83 is received in the second receiving hole 130 and can rotate in the second receiving hole 130. The position-limiting member 80 further includes a protrusion 84 extending from the main body 81, and the protrusion 84 extends in the same direction as the first protrusion 82. The position-limiting member 80 further includes a torsion spring 85, the torsion spring 85 is wound around the first protrusion 82, and one end of the torsion spring is abutted against the protrusion 84. The main body 81 includes two side arms disposed in parallel and a connecting arm 86 connecting the two side arms, the two side arms are a first side arm 87 and a second side arm 88 respectively, the first convex column 82 extends from the first side arm 87, the second convex column 83 extends from the second side arm 88, and a receding groove 89 penetrating in the up-down direction is formed between the first side arm 87 and the second side arm 88.

The push broach piece 60 includes a body portion 61 extending along a longitudinal direction, and a first extension portion 62 and a second extension portion 63 extending downward from the body portion 61, a second receiving structure is formed between the first extension portion 62 and the second extension portion 63, the second receiving structure is used for receiving a part of the cutting blade 50, the second receiving structure is a first recess 611 formed by upward recessing from a bottom surface of the body portion 61 of the push broach piece 60, the first recess 611 is used for receiving a part of the additional portion 53 of the cutting blade 50, so that the connection between the push broach piece 60 and the cutting blade 50 is more stable and reliable. The push knife 60 further includes a second recess 612 formed by being recessed upward from the bottom surface of the body portion 61, and the connecting arm 86 of the retaining member 80 abuts against the second recess 612 to prevent the push knife 60 from moving forward by an external force. The second extending portion 63 is located between the first recess 611 and the second recess 612, and the second extending portion 63 is disposed through the avoiding groove 89.

Referring to fig. 13 and 15, when the magazine assembly 30 is used, the cover of the magazine 40 is removed, the magazine assembly 30 is pressed down and installed into the magazine base 10, and the retainer 80 is forced by the magazine assembly 30 to be separated from the knife pushing member 60. When the magazine assembly 30 is installed in the magazine base 10, the extending portion 424 of the pusher 42 abuts against the side arm of the main body 81 of the retainer 80 to press the main body 81 of the retainer 80 downward, so that the main body 81 of the retainer 80 is separated from the main body 61 of the pusher 60, and at this time, the pusher 60 can move forward under the action of external force. When the anvil 20 pivots to close the end effector 100, the first extension 62 of the pusher member 60 moves downward under the action of the anvil 20 and into the recess 530 of the attachment portion 53 of the cutting blade 50. When the push blade 60 moves forward, the push blade 60 drives the cutting blade 50 to move forward. When the cutting knife 50 moves from the end 414 of the cartridge body 41 to the insertion end 413 of the cartridge body 41, the cutting of the tissue is completed. At this time, the pusher element 60 has to be retracted from the insertion end 413 of the cartridge body 41 to the distal end 414 of the cartridge body 41, and during the retraction process, the pusher element 60 brings the cutting knife 50 back to the distal end 414 of the cartridge body 41 as well, since the first extension 62 of the pusher element 60 is located in the recess 530 of the additional portion 53 of the cutting knife 50. When the cutting blade 50 is returned to the distal end 414 of the cartridge body 41 (i.e., retreating), the anvil 20 pivots to open the end effector 100, and the first extension 62 of the pusher member 60 moves upward under the action of the spring 70 and disengages from the recess 530 of the attachment portion 53 of the cutting blade 50. The cutting blade 50 and the push blade member 60 can be connected or separated, and can be detachably connected. When the cartridge assembly 30 is removed from the cartridge holder 10, the extending portion 424 of the pusher 42 no longer abuts against the side arm of the main body 81 of the retainer 80, and the retainer 80 pivots to make the connecting arm 86 abut against the second notch 612 of the main body 61 of the pusher 60, at this time, the pusher 60 cannot move forward under the action of external force.

When the cutting knife 50 is returned to the distal end 414 of the cartridge body 41, the knife edge portion 52 is no longer located at the front side of the cartridge 40, the front end of the opening when the end effector 100 is expanded, reducing the risk of the knife edge portion 52 damaging the patient tissue and the surgeon. To further enhance the protection effect, when the cutting blade 50 is returned to the distal end 414 of the cartridge body 41, the blade portion 52 is located between the first protrusion 4161 and the second protrusion 4162, so that the blade portion 52 will not damage the tissue during the removal of the end effector 100 from the patient, and the blade portion 52 will not be damaged when the surgeon removes the cartridge 40.

