Firing safety mechanism for a cutting stapler and cutting stapler

Abstract

The present application relates to a firing safety mechanism for a cutting stapler and to a cutting stapler. The cutting stapler (1) comprises a stapler body (2) and an execution assembly (3), the stapler body being provided with a rack (4) for transmitting a firing force and a firing safety mechanism (10) which can act on the rack, the firing safety mechanism being provided with a first locking arm (30) which can lock movement of the rack in a first translation direction (D1), a first control lever (23) which brings the first locking arm out of contact with the rack, a second locking arm (40) which can lock movement of the rack in a second, opposite translation direction (D2), a second control lever (24) which brings the second locking arm out of contact with the rack, wherein the first locking arm and the second locking arm are arranged separately from one another and the relative positional relationship therebetween is changeable, and the firing safety mechanism can assume any one of a first locking position, a second locking position or a third locking position.

Description

Technical Field

[0001] This application relates to a firing safety mechanism for a cutting stapler and a cutting stapler. Background Technology

[0002] Cutting and staplers are suitable for the transection, resection, and anastomosis of organs and tissues within the body, and are applicable to various open or laparoscopic surgeries. A cutting and stapler mainly consists of an actuating component for performing resection, transection, and anastomosis, and a stapler body for operating the actuating component to perform various functions. The distal end of the stapler body engages with the actuating component, while the proximal end of the stapler body has a handle, etc. The stapler body is sometimes also referred to as the operating component. The firing force generated in the stapler body is transmitted to the actuating component through components such as a rack, firing lever, etc.

[0003] Cutting staplers require safety mechanisms to prevent accidental firing or retraction of their actuators. Most existing cutting staplers' safety mechanisms can only lock in one direction, meaning they either prevent firing or only prevent retraction. Furthermore, most existing cutting stapler safety mechanisms operate only in specific positions. For example, existing safety mechanisms can only lock after the actuator has clamped, and cannot lock again during the next firing or retraction operation. Additionally, existing technologies lack a safety mechanism for the cutting stapler's rack. Summary of the Invention

[0004] To address at least one of the aforementioned problems in the prior art, according to a first aspect of this application, a firing safety mechanism for a cutting stapler is provided. The cutting stapler includes a stapler body and an actuation assembly attached to the stapler body. The stapler body is provided with a rack for transmitting a firing force generated within the stapler body to the actuation assembly, and a firing safety mechanism capable of acting on the rack. The firing safety mechanism is characterized by comprising: a first locking arm configured to contact the rack and lock movement of the rack in a first translational direction; a first control lever configured to control the first locking arm to disengage it from the rack; and a second locking arm configured to contact the rack and lock movement of the rack in a first translational direction. The movement of the locking rack in a second translational direction opposite to the first translational direction; a second control lever configured to control the second locking arm to disengage the second locking arm from the rack, wherein the first locking arm and the second locking arm are separately disposed, the relative positional relationship between the first locking arm and the second locking arm is changeable, and the firing safety mechanism is capable of taking any one of a first locking position, a second locking position, and a third locking position, in which the rack cannot move in the first translational direction but can move in the second translational direction, in the second locking position the rack cannot move in the second translational direction but can move in the first translational direction, and in the third locking position the rack cannot move in either the first or second translational direction.

[0005] According to a preferred embodiment, both the first locking arm and the second locking arm are V-shaped and rotatable.

[0006] According to a preferred embodiment, the first locking arm is provided with a first arm portion, a second arm portion, and a first fixed shaft located at the joint between the first arm portion and the second arm portion, and the first locking arm is rotatable around the first fixed shaft. The second locking arm is provided with a third arm portion, a fourth arm portion, and a second fixed shaft located at the joint between the third arm portion and the fourth arm portion, and the second locking arm is rotatable around the second fixed shaft.

[0007] According to a preferred embodiment, the firing safety mechanism is provided with a first biasing device configured to bias a first locking arm toward the rack so that the first locking arm contacts the rack, and a second biasing device configured to bias a second locking arm toward the rack so that the second locking arm contacts the rack.

