Staple cartridge assembly for a surgical instrument and surgical instrument

Abstract

The application discloses a kind of staple cartridge assemblies for surgical instruments, including cutting knife, pusher and staple cartridge body extending in length direction;Staple cartridge body is provided with the knife slot extending in the length direction, and the part of cutting knife and the part of pusher are located in the knife slot, the part of cutting knife is located behind the part of pusher, and the part of cutting knife is adjacent to the part of pusher;Cutting knife includes connecting portion, and connecting portion is used to be separably connected with the pusher of surgical instrument.Just after cutting knife cuts tissue, cutting knife can be restored to initial position under the drive of pusher, that is, cutting knife is no longer located in the front side of staple cartridge, prevent cutting knife from damaging patient tissue and doctor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of surgical instruments. BACKGROUND

[0002] Surgical instruments are surgical tools in medical operations, and stapling instruments are one kind of surgical instruments, which are devices used in medicine to replace manual suturing, and the main working principle is to use staples to anastomose tissues, similar to a stapler. The stapling instrument includes a pair of cooperating elongated jaw members, which can be adapted to be inserted into a patient's body to staple and / or cut tissue, and the jaw members can support a cartridge. At present, the existing cartridge generally includes a cartridge body and staples arranged in the cartridge body, and the cartridge body is provided with a plurality of staple cavities for accommodating the staples. The cartridge body is provided with a knife slot extending along the longitudinal axis of the cartridge body, and the staple cavities are arranged on both sides of the knife slot along the longitudinal axis. The knife slot is provided for mounting a cutting knife therein and the cutting knife can move along the knife slot. The cutting knife includes a base and a blade portion extending from the base, the base is located in the knife slot and moves along the knife slot, and the blade portion is located above the cartridge body and is used to cut tissue. The stapling instrument is provided with a knife pusher, when the cartridge with the cutting knife is installed in the stapling instrument, the knife pusher cooperates with the cutting knife, and the knife pusher pushes the cutting knife to move in the knife slot to cut tissue. However, in the prior art, when the cartridge with the cutting knife is installed in the stapling instrument, the knife pusher and the cutting knife cannot be fixedly matched, and the knife pusher can only push the cutting knife to move forward and cannot drive the cutting knife to retreat, that is, when the cutting knife finishes cutting the tissue, the knife pusher cannot bring the cutting knife back to the initial position. Since the front side of the cartridge is located at the front end of the opening of the jaw member (i.e. the end effector), the blade portion of the cutting knife that cannot retreat is exposed to the front side of the cartridge, and the blade portion is easy to damage the tissue during the process of the doctor taking the jaw member out of the patient's body, and the doctor is also easy to be injured by the blade portion when replacing the cartridge. SUMMARY

[0003] The purpose of the present application is to provide a cartridge assembly for a surgical instrument, which includes a cutting knife that returns to the initial position after cutting tissue.

[0004] In order to achieve the above purpose, the present application realizes the following technical scheme:

[0005] A cartridge assembly for a surgical instrument, which includes a cutting knife, a pusher and a cartridge body extending in a longitudinal direction; the cartridge body is provided with a knife slot extending along the longitudinal direction, and a part of the cutting knife and a part of the pusher are located in the knife slot, the part of the cutting knife is located behind the part of the pusher, and the part of the cutting knife abuts the part of the pusher; the cutting knife includes a connecting portion for being detachably connected with a knife pusher of the surgical instrument.

[0006] Further, the cartridge body comprises an insertion end and a distal end; in the initial state, the pusher is located at the distal end of the cartridge body, and a part of the pusher protrudes beyond the end face of the distal end of the cartridge body.

[0007] Further, the cartridge body comprises an insertion end and a distal end; the pusher comprises an extension portion extending rearward, and at least a part of the extension portion protrudes beyond the end face of the distal end of the cartridge body in the initial state.

[0008] Further, the pusher comprises a limiting block and push members located on both sides of the limiting block, the limiting block is located in the knife slot, the part of the pusher comprises the limiting block, and the push member comprises a push portion arranged in the cartridge body and the extension portion extending rearward from the push portion.

[0009] Further, the bottom surface of the extension portion is higher than the bottom surface of the cartridge body.

[0010] Further, the push portion is two, each of the push portions comprises two push blocks arranged in parallel, and the extension portion extends rearward from the push blocks.