In summary, the pusher 42 has an extension 424, in an initial state, the extension 424 exceeds the rear end surface of the cartridge body 41, when the cartridge assembly 30 is installed in the cartridge seat 10, the extension 424 enables the stopper 80 to disengage from the knife pushing element 60, so that the knife pushing element 60 can move forward under the action of external force, and the knife pushing element 60 is engaged with the cutting knife 50 of the cartridge assembly 30, so that the cutting knife 50 smoothly moves forward in the knife slot 412 under the driving of the knife pushing element 60, thereby achieving the purpose of cutting tissue; on the other hand, after the cutting blade 50 has cut the tissue, the cutting blade 50 can be smoothly returned to the initial position by the driving of the pusher element 60, and the blade portion 52 is prevented from being located at the front side of the magazine 40 and the front end of the opening when the end effector 100 is opened. Further, the knife edge portion 52 is located between the first protrusion 4161 and the second protrusion 4162, and the first protrusion 4161 and the second protrusion 4162 are used for shielding the knife edge portion 52 after the tissue is cut and retreated to prevent the knife edge portion 52 from damaging the tissue of the patient, and the doctor will not be damaged by the knife edge portion 52 when taking out the nail bin 40.

Although the embodiment of the present invention has been shown and described, it is understood that the above embodiment is illustrative and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and variations to the above embodiment within the scope of the present invention, and all such changes, modifications, substitutions and variations are within the scope of the present invention.

Claims (27)

1. A cartridge assembly for a surgical instrument comprising a cutting knife, a pusher and a cartridge body extending in a lengthwise direction; the staple cartridge body is provided with a knife slot extending along the longitudinal direction, a part of the cutting knife and a part of the pusher are both positioned in the knife slot, the part of the cutting knife is positioned behind the part of the pusher, and the part of the cutting knife is adjacent to the part of the pusher; the method is characterized in that: the cutting burr includes a coupling portion for detachably coupling with a pusher member of the surgical instrument.

2. The staple cartridge assembly for a surgical instrument of claim 1, wherein: the staple cartridge body comprises an insertion end and a tail end; in an initial state, the pusher is located at the distal end of the cartridge body, and a portion of the pusher extends beyond an end surface of the distal end of the cartridge body.

3. The staple cartridge assembly for a surgical instrument of claim 2, wherein: the pusher comprises an extension part extending backwards, and at least one part of the extension part exceeds the end surface of the tail end of the nail box body in an initial state.

4. The staple cartridge assembly for a surgical instrument of claim 3, wherein: the pusher comprises a limiting block and abutting parts positioned on two sides of the limiting block, the limiting block is positioned in the knife slot, the part of the pusher comprises the limiting block, and the abutting parts comprise abutting parts arranged in the nail bin body and extending parts extending backwards from the abutting parts.

5. The staple cartridge assembly for a surgical instrument of claim 1, wherein: the staple cartridge body comprises an insertion end and a tail end; the pusher comprises an extension part extending backwards, and at least one part of the extension part exceeds the end surface of the tail end of the nail box body in an initial state.

6. The staple cartridge assembly for a surgical instrument of claim 5, wherein: the pusher comprises a limiting block and abutting parts positioned on two sides of the limiting block, the limiting block is positioned in the knife slot, the part of the pusher comprises the limiting block, and the abutting parts comprise abutting parts arranged in the nail bin body and extending parts extending backwards from the abutting parts.

7. The staple cartridge assembly for a surgical instrument of any one of claims 3, 4, 5, 6, wherein: the bottom surface of the extension part is higher than the bottom surface of the nail bin body.

8. The staple cartridge assembly for a surgical instrument of claim 4 or 6, wherein: the number of the pushing parts is two, each pushing part comprises two pushing blocks which are arranged in parallel, and the extending parts extend backwards from the pushing blocks.

9. The staple cartridge assembly for a surgical instrument of claim 8, wherein: each abutting portion comprises a first abutting block and a second abutting block which are arranged in parallel, the first abutting block is closer to the limiting block relative to the second abutting block, and the extending portion extends backwards from the first abutting block.

10. The staple cartridge assembly for a surgical instrument of claim 1, wherein: and in the initial state and after the cutter retreats, the connecting part is positioned outside the nail bin body.

11. The staple cartridge assembly for a surgical instrument of any one of claims 1, 10, wherein: the cutting burr comprising a base portion, a blade portion extending upwardly from the base portion, and an attachment portion extending rearwardly from the base portion, the base portion being located within the knife slot, the portion of the cutting burr comprising the base portion; the additional portion includes the connecting portion.

