Nail bin connecting assembly and surgical anastomat

Abstract

The utility model provides a staple cartridge connecting assembly and a surgical anastomat, the assembly is used for connecting a staple cartridge assembly of the surgical anastomat to an instrument body, and the assembly comprises a shell and a connecting seat at least partially located in the shell; the push broach rod is fixed on the connecting seat; the safety mechanism comprises a safety block and a safety pin, the safety pin comprises a pivot part and a guide part, the pivot part fixes the safety block to the connecting seat in a rotatable mode, and the guide part is used for guiding the safety block to rotate. The safety block is provided with a first position for limiting the axial movement of the push broach rod and a second position for not limiting the axial movement of the push broach rod, and the guide part is aligned with the near end of the push broach rod in the axial direction of the anastomat. The installation stability of the safety mechanism is improved, and the structural strength of the nail bin connecting assembly shell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a staple cartridge connection assembly and a surgical stapler. Background Art

[0002] In the prior art, a medical stapler includes an instrument body, an operating handle movably connected to the stapler body, and a staple magazine assembly that cooperates with the instrument body. A firing rod is disposed inside the instrument body, and the staple magazine assembly includes a staple magazine connector and a staple magazine and anvil located at the distal side of the staple magazine connector. The staple magazine assembly is detachably mounted on the distal side of the instrument body through the staple magazine connector. When the stapler is fired, the doctor drives the firing rod to move toward the distal side by holding the operating handle, and then drives the cutting knife through the knife push rod in the staple magazine assembly to complete the suture operation.

[0003] Before the staple cartridge assembly is installed to the instrument body of the medical stapler, during the assembly, packaging and transportation, the knife pusher rod may jump axially, so that the knife pusher rod pushes the cutter to move, resulting in the misfiring of the instrument. Moreover, the displacement of the knife pusher rod may also cause the instrument body to be unable to be properly installed with the knife pusher rod, resulting in the inability to use the instrument normally. Therefore, a safety mechanism is provided in the staple cartridge connector. When the staple cartridge assembly is not loaded into the instrument body, the safety mechanism cooperates with the limiting part of the shell of the staple cartridge connection assembly to limit the movement of the knife pusher rod relative to the shell. Here, the staple cartridge assembly is in a safety state, ensuring that the safety state can be unlocked and the knife pusher rod can be in a firing state only after the staple cartridge assembly is loaded into the instrument body.

[0004] The existing safety mechanism is fixed by a pin, and a protrusion is provided at one end of the pin facing the housing of the nail magazine connection component, and a groove corresponding to the protrusion is also provided on the inner side of the housing of the nail magazine connection component to limit the position of the pin and prevent the pin from falling out. During the firing process of the stapler, as the pusher rod moves toward the distal side, the protrusion will also move axially relative to the housing of the nail magazine connection component. Therefore, the corresponding groove on the housing of the nail magazine connection component needs to be opened relatively large to leave movement space for the protrusion, which reduces the structural strength of the housing of the nail magazine connection component. Due to the presence of the protrusion, the fitting clearance between the housing of the nail magazine connection component and the connecting seat is large, and only a small part of the fitting surface between the housing of the nail magazine connection component and the protrusion of the pin is in contact, and the fitting stability is not high. Utility Model Content

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a staple cartridge connection assembly and a surgical stapler, which are conducive to improving the installation stability of the safety mechanism and improving the structural strength of the shell of the staple cartridge connection assembly.

[0006] The present application embodiment provides a staple cartridge connection assembly for connecting a staple cartridge assembly of a surgical stapler to an instrument body, the assembly comprising a housing and:

[0007] Connecting seat;

[0008] A knife-pushing rod, the knife-pushing rod is fixed to the connecting seat;

[0009] A safety mechanism, the safety mechanism includes a safety block and a safety pin, the safety pin includes a pivot portion and a guide portion, the pivot portion rotatably fixes the safety block to the connecting seat, so that the safety block has a first position that limits the axial movement of the push knife rod and a second position that does not limit the axial movement of the push knife rod, and the guide portion is aligned with the proximal end of the push knife rod in the axial direction of the stapler.