[0011] Further, each of the push portions comprises first and second push blocks arranged in parallel, the first push block is closer to the limiting block than the second push block, and the extension portion extends rearward from the first push block.

[0012] Further, in the initial state and after the cutting knife is retracted, the connecting portion is located outside the cartridge body.

[0013] Further, the cutting knife comprises a base portion, a blade portion extending upward from the base portion, and an additional portion extending rearward from the base portion, the base portion is located in the knife slot, and the part of the cutting knife comprises the base portion; the additional portion comprises the connecting portion.

[0014] Further, the connecting portion is a first accommodating structure, and the first accommodating structure is used for accommodating a part of the push knife member.

[0015] Further, the first accommodating structure is a recess formed by being recessed downward.

[0016] Further, the cartridge body comprises an insertion end and a distal end; the knife slot divides the cartridge body into a first side portion and a second side portion, the distal end of the cartridge body is provided with first and second protruding portions protruding upward from the top surface of the cartridge body, the first protruding portion is located at the first side portion, and the second protruding portion is located at the second side portion.

[0017] Further, the pusher knife comprises a second accommodating structure for accommodating a part of the cutting knife.

[0018] Further, the pusher knife comprises a body part extending along the longitudinal direction and a first extension part and a second extension part extending downward from the body part; the body part is provided with a notch recessed upward from the bottom surface thereof; another notch recessed upward is formed between the first extension part and the second extension part, and the another notch is the second accommodating structure.

[0019] Further, the cartridge assembly further comprises a staple and a pusher, the cartridge body is provided with a staple cavity, the staple is accommodated in the staple cavity, the pusher is used for pushing the staple out of the staple cavity; the pusher is used for pushing the pusher.

[0020] In order to achieve the above purpose, the present application can also be realized by the following technical solutions:

[0021] A surgical instrument, comprising a shaft assembly, an end effector provided at one end of the shaft assembly; the shaft assembly comprises the pusher knife, a part of the pusher knife is located in the end effector; the surgical instrument further comprises the cartridge assembly for surgical instrument according to any one of the above, the cartridge assembly is detachably mounted on the end effector.

[0022] Further, the end effector is provided with a limiting piece, in the initial state, the limiting piece abuts against the pusher knife; the cartridge assembly exerts force on the limiting piece to make it separate from the pusher knife.

[0023] Further, the end effector comprises a cartridge seat and a staple abutting seat pivotally connected to the cartridge seat, the cartridge assembly is detachably mounted on the cartridge seat; the limiting piece is pivotally mounted on the cartridge seat.

[0024] Further, the limiting piece comprises a main body part, a first protruding column extending to one side along the transverse direction from the main body part and a second protruding column extending to the other side along the transverse direction from the main body part, the cartridge seat comprises two side walls oppositely arranged, each of the side walls is respectively provided with a receiving hole, the receiving hole comprises a first receiving hole and a second receiving hole, the first protruding column is pivotally mounted on the first receiving hole, and the second protruding column is pivotally mounted on the second receiving hole.

[0025] Further, the limiting piece further comprises a protruding block extending from the main body part, the protruding block extends in the same direction as the first protruding column.

[0026] Further, the limiting piece further comprises a torsional spring, the torsional spring is arranged around the first protruding column and one end of the torsional spring abuts against the protruding block.

[0027] Further, the end effector comprises a staple cartridge seat and a staple abutting seat pivotally connected to the staple cartridge seat; the surgical instrument further comprises a spring installed in the staple cartridge seat, one end of the spring abutting against a bottom wall of the staple cartridge seat, and the other end of the spring abutting against the push knife.

[0028] Further, the surgical instrument further comprises a handle assembly, and the shank assembly extends from the handle assembly; the handle assembly comprises a transmission mechanism connected to the shank assembly, and the transmission mechanism drives the shank assembly to move forward or backward.