12. The staple cartridge assembly for a surgical instrument of any one of claims 1, 10, wherein: the connecting part is a first accommodating structure which is used for accommodating a part of the cutter pushing piece.

13. The staple cartridge assembly for a surgical instrument of claim 11, wherein: the connecting part is a first accommodating structure which is used for accommodating a part of the cutter pushing piece.

14. The staple cartridge assembly for a surgical instrument of claim 12, wherein: the first accommodating structure is a concave part formed by downwards sinking.

15. The staple cartridge assembly for a surgical instrument of claim 13, wherein: the first accommodating structure is a concave part formed by downwards sinking.

16. The staple cartridge assembly for a surgical instrument of claim 1, wherein: the staple cartridge body comprises an insertion end and a tail end; the knife slot divides the nail bin body into a first side part and a second side part, the tail end of the nail bin body is provided with a first protruding part and a second protruding part which protrude upwards from the top surface of the nail bin body, the first protruding part is located on the first side part, and the second protruding part is located on the second side part.

17. The staple cartridge assembly for a surgical instrument of claim 1, wherein: the push broach piece comprises a second containing structure, and the second containing structure is used for containing a part of the cutting knife.

18. The staple cartridge assembly for a surgical instrument of claim 17, wherein: the push-type broach piece comprises a body part extending along the lengthwise direction, and a first extending part and a second extending part extending downwards from the body part; the body part is provided with a notch formed by sinking upwards from the bottom surface of the body part; and another notch is formed by upward sinking between the first extension part and the second extension part, and the another notch is the second accommodating structure.

19. The staple cartridge assembly for a surgical instrument of claim 1, wherein: the nail cartridge assembly further comprises a suturing nail and a nail pushing piece, the nail cartridge body is provided with a nail sewing cavity, the suturing nail is contained in the nail sewing cavity, and the nail pushing piece is used for pushing the suturing nail out of the nail sewing cavity; the pusher is used for pushing the nail pushing piece.

20. A surgical instrument comprising a shaft assembly, an end effector disposed at one end of the shaft assembly; the shaft assembly includes a push-knife, a portion of the push-knife being located within the end effector; the method is characterized in that: the surgical instrument further comprising a staple cartridge assembly for a surgical instrument according to any one of claims 1-19, said staple cartridge assembly being removably mounted to said end effector.

21. The surgical instrument of claim 20, wherein: the end effector is provided with a limiting piece, and the limiting piece abuts against the cutter pushing piece in an initial state; the nail bin assembly applies force to the limiting piece to enable the limiting piece to be separated from the knife pushing piece.

22. The surgical instrument of claim 21, wherein: the end effector comprises a nail bin seat and a nail abutting seat which is pivotally connected to the nail bin seat, and the nail bin assembly is detachably arranged on the nail bin seat; the limiting piece is pivotally arranged on the nail bin seat.

23. The surgical instrument of claim 22, wherein: the limiting part comprises a main body part, a first convex column and a second convex column, the first convex column extends from the main body part to one side in the transverse direction, the second convex column extends from the main body part to the other side in the transverse direction, the nail bin seat comprises two opposite side walls, each side wall is provided with an accommodating hole, each accommodating hole comprises a first accommodating hole and a second accommodating hole, the first convex column is pivotally arranged in the first accommodating hole, and the second convex column is pivotally arranged in the second accommodating hole.

24. The surgical instrument of claim 23, wherein: the limiting part further comprises a lug extending from the main body part, and the lug and the first convex column extend in the same direction.

25. The surgical instrument of claim 24, wherein: the limiting part further comprises a torsion spring, the torsion spring is wound on the first convex column, and one end of the torsion spring abuts against the convex block.

26. The surgical instrument of claim 20, wherein: the end effector comprises a nail bin seat and a nail abutting seat which is pivotally connected with the nail bin seat; the surgical instrument further comprises an elastic sheet arranged in the nail bin seat, one end of the elastic sheet abuts against the bottom wall of the nail bin seat, and the other end of the elastic sheet abuts against the knife pushing piece.

27. The surgical instrument of claim 20, wherein: the surgical instrument further comprises a handle assembly from which the shaft assembly extends; the handle assembly comprises a transmission mechanism, the transmission mechanism is connected to the rod body assembly, and the transmission mechanism drives the rod body assembly to move forwards or backwards.

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