[0010] In some embodiments, one side of the inner wall of the shell is provided with a first mating groove and a second mating groove extending along the axial direction, the guide portion at least partially enters the first mating groove, and one side of the pusher rod partially enters the second mating groove, and the first mating groove and the second mating groove are aligned in the axial direction.

[0011] In some embodiments, the first mating groove and the second mating groove are located at the top end of the inner wall of the shell in the longitudinal direction, and in the longitudinal direction, the height of the guide portion is less than or equal to the height of the push knife rod, and / or, in the transverse direction, the thickness of the guide portion is less than or equal to the thickness of the push knife rod.

[0012] In some embodiments, the safety pin also includes a mating portion and a fixing portion, the first end of the fixing portion and the pivot portion are respectively connected to the mating portion, the guide portion is connected to the second end of the fixing portion, and the fixing portion is at least partially located on the side of the connecting seat facing the first mating groove.

[0013] In some embodiments, a mounting groove is provided on one side of the connecting seat facing the first matching groove, the fixing portion is at least partially embedded in the mounting groove, and in the longitudinal direction, the depth of the mounting groove is greater than or equal to the height of the fixing portion.

[0014] In some embodiments, the axial width of the fixing portion is less than or equal to the axial width of the guiding portion.

[0015] In some embodiments, the matching portion is located outside the safety block, and the safety block is confined between the matching portion and the wall surface of the connecting seat. The axial dimension and the longitudinal dimension of the matching portion are both larger than the diameter of the pivot portion.

[0016] In some embodiments, the shell includes a first shell and a second shell that are arranged opposite to each other, and the outer side surface of the matching portion matches with the inner walls of the first shell and the second shell at the same time.

[0017] In some embodiments, the shell includes a first shell and a second shell that are arranged opposite to each other, the first shell is located on one side of the second shell in the longitudinal direction, and the first mating groove and the second mating groove are located at the top end of the inner wall of the first shell in the longitudinal direction.

[0018] In some embodiments, a limiting portion is provided on the inner side of the second shell, and the safety block includes a first abutting portion and a second abutting portion. When the safety block is in the first position, the first abutting portion of the safety block is located on the proximal side of the second abutting portion, and the second abutting portion abuts against the limiting portion to limit the axial movement of the push knife rod. After the first abutting portion is subjected to a force in the distal direction to drive the safety block to rotate, the safety block enters the second position, and the second abutting portion is separated from the limiting portion.

[0019] The present application also provides a surgical stapler, comprising the above-mentioned staple magazine connecting assembly.

[0020] The staple cartridge connection assembly and surgical stapler provided in the present application have the following advantages:

[0021] The present application provides a stapler magazine connection assembly, which is used to connect the stapler magazine assembly of a surgical stapler to an instrument body. A safety mechanism is arranged inside a shell of the stapler magazine connection assembly. When the stapler magazine assembly is not installed on the instrument body, the axial movement of the knife pusher rod is limited by the safety block to prevent the knife pusher rod from axially moving. Moreover, the cooperation between the safety pin and the shell of the stapler magazine connection assembly makes the installation and fixation of the safety mechanism more stable. The guide portion is aligned with the proximal end of the knife pusher rod in the axial direction of the stapler, which better utilizes the space inside the shell and reduces the influence of the groove on the side of the shell on the strength of the shell, which is beneficial to improving the structural strength of the shell of the stapler magazine connection assembly and reducing the matching clearance between the inner wall of the shell and the safety mechanism. The overall structure is more stable. The axial movement of the safety pin can be guided by the cooperation between the shell and the guide portion, and the rotation, longitudinal and lateral movement of the safety pin relative to the shell are limited, so that the safety pin has only axial movement relative to the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings.

[0023] Figure 1 It is a schematic diagram of the cooperation between the nail magazine connection assembly, the nail magazine assembly and the nail anvil according to an embodiment of the present application;

[0024] Figure 2 is a structural schematic diagram of a nail magazine connection assembly according to an embodiment of the present application;

[0025] Figure 3 is a schematic structural diagram of a safety block in an embodiment of the present application when it is in a first position;

[0026] Figure 4 It is a schematic diagram of the cooperation between the safety mechanism and the second housing according to an embodiment of the present application;

[0027] Figure 5 is a schematic structural diagram of a safety block in an embodiment of the present application when it is in the second position;

[0028] Figure 6 It is a schematic diagram of the cooperation between the safety mechanism and the connecting socket according to an embodiment of the present application;

[0029] Figure 7 It is an exploded view of the cooperation between the safety mechanism and the connecting seat in one embodiment of the present application;

[0030] Figure 8 is a structural schematic diagram of a first shell according to an embodiment of the present application;

[0031] Fig. 9 It is a schematic diagram of the cooperation between the first shell, the safety pin and the knife push rod in one embodiment of the present application.