[0029] The present application has the beneficial effect that after the cutting knife cuts the tissue, the cutting knife can return to the initial position under the driving of the push knife, i.e., the blade part is no longer located at the front side of the staple cartridge, preventing the blade part from damaging the patient tissue and the doctor. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic view of an end effector and a push knife of the anastomat of the present application;

[0031] Figure 2 is Figure 1 is an exploded view of the end effector and the push knife shown in the figure;

[0032] Figure 3 is Figure 2 is a structural schematic view of a staple cartridge assembly and a push knife shown in the figure;

[0033] Figure 4 is Figure 3 is an enlarged view of the circled part shown in the figure;

[0034] Figure 5 is Figure 3 is a structural schematic view of the staple cartridge assembly and the push knife from another angle shown in the figure;

[0035] Figure 6 is Figure 5 is an enlarged view of the circled part shown in the figure;

[0036] Figure 7 is Figure 3 is an exploded view of the staple cartridge assembly and the push knife shown in the figure;

[0037] Figure 8 is Figure 7 is an enlarged view of the circled part shown in the figure;

[0038] Figure 9 is Figure 7 is a further exploded view of the staple cartridge assembly and the push knife shown in the figure;

[0039] Figure 10 isFigure 9 an enlarged view of the circled part shown in (a) of Fig. 1;

[0040] Figure 11 is Figure 7 a structural schematic view of the limiting member shown in (a) of Fig. 2;

[0041] Figure 12 is Figure 9 a structural schematic view of the pushing member shown in (a) of Fig. 3;

[0042] Figure 13 is Figure 3 a structural schematic view of the limiting member when it is disengaged from the second notch of the pushing member shown in (a) of Fig. 4;

[0043] Figure 14 is Figure 13 an enlarged view of the circled part shown in (a) of Fig. 5;

[0044] Figure 15 is Figure 13 a structural schematic view of the cutting knife, the limiting member and the pushing member shown in (a) of Fig. 6. DETAILED DESCRIPTION

[0045] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the embodiments given are by way of illustration only and

[0046] The terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" are used only to describe the features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third", "fourth", "fifth", "sixth", "seventh" and "eighth" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited. The meaning of "several" is at least one.

[0047] The embodiments described below with reference to the attached drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0048] The present application discloses an anastomat (not shown), which comprises a handle assembly, a shaft assembly extending from the handle assembly, and an end effector 100 provided at one end of the shaft assembly. The handle assembly comprises a body and a transmission mechanism mounted on the body, the transmission mechanism is connected to the shaft assembly, and the transmission mechanism drives the shaft assembly to move forward or backward. As shown in Figures 1-2As shown, the end effector 100 includes a cartridge seat 10 and a buttress seat 20 pivotally connected to the cartridge seat 10, a cartridge assembly 30 is engageable within the cartridge seat 10 and removable from the cartridge seat 10, i.e., the cartridge assembly 30 is detachably mounted to the cartridge seat 10. The cartridge assembly 30 includes a cartridge 40 and a cutting knife 50 disposed in the cartridge 40. The shaft assembly includes a knife pusher 60, a portion of the knife pusher 60 is located within the end effector 100, the knife pusher 60 is used to move the cutting knife 50 forward or backward. A spring 70 is also mounted in the cartridge seat 10, one end of the spring 70 abuts against a bottom wall 11 of the cartridge seat 10, the other end of the spring 70 abuts against the knife pusher 60, the spring 70 has an upward supporting force on the knife pusher 60, so that a portion of the knife pusher 60 abuts upward against the buttress seat 20. The terms "front", "rear" used herein are relative to a clinician who operates the stapler 100, the term "rear" refers to a direction close to the clinician, the term "front" refers to a direction away from the clinician; the term "longitudinal direction" used herein refers to an extension direction between front and rear, the term "transverse direction" refers to a direction perpendicular to the longitudinal direction; the terms "upper" and "lower" used herein are relative, i.e., the "buttress seat 20" is "upper", the "cartridge seat 10" is "lower". The term "disposed" is used many times in this document, "disposed" represents a connection relationship or a positional relationship between two components.