[0008] According to a preferred embodiment, a first biasing device biases a first arm portion of a first locking arm, and a second biasing device biases a third arm portion of a second locking arm.

[0009] According to a preferred embodiment, both the first biasing device and the second biasing device are compression springs.

[0010] According to a preferred embodiment, the firing safety mechanism is provided with a first stop and a second stop. The first stop is configured to prevent the first locking arm from rotating further in a rotational direction toward the first stop, thereby preventing the rack from moving in a first translational direction. The second stop is configured to prevent the second locking arm from rotating further in another rotational direction toward the second stop, thereby preventing the rack from moving in a second translational direction, which is opposite to the other rotational direction.

[0011] According to a preferred embodiment, the first blocking member can act on the second arm of the first locking arm, and the second blocking member can act on the fourth arm of the second locking arm.

[0012] According to a preferred embodiment, both the first control lever and the second control lever are disposed on the operating part of the firing safety mechanism.

[0013] According to a preferred embodiment, the control unit is further provided with a control handle and a rotating shaft. The control unit and the first and second control levers disposed thereon are integrally rotatable about the rotating shaft. The control handle is used by the operator to place the firing safety mechanism in a first locked position, a second locked position, or a third locked position.

[0014] According to a preferred embodiment, the first locking arm and the second locking arm are arranged in opposite directions.

[0015] According to a preferred embodiment, the rack is in a first locked position when only the first locking arm is in contact with the rack; the rack is in a second locked position when only the second locking arm is in contact with the rack; and the rack is in a third locked position when both the first and second locking arms are in contact with the rack.

[0016] According to a preferred embodiment, a portion of the first locking arm is configured to engage with a recess between two adjacent teeth of the rack, and a portion of the second locking arm is configured to engage with a recess between two adjacent teeth of the rack.

[0017] According to a preferred embodiment, the first control lever is capable of pressing the second arm of the first locking arm, and the second control lever is capable of pressing the fourth arm of the second locking arm.

[0018] According to a second aspect of this application, a cutting stapler is provided, the cutting stapler including a stapler body and an actuation component attached to the stapler body, characterized in that the stapler body is provided with a rack for transmitting a firing force generated in the stapler body to the actuation component, and the aforementioned firing safety mechanism for cutting the stapler capable of acting on the rack.

[0019] Other features of this application will become apparent from the accompanying drawings and from the following description of exemplary embodiments. Attached Figure Description

[0020] The present application will now be described in detail below with reference to the accompanying drawings. It should be understood that the drawings are not necessarily drawn to scale; furthermore, for ease of illustration, components shown in one drawing may be omitted in other views. The drawings are for illustrating exemplary embodiments of the present application only and should not be considered as limiting the scope of the present application. In the drawings:

[0021] Figure 1 This is a perspective view schematically illustrating the overall structure of a cutting stapler according to an exemplary embodiment of this application;

[0022] Figure 2 This is a schematic cross-sectional view of a stapler body equipped with a firing safety mechanism according to an exemplary embodiment of this application;

[0023] Figure 3 It is a schematic perspective view showing the firing safety mechanism;

[0024] Figure 4 It is a perspective view schematically showing the operating part of the firing safety mechanism;

[0025] Figure 5 This is a perspective view schematically showing the second locking arm of the firing safety mechanism;

[0026] Figure 6 It is a perspective view schematically showing the first locked position of the firing safety mechanism;

[0027] Figure 7 This is a perspective view schematically showing the second locking position of the firing safety mechanism;

[0028] Figure 8 It is a perspective view schematically showing the third locked position of the firing safety mechanism; and

[0029] Figure 9 This is a schematic diagram showing the movement trajectory of the first arm of the firing safety mechanism in the third locked position.

[0030] List of reference numerals

[0031] 1 - Anastomosis cutter; 2 - Anastomosis cutter body; 3 - Execution component.