[0032] Reference numerals:

[0033] 1 Shell 222 Mating portion

[0034] 11 First housing 223 Fixing portion

[0035] 111 first matching groove 224 guide portion

[0036] 112 second matching groove 23 torsion spring

[0037] 118 Stopper 3 Pushing rod

[0038] 12 Second housing 4 Connecting seat

[0039] 121 limiting portion 41 shaft hole

[0040] 21 Safety block 42 Mounting slot

[0041] 211 first abutting portion 91 nail magazine

[0042] 212 second abutting portion 92 nail anvil

[0043] 22 safety pin 93 sleeve

[0044] 221 Pivot DETAILED DESCRIPTION

[0045] The example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided so that the present application will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. "Or" and "or" in the specification may both mean "and" or "or". Although the terms "upper", "lower", "between", etc. may be used in this specification to describe different exemplary features and elements of the present application, these terms are used herein only for convenience, such as according to the directions of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional direction of the structure to fall within the scope of the present application. Although "first" or "second" etc. are used in this specification to represent certain features, they are only used to represent the function, and are not used as a limitation on the number and importance of specific features.

[0046] The present application provides a stapler magazine connection assembly for connecting the stapler magazine assembly of a surgical stapler to an instrument body. The stapler magazine connection assembly includes a connection seat, a knife pusher rod and a safety mechanism. The knife pusher rod is fixed to the safety seat. The safety mechanism includes a safety block and a safety pin. The safety block has a first position for limiting the axial movement of the knife pusher rod. When the stapler magazine assembly is not installed to the instrument body, the safety block is in the first position, limiting the axial movement of the knife pusher rod, and preventing the knife pusher rod from axial movement.

[0047] The safety pin includes a pivot portion and a guide portion, and the pivot portion rotatably fixes the safety block to the connecting seat. When the staple cartridge assembly is mounted on the instrument body, the safety block can be driven to rotate and disengage from the first position and enter the second position, and the axial movement of the knife pusher rod is no longer restricted. Therefore, the guide portion is aligned with the proximal end of the knife pusher rod in the axial direction of the stapler, which can better utilize the space inside the shell, reduce the influence of the groove on the side of the shell on the shell strength, and is conducive to improving the structural strength of the shell of the staple cartridge connection assembly, reducing the matching gap between the inner wall of the shell and the safety mechanism, and making the overall structure more stable. The axial movement of the safety pin can be guided by the matching of the shell and the guide portion, and the rotation, longitudinal and lateral movement of the safety pin relative to the shell can be restricted, so that the safety pin can only move axially relative to the shell.

[0048] The structure of the nail magazine connection assembly in a specific embodiment is described below in conjunction with the accompanying drawings. It should be understood that the accompanying drawings and the following description are only examples and are not intended to limit the scope of protection of this application.

[0049] Figure 1The structure of the staple cartridge connection assembly and the staple cartridge assembly in one embodiment of the present application is shown. The staple cartridge assembly includes a staple anvil 92, a staple cartridge 91 and a cutter (not shown in the figure) arranged opposite to each other, the proximal end of the staple cartridge assembly is connected to the distal end of the staple cartridge connection assembly, the proximal end of the staple cartridge connection assembly is detachably mounted on the instrument body of the stapler, and a sleeve 93 is provided on the outside of the staple cartridge connection assembly. Figures 2 to 8 The structure of the nail magazine connection assembly of this embodiment is shown. The nail magazine connection assembly includes a housing 1, a connection seat 4, a pusher rod 3 and a safety mechanism. The proximal end of the pusher rod 3 is fixed to the connection seat 4, the distal end of the pusher rod 3 cooperates with the cutter, and the pusher rod 3 can move axially relative to the nail magazine connection assembly housing 1.