[0049] In combination Figures 3-12As shown, the cartridge 40 comprises staples (not shown), pushers (not shown), a cartridge body 41 extending in the longitudinal direction, a pusher 42 mounted on the cartridge body 41, and a bracket 43. A cutting knife 50 is also mounted on the cartridge body 41, and the cutting knife 50 is arranged adjacent to the pusher 42, and the bracket 43 is used to define the pusher 42 and the cutting knife 50, and prevent the pusher 42 and the cutting knife 50 from being separated downward from the cartridge body 41. Adjacent means that the cutting knife 50 is adjacent to and abuts against the pusher 42, and is not fixed with each other. In this way, when the cutting knife 50 advances forward, the pusher 42 is pushed to advance forward, and when the cutting knife 50 retreats, the pusher 42 will remain on the front side of the cartridge body 41. The cartridge body 41 has a plurality of staple cavities 411, and the staples are arranged in the staple cavities 411. A part of the pushers is also arranged in the staple cavities 411 and abuts against the bottom of the staples. When the pusher 42 moves, the pusher 42 drives the pushers to move upward, and the pushers push the staples out of the staple cavities 411. When the cartridge 40 is not used, a cover (not shown) is arranged on the cartridge 40, so as to prevent dust and the like from entering the cartridge 40. The cartridge body 41 is provided with a knife slot 412 extending in the longitudinal direction, and the knife slot 412 is used for the cutting knife 50 to advance in the knife slot 412. The cartridge body 41 comprises an insertion end 413 and a terminal end 414. In the initial state, the pusher 42 is located at the terminal end 414 of the cartridge body 41. When the cutting knife 50 advances forward in the knife slot 412, the cutting knife 50 pushes the pusher 42 to advance forward, the pusher 42 pushes the pushers to move upward, and the pushers push the staples out of the staple cavities 411. The cutting knife 50 comprises a base 51, a blade portion 52 extending upward from the base 51, and an additional portion 53 extending rearward from the base 51. The base 51 is located in the knife slot 412, and the blade portion 52 is located above the knife slot 412. In the initial state, the additional portion 53 exceeds the rear end surface of the cartridge body 41. The additional portion 53 comprises a connecting portion 530 located outside the cartridge body 41, and the connecting portion 530 is used for being detachably connected with a push-knife piece 60. The rear end surface of the cartridge body 41 is the end surface of the terminal end 414 of the cartridge body 41. The connecting portion 530 is a first accommodating structure used for accommodating a part of the push-knife piece 60. The first accommodating structure is a recess formed by being recessed downward from the top surface of the additional portion 53, that is, the connecting portion 530 is a recess. In the initial state, the recess 530 is located outside the cartridge body 41, and the recess 530 is used for accommodating a part of the push-knife piece 60, so as to connect the push-knife piece 60 with the cutting knife 50, and drive the cutting knife 50 to advance forward or backward in the knife slot 412.The knife slot 412 separates the staple cartridge body 41 into a first side 4151 and a second side 4152. The end 414 of the staple cartridge body 41 has a first protrusion 4161 and a second protrusion 4162 protruding upwardly from a top surface thereof, the first protrusion 4161 being on the first side 4151 and the second protrusion 4162 being on the second side 4152. In the initial state, the first protrusion 4161 and the second protrusion 4162 are on both sides of the knife blade 52. The first protrusion 4161 and the second protrusion 4162 protect the knife blade 52 in the initial state from being damaged by foreign objects and also protect a surgeon from being injured by the knife blade 52 when loading the staple cartridge 40. The pusher 42 includes a stop block 421 and two push members 422 on both sides of the stop block 421. The stop block 421 is in the knife slot 412. The push member 422 includes a push portion 423 disposed in the staple cartridge body 41 and an extension portion 424 extending rearwardly from the push portion 423. In the initial state, the extension portion 424 extends beyond a rear end surface of the staple cartridge body 41. The push portion 423 includes a first push block 425 and a second push block 426 disposed in parallel. The first push block 425 is closer to the stop block 421 than the second push block 426. The extension portion 424 extends rearwardly from the first push block 425. A bottom surface of the extension portion 424 is higher than a bottom surface of the staple cartridge body 41. The initial state is when the staple cartridge assembly 30 is not installed in the end effector 100. The base 51 of the cutting knife 50 and the stop block 421 of the pusher 42 are both in the knife slot 412. The base 51 is rearwardly of the stop block 421 and abuts the stop block 421. The cutting knife 50 and the pusher 42 move along the knife slot 412. The term "extends beyond" is used several times in this document. "Extends beyond" means that a component protrudes out of a reference surface with respect to the reference surface.