[0032] 4 - Rack 5 - Tooth 6 - Mounting plate

[0033] 10 – Firing safety mechanism; 20 – Control unit; 21 – Control handle

[0034] 22 — Rotation axis; 23 — First control lever; 24 — Second control lever

[0035] 25 — Plate-shaped component; 30 — First locking arm; 31 — First arm section

[0036] 32 — Second arm 33 — First fixed shaft 34 — First biasing device

[0037] 35 – First blocking element; 40 – Second locking arm; 41 – Third arm.

[0038] 42 – Fourth arm; 43 – Second fixed shaft; 44 – Second biasing device

[0039] 45 — Second blocking component; D1 — First translation direction; D2 — Second translation direction

[0040] S1 — First rotation direction; S2 — Second rotation direction Detailed Implementation

[0041] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. However, it should be understood that the descriptions of various embodiments are merely illustrative and not intended to limit the technology of this application. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0042] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. In the drawings, for clarity, the dimensions of some parts may be distorted, enlarged, or reduced; or some parts may be omitted or shown in simplified form to highlight certain parts.

[0043] Unless otherwise specified, all terms used in this specification have the meanings commonly understood by those skilled in the art. For the sake of brevity and / or clarity, well-known functions or structures, or those unrelated to the inventive points of this application, are not described in detail.

[0044] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in the specification may include plural forms. The terms “comprising,” “including,” and “containing” used in the specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in the specification includes any and all combinations of one or more of the relevant listed items.

[0045] When a specification states that a component is located "on," "attached" to, "connected" to, or "in contact" with another component, the component may be directly located on, directly attached to, directly connected to, or directly in contact with the other component, or there may be an intermediate component. This limitation applies to similar wording.

[0046] In the instruction manual, the terms "first," "second," and "third" are used only to distinguish the various components and are not intended to limit the order or function of the components. Furthermore, "second" or "third" components may be specified even if a component designated as "first" or "third" is not included or is used as a subsequent component.

[0047] In the instructions, "proximal" refers to the side closer to the operator (e.g., surgeon) of the cutting stapler 1, while "distal" refers to the side further away from the operator (i.e., closer to the patient).

[0048] In this instruction manual, unless otherwise stated, terms such as "left," "right," "up," "down," "outer," and "inner" refer to directions within the accompanying drawings. It should be understood that spatial relation terms such as "left," "right," "up," "down," "outer," and "inner" are intended to describe the relationship between one feature and another in the accompanying drawings. It should be understood that spatial relation terms include not only the orientations shown in the drawings but also the different orientations of the cutting stapler 1 during use or operation.

[0049] Below, we will refer to Figure 1 The basic structure of a cutting anastomosis device 1 according to a first exemplary embodiment of this application will be described below. The cutting anastomosis device 1 includes an anastomosis device body 2 and an execution assembly 3 that can be attached to the anastomosis device body 2. The anastomosis device body 2 mainly includes various components such as a handle, a power source, a firing lever, and a rack 4. The power source generates a firing force for firing the cutting anastomosis device. The rack 4 is used to transmit the firing force generated by the power source to the execution assembly 3 via the firing lever. The execution assembly 3 performs various operations such as cutting and anastomosis by receiving the firing force transmitted via the rack 4. Here, the rack 4 forms part of the drive transmission structure of the cutting anastomosis device 1. The rack 4 can also be used in conjunction with gears, etc., not shown.

[0050] like Figure 2 As shown, the cutting stapler 1 is equipped with a firing safety mechanism 10 to prevent the execution component 3 from being accidentally fired or withdrawn. According to an exemplary embodiment of this application, the firing safety mechanism 10 acts on the rack 4 of the cutting stapler 1, locking the state of the execution component by locking the linear movement of the rack 4. Specifically, the firing safety mechanism 10 can take any of the first locking position, second locking position, or third locking position described below. Figure 6As shown, in the first locked position, rack 4 cannot move in the first translational direction D1, but can move in the second translational direction D2. Figure 7 As shown, in the second locked position, rack 4 cannot move in the second translational direction D2, but can move in the first translational direction D1. Figure 8 As shown, in the third locked position, rack 4 cannot move in the first translation direction D1, nor can it move in the second translation direction D2. Here, the first translation direction D1 can refer to the retraction direction of the rack, and the second translation direction D2 can refer to the firing direction of the rack.