[0050] In this application, the distal end and the proximal end are relative to the operator. The distal end is the end away from the operator, that is, the end close to the surgical site, and the proximal end is the end away from the surgical site, that is, the end close to the operator. The axial direction refers to the axial direction of the stapler. Figure 1 In the perspective of , the S1 direction or the direction opposite to S1 is the axial direction. The longitudinal direction is the height direction, that is, Figure 2 and Figure 3 The vertical direction in the viewing angle is the horizontal direction, and the horizontal direction is the width direction, that is, Figure 6 S3 direction in perspective.

[0051] like Figure 2 and Figure 8 As shown, in this embodiment, the housing 1 includes a first housing 11 and a second housing 12. The first housing 11 is located on one side of the second housing 12 in the longitudinal direction. The first housing 11 and the second housing 12 together form a receiving cavity. The connecting seat 4 and the safety mechanism are both located in the receiving cavity, and the pusher rod 3 is at least partially located in the receiving cavity. Figure 8 and Fig. 9 As shown, the top of the inner wall of the first shell 11 is provided with a first mating groove 111 and a second mating groove 112, and the first mating groove 111 and the second mating groove 112 both extend along the axial direction of the stapler. The upper end portion of the pusher rod 3 is located in the second mating groove 112, and can move relative to the shell 1 along the extension direction of the second mating groove 112. The inner wall of the second shell 12 is also provided with a third mating groove (not shown in the figure), and the lower end portion of the pusher rod 3 is located in the third mating groove, and the axial movement of the pusher rod 3 is jointly limited by the second mating groove 112 and the third mating groove.

[0052] like Figures 2 to 5 As shown, the safety mechanism is arranged inside the housing 1, and the safety mechanism includes a safety block 21 and a safety pin 22. The safety block 21 includes a first abutting portion 211 and a second abutting portion 212. The safety block 21 has Figure 3 The first position shown and Figure 5 The safety block 21 is rotatably fixed to the connection seat 4 by a safety pin 22, so that the safety block 21 is axially fixed to the connection seat 4 and can be rotated relative to the connection seat 4 to switch between the first position and the second position. A torsion spring 23 is sleeved on the safety pin 22, and the two bases of the torsion spring 23 are respectively abutted against the connection seat 4 and the safety block 21, applying a biasing force to the safety block 21 to keep it in the first position.

[0053] like Figure 3 and Figure 4 As shown, a limiting portion 121 is provided on the inner side of the second shell 12. When the nail magazine connection assembly is not installed on the instrument body, the safety block 21 is maintained in the first position under the biasing force of the torsion spring 23, and the first abutting portion 211 of the safety block 21 is located on the proximal side of the second abutting portion 212. The second abutting portion 212 abuts against the limiting portion 121, so that the safety block 21 cannot move in the distal direction relative to the shell 1, and the connecting seat 4 axially fixed to the safety block 21 and the knife pusher rod 3 fixed to the connecting seat 4 cannot move in the distal direction relative to the shell 1, thereby limiting the axial movement of the knife pusher rod 3 and avoiding accidental axial movement of the knife pusher rod 3. Figure 5 As shown, when the nail magazine connecting assembly is installed on the instrument body, the instrument body abuts against the first abutting portion 211 and applies a force in the distal direction to the first abutting portion 211, driving the first abutting portion 211 to move in the distal direction, and the safety block 21 moves along the Figure 5 The safety block 21 rotates in the direction S2 so that it enters the second position. At this time, the second abutting portion 212 is separated from the limiting portion 121 and no longer restricts the axial movement of the knife push rod 3, so the stapler can be fired normally.