[0050] The limiting piece 80 is pivotally installed in the cartridge seat 10 and abuts against the push-knife piece 60 in the initial state. The limiting piece 80 comprises a main body 81, a first protruding column 82 extending to one side of the main body 81 in the transverse direction, and a second protruding column 83 extending to the other side of the main body 81 in the transverse direction. The cartridge seat 10 comprises a first side wall 12 and a second side wall 13 oppositely arranged, the first side wall 12 is provided with a first receiving hole 120, and 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 limiting piece 80 further comprises a protruding block 84 extending from the main body 81, and the protruding block 84 extends in the same direction as the first protruding column 82. The limiting piece 80 further comprises a torsion spring 85, which is arranged around the first protruding column 82 and one end of which abuts against the protruding block 84. The main body 81 comprises two side arms arranged 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 protruding column 82 extends from the first side arm 87, and the second protruding column 83 extends from the second side arm 88. A gap 89 passing through in the up-down direction is formed between the first side arm 87 and the second side arm 88.

[0051] The push-knife piece 60 comprises a body 61 extending in the longitudinal direction, a first extension 62 and a second extension 63 extending downward from the body 61. The second accommodation structure for accommodating a part of the cutting knife 50 is formed between the first extension 62 and the second extension 63. The second accommodation structure is a first notch 611 formed by recessing upward from the bottom surface of the body 61 of the push-knife piece 60. The first notch 611 is used to accommodate a part of the additional part 53 of the cutting knife 50, so that the connection between the push-knife piece 60 and the cutting knife 50 is more stable and reliable. The push-knife piece 60 further comprises a second notch 612 formed by recessing upward from the bottom surface of the body 61. The connecting arm 86 of the limiting piece 80 abuts against the second notch 612 to prevent the push-knife piece 60 from moving forward under the action of external force. The second extension 63 is located between the first notch 611 and the second notch 612, and the second extension 63 penetrates the gap 89.

[0052] In combination Figure 13 And Figure 15As shown, in use of the staple cartridge assembly 30, first, the cover on the staple cartridge 40 is removed, and then the staple cartridge assembly 30 is pressed and loaded into the staple cartridge seat 10, and the staple cartridge assembly 30 exerts a force on the limiting member 80 to make the limiting member 80 disengage from the pusher knife 60. When the staple cartridge assembly 30 is loaded into the staple cartridge seat 10, the extension 424 of the pusher 42 abuts against the side arm of the main body 81 of the limiting member 80, thereby pressing downward the main body 81 of the limiting member 80, so that the main body 81 of the limiting member 80 disengages from the main body 61 of the pusher knife 60. At this time, the pusher knife 60 can move forward under the action of an external force. When the anvil 20 is pivoted and the end effector 100 is closed, the first extension 62 of the pusher knife 60 moves downward under the action of the anvil 20 and enters the recess 530 of the additional part 53 of the cutting knife 50. When the pusher knife 60 moves forward, the pusher knife 60 drives the cutting knife 50 to move forward. When the cutting knife 50 is moved from the end 414 of the staple cartridge body 41 to the insertion end 413 of the staple cartridge body 41, the cutting of the tissue is completed. At this time, the pusher knife 60 needs to be withdrawn from the insertion end 413 of the staple cartridge body 41 to the end 414 of the staple cartridge body 41. During the withdrawal process, since the first extension 62 of the pusher knife 60 is located in the recess 530 of the additional part 53 of the cutting knife 50, the pusher knife 60 also brings the cutting knife 50 back to the end 414 of the staple cartridge body 41. When the cutting knife 50 returns to the end 414 of the staple cartridge body 41 (i.e., the knife is withdrawn), the anvil 20 is pivoted and the end effector 100 is opened, and the first extension 62 of the pusher knife 60 moves upward under the action of the spring 70 and disengages from the recess 530 of the additional part 53 of the cutting knife 50. The connection between the cutting knife 50 and the pusher knife 60 can be connected or disconnected, and is disconnectably connected. When the staple cartridge assembly 30 is taken out of the staple cartridge seat 10, the extension 424 of the pusher 42 no longer abuts against the side arm of the main body 81 of the limiting member 80, and the limiting member 80 is pivoted so that the connecting arm 86 abuts against the second notch 612 of the main body 61 of the pusher knife 60. At this time, the pusher knife 60 cannot move forward under the action of an external force.