[0051] like Figure 3 As shown, the firing safety mechanism 10 can be integrally mounted on the mounting plate 6, wherein the operating handle 21 of the operating part 20, described below, is exposed to the outside of the cutting stapler 1 through a hole in the mounting plate 6. The mounting plate 6 can be a housing or frame component of the stapler body 2 or a part thereof.

[0052] The structure of the firing safety mechanism 10 is described in detail below.

[0053] like Figure 3 , 4 As shown, the firing safety mechanism 10 is provided with an operating part 20 for operating the firing safety mechanism 10. The operating part 20 may be provided with an operating handle 21 for the operator to operate by hand to place the firing safety mechanism 10 in a first locked position, a second locked position, or a third locked position. The operating handle 21 may also be referred to as a safety pin in practice. The operating part 20 is also provided with a rotating shaft 22. The rotating shaft 22 may also serve as a fixing shaft for the operating part 20, passing through a hole provided in a mounting plate 6 of, for example, the anastomosis device body 2, thereby fixing the operating part 20 relative to each other. The operating part 20 is also provided with a first control lever 23 and a second control lever 24, as described below. In addition, the operating part 20 may also include a plate-like member 25. The operating handle 21 may be attached to one side of the plate-like member 25, and the rotating shaft 22, the first control lever 23, and the second control lever 24 may be attached to the other side of the plate-like member 25. Preferably, the first control lever 23 is a component provided separately from the second control lever 24. The control unit 20 and the first control lever 23 and the second control lever 24 mounted thereon can rotate as a whole around the rotation axis 22.

[0054] like Figures 5 to 9 As shown, the firing safety mechanism 10 is further provided with a first locking arm 30 and a second locking arm 40. The first locking arm 30 is configured to contact the rack 4 and lock the movement of the rack 4 in the first translational direction D1. The second locking arm 40 is also configured to contact the rack 4 and lock the movement of the rack 4 in the second translational direction D2, which is opposite to the first translational direction D1.

[0055] The first locking arm 30 may be generally V-shaped. The first locking arm 30 is provided with a first arm portion 31, a second arm portion 32, and a first fixed shaft 33 located at the junction between the first arm portion 31 and the second arm portion 32. The first locking arm 30 is rotatable. The first locking arm 30 is capable of rotating about the first fixed shaft 33. Here, the first fixed shaft 33 also serves as the rotation axis of the first locking arm 30. The first fixed shaft 33 passes through a hole (not shown) provided in, for example, the mounting plate 6 of the stapler body 2, thereby fixing the first locking arm 30 relative to each other. The first control lever 23, the first biasing device 34 described below, and the first blocking member 35 are preferably all provided in the recess of the V-shaped first locking arm 30, thus making the overall structure of the firing safety mechanism 10 more compact.

[0056] The second locking arm 40 can also be generally V-shaped. The second locking arm 40 is provided with a third arm portion 41, a fourth arm portion 42, and a second fixed shaft 43 located at the junction between the third arm portion 41 and the fourth arm portion 42. The second locking arm 40 is rotatable, capable of rotating about the second fixed shaft 43. Here, the second fixed shaft 43 also serves as the rotation axis of the second locking arm 40. The second fixed shaft 43 passes through a hole (not shown) provided in, for example, the mounting plate 6 of the stapler body 2, thereby fixing the second locking arm 40 relative to each other. The second control lever 24, the second biasing device 44 described below, and the second blocking member 45 are preferably all provided in the recess of the V-shaped second locking arm 40, thus making the overall structure of the firing safety mechanism 10 more compact.