[0054] like Figures 6 to 8 As shown, the safety pin 22 includes a pivot portion 221, a matching portion 222, a fixing portion 223 and a guide portion 224. The pivot portion 221 is installed in the shaft hole 41 of the connecting seat 4 to rotatably fix the safety block 21 to the connecting seat 4. The matching portion 222 is connected to an outer end of the pivot portion 221, and the matching portion 222 is located on the outer side of the safety block 21, and the safety block 21 is confined between the connecting block and the wall surface of the connecting seat 4. The guide portion 224 is located on the side of the connecting seat 4 facing the first matching groove 111, and the guide portion 224 is connected to the top end of the matching portion 222 through the fixing portion 223. As shown Fig. 9As shown, the guide portion 224 is aligned with the proximal end of the pusher rod 3 in the axial direction, and the guide portion 224 is at least partially located in the first matching groove 111. Therefore, through the matching of the safety pin 22 and the nail magazine connection assembly housing 1, the installation and fixation of the safety mechanism is more stable, and the first matching groove 111 limits the longitudinal and lateral movement of the safety pin 22, so that the safety pin 22 will not fall out of the connection seat 4. Figure 8 and Fig. 9 As shown, the first matching groove 111 and the second matching groove 112 are aligned in the axial direction, that is, the first matching groove 111 is added to the proximal end of the second matching groove 112 originally opened in the first shell 11, which has the least effect on the structural strength of the first shell 11, which is conducive to improving the structural strength of the shell 1. The guide portion 224 and the upper end of the pusher rod 3 cooperate with the same side of the first shell 11, which is conducive to reducing the matching gap between the inner wall of the shell 1 and the safety mechanism, and the overall structure is more stable. The first matching groove 111 guides the axial movement of the safety pin 22 and limits the rotation, longitudinal and lateral movement of the safety pin 22 relative to the shell 1, so that the safety pin 22 has only axial movement relative to the shell 1. In one embodiment, the first matching groove 111 and the second matching groove 112 can be connected to form a through groove, and a stopper 118 is provided between the first matching groove 111 and the second matching groove 112 to limit the proximal end of the pusher rod 3. In another embodiment, the first matching groove 111 and the second matching groove 112 can also be two grooves that are not connected to each other but are axially aligned.

[0055] like Figure 6 As shown, the first end of the fixing portion 223 is connected to the top end of the matching portion 222, the guide portion 224 is connected to the second end of the fixing portion 223, and the fixing portion 223 is at least partially located on the side of the connecting seat 4 facing the first matching groove 111. In the longitudinal direction, the height of the guide portion 224 is less than or equal to the height of the pusher rod 3. In the transverse direction, the thickness of the guide portion 224 is less than or equal to the thickness of the pusher rod 3. Thus, the transverse width of the first matching groove 111 can be set to be less than or equal to the transverse width of the second matching groove 112. The top wall of the first matching groove 111 can limit the longitudinal movement of the guide portion 224, and the side wall of the first matching groove 111 can limit the transverse movement of the guide portion 224, so that the safety pin 22 has no transverse and longitudinal movement relative to the housing 1. As shown Figure 6 and Figure 7As shown, the connection seat 4 is provided with a mounting groove 42 on one side facing the first matching groove 111, and the fixing portion 223 is at least partially embedded in the mounting groove 42. In the longitudinal direction, the depth of the mounting groove 42 is greater than or equal to the height of the fixing portion 223, so that the fixing portion 223 does not protrude from the upper side of the connection seat 4, and thus does not increase the matching clearance between the housing 1 and the connection seat 4. By adopting this structure, the matching clearance between the housing 1 and various internal components can be reduced, making the overall structure more stable.

[0056] like Figure 6 and Figure 7 As shown, the axial width of the fixing portion 223 is less than or equal to the axial width of the guide portion 224, which can reduce the axial width of the mounting groove 42 on the connecting seat 4. The axial dimension and longitudinal dimension of the matching portion 222 are both greater than the diameter of the pivot portion 221. Figure 2 and Figure 4 It can be seen that the outer side surface of the matching portion 222 matches with the inner wall of the first shell 11 and the second shell 12 at the same time, which is beneficial to increase the contact area between the safety pin 22 and the shell 1, further improve the matching stability between the safety pin 22 and the shell 1, and through the limiting effect of the shell 1 on the matching portion 222, the lateral movement of the safety pin 22 relative to the shell 1 is further limited.