[0053] When the cutting knife 50 returns to the end 414 of the staple cartridge body 41, the blade part 52 is no longer located at the front side of the staple cartridge 40 and the front end of the opening of the end effector 100 when the end effector 100 is opened, thereby reducing the risk of the blade part 52 damaging the tissue of the patient and the doctor. In order to further enhance the protection effect, when the cutting knife 50 returns to the end 414 of the staple cartridge body 41, the blade part 52 is located between the first protrusion 4161 and the second protrusion 4162. During the process in which the doctor takes out the end effector 100 from the patient's body, the blade part 52 will not damage the tissue, and the doctor will not be injured by the blade part 52 when taking out the staple cartridge 40.

[0054] In summary, the pusher 42 has an extension 424 which exceeds the rear end surface of the cartridge body 41 in the initial state, and when the cartridge assembly 30 is installed into the cartridge seat 10, the extension 424 causes the limiting member 80 to disengage the pusher 60, so that the pusher 60 can move forward under the action of an external force, and the pusher 60 cooperates with the cutting knife 50 of the cartridge assembly 30, so that the cutting knife 50 is driven by the pusher 60 to smoothly move forward in the knife slot 412 to achieve the purpose of cutting tissue. On the other hand, after the cutting knife 50 cuts the tissue, the cutting knife 50 is driven by the pusher 60 to smoothly return to the starting position, so that the blade portion 52 is not located at the front side of the cartridge 40, and the front end of the opening of the open end effector 100 when it is opened. Further, the blade portion 52 is located between the first protruding portion 4161 and the second protruding portion 4162, which are used to shield the blade portion 52 after cutting the tissue to prevent the blade portion 52 from damaging the patient's tissue, and the doctor will not be injured by the blade portion 52 when removing the cartridge 40.

[0055] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application, and the technical solutions after the changes, modifications, replacements and variations are within the protection scope of the present application.

Claims

1. A staple cartridge assembly for a surgical instrument, the surgical instrument further comprising an end effector, the end effector comprising a staple cartridge seat and an anvil pivotally connected to the staple cartridge seat, the staple cartridge assembly being detachably mounted on the staple cartridge seat, the staple cartridge assembly comprising a cutting blade, a pusher, and a staple cartridge body extending in a longitudinal direction; the staple cartridge body being provided with a knife slot extending in the longitudinal direction, a portion of the cutting blade and a portion of the pusher being both located in the knife slot, the portion of the cutting blade being located behind the portion of the pusher, and the portion of the cutting blade being adjacent to the portion of the pusher; characterized in that: The cutting knife includes a connecting portion for detachably connecting to the pusher member of the surgical instrument; the pusher member includes a main body and a first extending portion extending downward from the main body; the cutting knife includes a base, a blade extending upward from the base, and an additional portion extending rearward from the base, the additional portion including the connecting portion, and the connecting portion is a recessed portion; When the nail magazine assembly is installed on the nail magazine seat, in response to the nail support pivoting to close the end actuator, the first extension portion of the pusher member moves downward under the action of the nail support and enters the recess of the additional portion of the cutting knife.

2. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The nail magazine body includes an insertion end and an end; the pusher includes an extension portion extending backward; in an initial state, the pusher is located at the end of the nail magazine body, and at least a portion of the extension portion exceeds the end surface of the end of the nail magazine body.

3. The staple cartridge assembly for a surgical instrument according to claim 2, wherein: The pusher includes a limit block and push members located on both sides of the limit block, the limit block is located in the knife slot, the part of the pusher includes the limit block, and the push member includes a push portion arranged in the nail magazine body and the extension portion extending backward from the push portion.

4. The staple cartridge assembly for a surgical instrument according to any one of claims 2 and 3, wherein: The bottom surface of the extension portion is higher than the bottom surface of the nail magazine body.

5. The staple cartridge assembly for a surgical instrument according to claim 3, wherein: There are two pushing portions, each of which includes two pushing blocks arranged in parallel, and the extending portion extends backward from the pushing blocks.

6. The staple cartridge assembly for a surgical instrument according to claim 5, wherein: Each of the resisting portions includes a first resisting block and a second resisting block that are arranged in parallel. The first resisting block is closer to the limiting block than the second resisting block, and the extending portion extends backward from the first resisting block.

7. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: In the initial state and after the cutting knife is retracted, the connecting portion is located outside the nail magazine body.

8. The staple cartridge assembly for a surgical instrument according to any one of claims 1 and 7, wherein: The base is positioned within the knife slot, and the portion of the cutting knife includes the base.

9. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The staple cartridge body includes an insertion end and a tail end; When the pusher member moves forward, the pusher member drives the cutting knife to move forward, so that the cutting knife moves from the end of the nail magazine body to the insertion end of the nail magazine body; When the knife pusher is retracted from the insertion end of the nail magazine body to the end of the nail magazine body, the knife pusher brings the cutting knife back to the end of the nail magazine body.

10. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The nail magazine body includes an insertion end and an end; the knife slot separates the nail magazine body into a first side and a second side, and the end of the nail magazine body is provided with a first protrusion and a second protrusion extending upward from the top surface of the nail magazine body, the first protrusion is located on the first side, and the second protrusion is located on the second side.

11. The staple cartridge assembly for a surgical instrument according to claim 10, wherein: When the cutting knife is located at the end of the nail magazine body, the blade portion is located between the first protrusion and the second protrusion.

12. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The knife pushing member includes a second accommodating structure, and the second accommodating structure is used to accommodate a part of the cutting knife.

13. The staple cartridge assembly for a surgical instrument according to claim 12, wherein: The pusher member also includes a second extension portion extending downward from the main body; the main body is provided with a second recess formed upward from its bottom surface; a first recess is formed upward between the first extension portion and the second extension portion, the first recess is the second accommodating structure, and the second extension portion is located between the first recess and the second recess.

14. The staple cartridge assembly for a surgical instrument according to claim 1, wherein: The staple cartridge assembly further includes a staple and a staple pusher, wherein the staple cartridge body is provided with a staple cavity, the staple being accommodated in the staple cavity, and the staple pusher is used to push the staple out of the staple cavity; The pusher is used for pushing the nail pushing member.

15. A surgical instrument comprising a shaft assembly and an end effector disposed at one end of the shaft assembly; the shaft assembly comprising the blade pusher, a portion of which is located within the end effector; characterized in that: The surgical instrument further comprises a staple cartridge assembly for a surgical instrument according to any one of claims 1 to 14, wherein the staple cartridge assembly is detachably mounted on the end effector.

16. The surgical instrument according to claim 15, wherein: The end actuator is equipped with a limiting member, and in an initial state, the limiting member abuts against the knife pusher; the nail magazine assembly applies force to the limiting member to separate it from the knife pusher.

17. The surgical instrument according to claim 16, wherein: The end actuator includes a nail magazine seat and a nail anvil pivotally connected to the nail magazine seat, the nail magazine assembly is detachably mounted on the nail magazine seat; the limiting member is pivotally mounted on the nail magazine seat.

18. The surgical instrument according to claim 17, wherein: The limiting member includes a main body and a first protrusion extending laterally to one side from the main body and a second protrusion extending laterally to the other side. The nail magazine seat includes two side walls arranged opposite to each other, and each side wall is respectively provided with a receiving hole. The receiving holes include a first receiving hole and a second receiving hole. The first protrusion can be pivotally installed in the first receiving hole, and the second protrusion can be pivotally installed in the second receiving hole.

19. The surgical instrument according to claim 18, wherein: The limiting member further includes a protrusion extending from the main body, and the protrusion and the first protrusion extend in the same direction.

20. The surgical instrument according to claim 19, wherein: The limiting component further includes a torsion spring, which is wound around the first protruding column and has one end abutting against the protruding block.

21. The surgical instrument according to claim 15, wherein: The end actuator includes a nail magazine seat and a nail support seat pivotally connected to the nail magazine seat; the surgical instrument also includes a spring plate installed in the nail magazine seat, one end of the spring plate abuts against the bottom wall of the nail magazine seat, and the other end of the spring plate abuts against the pusher member.

22. The surgical instrument according to claim 21, wherein: The staple cartridge body includes an insertion end and a tail end; The spring sheet exerts an upward supporting force on the pusher member, so that a portion of the pusher member abuts upward against the anvil seat; When the cutting knife is located at the end of the nail magazine body, the nail support pivots to open the end actuator, and the first extension portion of the knife pusher moves upward under the action of the spring and disengages from the recess of the additional portion of the cutting knife.

23. The surgical instrument according to claim 15, wherein: The surgical instrument also includes a handle assembly, and the shaft assembly extends from the handle assembly; the handle assembly includes a transmission mechanism, and the transmission mechanism is connected to the shaft assembly, and the transmission mechanism drives the shaft assembly to move forward or backward.

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