[0057] Preferably, a portion of the first locking arm 30 (i.e., the upper end of the first arm portion 31) can be configured to form-fit into a recess between two adjacent teeth 5 of the rack 4. Furthermore, a portion of the second locking arm 40 (i.e., the upper end of the third arm portion 41) can also be configured to form-fit into a recess between two adjacent teeth 5 of the rack 4. In an exemplary embodiment, the recess between two adjacent teeth 5 of the rack 4 is triangular, and the corners of the upper ends of the first arm portion 31 and the third arm portion 41 are also correspondingly triangular. The form-fit between the locking arms and the rack facilitates uniform force distribution between the rack and the locking arms, as well as smooth relative sliding between them.

[0058] Preferably, the first locking arm 30 and the second locking arm 40 are provided separately. Furthermore, the relative positional relationship between the first locking arm 30 and the second locking arm 40 is changeable. The first locking arm 30 and the second locking arm 40 can be arranged substantially symmetrically in opposite directions. Compared to the case where the first and second locking arms are integrally provided, their relative positional relationship is fixed, and therefore they are controlled in a linked manner, the separately provided first locking arm 30 and second locking arm 40 facilitate independent firing control, require less installation space, allow the firing safety mechanism 10 according to this application to be installed in a limited space, and also enable a more compact overall structure of the cutting stapler 1.

[0059] Furthermore, the firing safety mechanism 10 may be provided with a first biasing device 34 and a second biasing device 44. The first biasing device 34 is configured to always bias the first locking arm 30 toward the rack 4, such that the first locking arm 30 contacts the rack 4, that is, the upper end of the first arm portion 31 of the first locking arm 30 is fitted into the recess between two adjacent teeth 5 of the rack 4. The second biasing device 44 is configured to always bias the second locking arm 40 toward the rack 4, such that the second locking arm 40 contacts the rack 4, that is, the upper end of the third arm portion 41 of the second locking arm 40 is fitted into the recess between two adjacent teeth 5 of the rack 4. As an example, the first biasing device 34 may bias the first arm 31 of the first locking arm 30. The second biasing device 44 may bias the third arm 41 of the second locking arm 40.

[0060] Preferably, the first biasing device 34 and / or the second biasing device 44 can be compression springs. Alternatively, the first biasing device 34 and / or the second biasing device 44 can also be tension springs (not shown) arranged in opposite directions.

[0061] The firing safety mechanism 10 is also provided with the aforementioned first control lever 23 and second control lever 24. The first control lever 23 is configured to disengage the first locking arm 30 from the rack 4. The second control lever 24 is configured to disengage the second locking arm 40 from the rack 4.

[0062] Specifically, by rotating the operating handle 21 of the operating unit 20 to press the second arm 32 of the first locking arm 30 with the first control lever 23, the first locking arm 30 can overcome the biasing force of the first biasing device 34 and rotate around the first fixed axis 33 in a counterclockwise direction, i.e., the first rotation direction S1. As a result, the first arm 31 of the first locking arm 30 will disengage from the rack 4, and the first locking arm 30 will not restrict the movement of the rack 4. Similarly, by rotating the operating handle 21 of the operating unit 20 to press the fourth arm 42 of the second locking arm 40 with the second control lever 24, the second locking arm 40 can overcome the biasing force of the second biasing device 44 and rotate around the second fixed axis 43 in a clockwise direction, i.e., the second rotation direction S2. As a result, the third arm 41 of the second locking arm 40 will disengage from the rack 4, and the second locking arm 40 will not restrict the movement of the rack 4.

[0063] Furthermore, the firing safety mechanism 10 may also be provided with a first blocking member 35 and a second blocking member 45. The first blocking member 35 is configured to prevent the first locking arm 30 from rotating further along the rotation direction toward the first blocking member 35 (clockwise in the figure, i.e., the second rotation direction S2). Thus, the first locking arm 30, which is prevented from rotating clockwise, can prevent the rack 4 from translating along the first translation direction D1 (to the right in the figure). The second blocking member 45 is configured to prevent the second locking arm 40 from rotating further along the rotation direction toward the second blocking member 45 (counterclockwise in the figure, i.e., the first rotation direction S1). Thus, the second locking arm 40, which is prevented from rotating counterclockwise, can prevent the rack 4 from translating along the second translation direction D2 (to the left in the figure). For example, the first blocking member 35 can act on the second arm portion 32 of the first locking arm 30. The second blocking member 45 can act on the fourth arm portion 42 of the second locking arm 40.