[0057] The above embodiments are described by taking the case that the housing 1 includes a first housing 11 and a second housing 12 arranged longitudinally as an example. In other embodiments, the housing 1 may also be an integral housing or include other housing structures such as two transversely arranged housings. The above embodiments are described by taking the case that the first matching groove 111 is arranged on the first housing 11 and the limiting portion 121 is arranged on the second housing 12 as an example. In other embodiments, the first matching groove may also be arranged on the inner wall of the second housing 12, for example, at the proximal end of the third matching groove, the guide portion may be correspondingly arranged at the bottom of the connecting seat and protrude downward, the limiting portion may also be arranged on the first housing 11, etc., all of which are within the protection scope of this application.

[0058] The above content is a further detailed description of the present application in combination with specific preferred implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, several simple deductions or substitutions can be made without departing from the concept of the present application, which should be deemed to fall within the scope of protection of the present application.

Claims

1. A nail magazine connection assembly, characterized in that: Used to connect a stapler assembly of a surgical stapler to an instrument body, the assembly comprising a housing and: Connecting seat; A knife-pushing rod, the knife-pushing rod is fixed to the connecting seat; A safety mechanism, the safety mechanism includes a safety block and a safety pin, the safety pin includes a pivot portion and a guide portion, the pivot portion rotatably fixes the safety block to the connecting seat, so that the safety block has a first position that limits the axial movement of the push knife rod and a second position that does not limit the axial movement of the push knife rod, and the guide portion is aligned with the proximal end of the push knife rod in the axial direction of the stapler.

2. The staple cartridge connection assembly according to claim 1, characterized in that: A first mating groove and a second mating groove extending along the axial direction are provided on one side of the inner wall of the shell, the guide portion at least partially enters the first mating groove, and one side of the pusher rod partially enters the second mating groove, and the first mating groove and the second mating groove are aligned in the axial direction.

3. The staple cartridge connection assembly according to claim 2, characterized in that: The first mating groove and the second mating groove are located at the top end of the inner wall of the shell in the longitudinal direction, and in the longitudinal direction, the height of the guide part is less than or equal to the height of the push knife rod, and / or, in the transverse direction, the thickness of the guide part is less than or equal to the thickness of the push knife rod.

4. The staple cartridge connection assembly according to claim 3, characterized in that: The safety pin also includes a matching portion and a fixing portion, the first end of the fixing portion and the pivot portion are respectively connected to the matching portion, the guide portion is connected to the second end of the fixing portion, and the fixing portion is at least partially located on a side of the connecting seat facing the first matching groove.

5. The staple cartridge connection assembly according to claim 4, characterized in that: A mounting groove is provided on one side of the connecting seat facing the first matching groove, and the fixing portion is at least partially embedded in the mounting groove. In the longitudinal direction, the depth of the mounting groove is greater than or equal to the height of the fixing portion.

6. The staple cartridge connection assembly according to claim 4, characterized in that: The axial width of the fixing portion is smaller than or equal to the axial width of the guiding portion.

7. The staple cartridge connection assembly according to claim 4, characterized in that: The matching portion is located outside the safety block, and the safety block is confined between the matching portion and the wall surface of the connecting seat. The axial dimension and the longitudinal dimension of the matching portion are both larger than the diameter of the pivot portion.

8. The staple cartridge connection assembly according to claim 7, characterized in that: The housing comprises a first housing and a second housing which are arranged opposite to each other, and the outer side surface of the matching portion matches with the inner walls of the first housing and the second housing at the same time.

9. The staple cartridge connection assembly according to claim 2, characterized in that: The shell comprises a first shell and a second shell which are arranged opposite to each other, the first shell is located at one side of the second shell in the longitudinal direction, and the first matching groove and the second matching groove are located at the top end of the inner wall of the first shell in the longitudinal direction.

10. The staple cartridge connection assembly according to claim 9, characterized in that: A limiting portion is provided on the inner side of the second shell, and the safety block includes a first abutting portion and a second abutting portion. When the safety block is in the first position, the first abutting portion of the safety block is located on the proximal side of the second abutting portion, and the second abutting portion abuts against the limiting portion to limit the axial movement of the push knife rod. After the first abutting portion is subjected to a force in the distal direction to drive the safety block to rotate, the safety block enters the second position, and the second abutting portion is separated from the limiting portion.

11. A surgical stapler, characterized in that: The nail magazine connecting assembly comprises the nail magazine connecting assembly described in any one of claims 1 to 10.

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