[0064] According to the firing safety mechanism 10 of this application, such as Figure 6 As shown, when only the first locking arm 30 is in contact with the rack 4, the first locking arm 30 is also in contact with the first blocking member 35. The rack 4 is in the first locked position, and the rack 4 cannot move in the first translational direction D1, but can move in the second translational direction D2. Figure 7 As shown, when only the second locking arm 40 is in contact with the rack 4, the second locking arm 40 is also in contact with the second blocking member 45. The rack 4 is in the second locked position, and the rack 4 cannot move in the second translational direction D2, but can move in the first translational direction D1. Figure 8As shown, when both the first locking arm 30 and the second locking arm 40 are in contact with the rack 4, the first locking arm 30 is also in contact with the first blocking member 35 and the second locking arm 40 is also in contact with the second blocking member 45. The rack 4 is in the third locking position, and the rack 4 cannot move in the first translation direction D1 or in the second translation direction D2.

[0065] Further reference Figure 9 This describes why rack 4 cannot move left or right in the third locked position. As shown in the figure, if rack 4 wants to move along the first translation direction D1, the first locking arm 30 needs to rotate along the second rotation direction S2. However, at this time, the first blocking member 35 prevents the first locking arm 30 from rotating clockwise along the second rotation direction S2. Therefore, the first locking arm 30 cannot rotate, and rack 4 cannot move to the right along the first translation direction D1. Similarly, if rack 4 wants to move along the second translation direction D2, the second locking arm 40 needs to rotate counterclockwise along the first rotation direction S1. However, at this time, the second blocking member 45 prevents the second locking arm 40 from rotating counterclockwise along the first rotation direction S1. Therefore, the second locking arm 40 cannot rotate, and rack 4 cannot move to the left along the second translation direction D2.

[0066] This application is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation to cover all such modifications as well as equivalent structures and functions.

Claims

1. A firing safety mechanism for a cutting stapler, the cutting stapler (1) comprising a stapler body (2) and an actuation component (3) attached to the stapler body (2), characterized in that, The stapler body is provided with a rack (4) for transmitting the firing force generated in the stapler body to the actuation component (3), and a firing safety mechanism (10) that can act on the rack (4), the firing safety mechanism (10) being provided with: A first locking arm (30) is configured to contact the rack (4) and lock the movement of the rack (4) in the first translational direction (D1); A first control lever (23) is configured to control a first locking arm (30) to disengage the first locking arm from the rack (4); The second locking arm (40) is configured to contact the rack (4) and lock the rack (4) in a second translation direction (D2) opposite to the first translation direction (D1); The second control lever (24) is configured to control the second locking arm (40) to disengage the second locking arm from the rack (4). The first locking arm (30) and the second locking arm (40) are set separately. The relative positional relationship between the first locking arm (30) and the second locking arm (40) is changeable. The firing safety mechanism (10) can take any one of the first locking position, the second locking position and the third locking position. In the first locking position, the rack (4) cannot move in the first translation direction (D1) but can move in the second translation direction (D2). In the second locking position, the rack (4) cannot move in the second translation direction (D2) but can move in the first translation direction (D1). In the third locking position, the rack (4) cannot move in either the first translation direction (D1) or the second translation direction (2).

2. The firing safety mechanism for a cutting stapler according to claim 1, characterized in that, Both the first locking arm (30) and the second locking arm (40) are V-shaped and rotatable.

3. The firing safety mechanism for a cutting stapler according to claim 1, characterized in that, The first locking arm (30) is provided with a first arm portion (31), a second arm portion (32), and a first fixed shaft (33) located at the joint between the first arm portion (31) and the second arm portion (32). The first locking arm (30) is rotatable around the first fixed shaft (33). The second locking arm (40) is provided with a third arm portion (41), a fourth arm portion (42), and a second fixed shaft (43) located at the joint between the third arm portion (41) and the fourth arm portion (42). The second locking arm (40) is rotatable around the second fixed shaft (43).

4. The firing safety mechanism for a cutting stapler according to claim 3, characterized in that, The firing safety mechanism (10) is provided with a first biasing device (34) configured to bias the first locking arm (30) toward the rack (4) so ​​that the first locking arm (30) contacts the rack (4), and a second biasing device (44) configured to bias the second locking arm (40) toward the rack (4) so ​​that the second locking arm (40) contacts the rack (4).

5. The firing safety mechanism for a cutting stapler according to claim 4, characterized in that, The first biasing device (34) biases the first arm portion (31) of the first locking arm (30), and the second biasing device (44) biases the third arm portion (41) of the second locking arm (40).

6. The firing safety mechanism for a cutting stapler according to any one of claims 4 to 5, characterized in that, Both the first biasing device (34) and the second biasing device (44) are compression springs.

7. The firing safety mechanism for a cutting stapler according to any one of claims 3 to 5, characterized in that, The firing safety mechanism (10) is provided with a first stop (35) and a second stop (45). The first stop (35) is configured to prevent the first locking arm (30) from rotating further in a direction toward the first stop (35), thereby preventing the rack (4) from moving in a first translational direction (D1). The second stop (45) is configured to prevent the second locking arm (40) from rotating further in another direction toward the second stop (45), thereby preventing the rack (4) from moving in a second translational direction (D2), which is opposite to the other direction of rotation.

8. The firing safety mechanism for a cutting stapler according to claim 7, characterized in that, The first blocking member (35) can act on the second arm (32) of the first locking arm (30), and the second blocking member (45) can act on the fourth arm (42) of the second locking arm (40).

9. The firing safety mechanism for a cutting stapler according to any one of claims 1 to 5, characterized in that, The first control lever (23) and the second control lever (24) are both mounted on the operating part (20) of the firing safety mechanism.

10. The firing safety mechanism for a cutting stapler according to claim 9, characterized in that, The control unit (20) is also provided with a control handle (21) and a rotating shaft (22). The control unit (20) and the first control lever (23) and the second control lever (24) provided thereon can rotate together around the rotating shaft (22). The control handle (21) is used by the operator to place the firing safety mechanism (10) in a first locked position, a second locked position or a third locked position.

11. The firing safety mechanism for a cutting stapler according to any one of claims 1 to 5, characterized in that, The first locking arm (30) and the second locking arm (40) are arranged in opposite directions.

12. The firing safety mechanism for a cutting stapler according to any one of claims 1 to 5, characterized in that, When only the first locking arm (30) contacts the rack (4), the rack (4) is in the first locking position; when only the second locking arm (40) contacts the rack (4), the rack (4) is in the second locking position; when both the first locking arm (30) and the second locking arm (40) are in contact with the rack (4), the rack (4) is in the third locking position.

13. The firing safety mechanism for a cutting stapler according to any one of claims 1 to 5, characterized in that, A portion of the first locking arm (30) is configured to fit into a recess between two adjacent teeth (5) of the rack (4), and a portion of the second locking arm (40) is configured to fit into a recess between two adjacent teeth (5) of the rack (4).

14. The firing safety mechanism for a cutting stapler according to any one of claims 3 to 5, characterized in that, The first control lever (23) can press the second arm (32) of the first locking arm (30), and the second control lever (24) can press the fourth arm (42) of the second locking arm (40).

15. A cutting stapler, the cutting stapler (1) comprising a stapler body (2) and an actuation component (3) attached to the stapler body (2), characterized in that, The stapler body (2) is provided with a rack (4) for transmitting the firing force generated in the stapler body to the actuation component (3), and a firing safety mechanism for cutting the stapler according to any one of claims 1 to 14 that can act on the rack (4).

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