Firing mechanism and stapler

Abstract

The present invention provides a firing mechanism and a stapler. The firing mechanism includes an actuating rod with a stop groove formed therein; a firing handle having a first position, and a pin provided inside the firing handle. The pin has a first state and a second state. When the pin is in the first state and the firing handle is in the first position, the first end of the pin protrudes from the first end of the firing handle and enters the stop groove, and the firing handle is non-rotatable relative to the actuating rod; a pressing button. When the pressing button moves in a first direction, the first end of the pin is pressed to move in the direction of the second end of the firing handle, and the pin enters the second state. By adopting the present invention, when the stapler is not in a state where it can be fired, the pin in the first state is inserted into the stop groove of the actuating rod, restricting the rotation of the firing handle, and the driving member of the firing handle cannot drive the actuating rod to move distally, and the operator cannot hold the firing handle to fire the stapler, thereby avoiding accidental firing of the stapler.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a firing mechanism and a stapler. Background Art

[0002] Digestive tract diseases are one of the high-incidence diseases in humans. During the treatment process, staplers are often used to replace manual operations of doctors to anastomose physiological tissues such as the digestive tract. The linear stapler is a common surgical instrument with an outer shell, and most of them adopt a linear stapling method to anastomose physiological tissues such as the esophagus, stomach, and intestine during surgery.

[0003] The linear stapler generally includes an instrument platform and a head detachably mounted on the platform. The head can pass through a small incision on the body through a trocar to approach the surgical site for surgery. Specifically, the instrument platform includes a firing handle, and the detachable head includes a cartridge housing and a staple head mounted at the distal end of the cartridge housing. A firing assembly is arranged inside the cartridge housing, and the staple head is the part for performing cutting and suturing actions. Driven by the firing handle, the firing assembly can drive the staple head to complete the suture and cutting operation.

[0004] In the existing linear stapler, when the surgery is not ready, the doctor may mistakenly hold the firing handle due to carelessness or lack of experience, resulting in accidental firing of the stapler, affecting the surgical effect and even causing damage to the patient. Summary of the Invention

[0005] Aiming at the problems in the prior art, the purpose of the present invention is to provide a firing mechanism and a stapler, when a pin is inserted into a stop groove of an actuating rod, the operator cannot hold the firing handle to fire the stapler.

[0006] An embodiment of the present invention provides a firing mechanism for a stapler. The firing mechanism includes: an actuating rod, a stop groove is provided on the actuating rod; a firing handle, the firing handle has a first position, a pin is arranged inside the firing handle, the pin has a first state and a second state. When the pin is in the first state and the firing handle is in the first position, the first end of the pin protrudes from the first end of the firing handle and enters the stop groove, and the firing handle is non-rotatable relative to the actuating rod; a pressing button, when the pressing button moves in a first direction, it presses the first end of the pin to move towards the second end of the firing handle, so that the pin enters the second state from the first state.

[0007] Optionally, it further includes a balance block. The balance block includes a rotating part and a connecting part. The connecting part of the balance block is connected to the pressing button, and when the rotating part of the balance block rotates in the first direction, it drives the pressing button to move in the first direction.

[0008] Optionally, a pin slot is provided inside the firing handle, the pin is disposed in the pin slot, and a pin return member is provided between the second end of the pin and the pin slot, and the pin can only move linearly along the direction defined by the pin slot.

[0009] Optionally, the pin return member is a compression spring. When the pin is in the second state, the second end of the pin compresses the compression spring and deforms it.

[0010] Optionally, a first mating portion and a second mating portion are respectively provided on the pin and the pressing button. When the pressing button moves in the first direction, the first mating portion presses the second mating portion, so that the first end of the pin moves toward the firing handle.

[0011] Optionally, both the first mating portion and the second mating portion are bosses, or the first mating portion is a boss and the second mating portion is a concave groove, or the first mating portion is a concave groove and the second mating portion is a boss.

[0012] Optionally, the first mating portion is a boss, the boss includes a stop portion and a step portion, and the second mating portion is a concave groove that cooperates with the stop portion.

[0013] Optionally, the pressing button includes a pressing portion connected to the second mating portion, and the pressing portion penetrates through the housing of the stapler.

[0014] Optionally, a pressing button limiting member is provided on the housing of the stapler, and the pressing button limiting member is located on the path of the pressing button moving in the first direction.

[0015] Optionally, the firing handle further has a second position. When the pin is in the second state, the first end of the pin disengages from the stop groove, and the firing handle can rotate between the first position and the second position.

[0016] Optionally, an arc groove recessed toward the inside of the actuating rod is provided at the proximal end of the stop groove. When the pin is in the first state and the firing handle rotates from the second position to the first position, the arc groove cooperates with the first end of the pin and guides the first end of the pin into the stop groove.

[0017] Optionally, a driving member is further provided on the firing handle. The actuating rod has a third position and a fourth position, and a rack and a propulsion tooth are respectively provided at the proximal end and the distal end of the stop groove;

[0018] When the actuating rod is in the third position and the firing handle rotates from the second position to the first position, the driving member contacts the advancing teeth and pushes the actuating rod to move distally into the fourth position of the stapler;

[0019] When the actuating rod is in the fourth position and the firing handle rotates from the second position to the first position, the driving member contacts the rack and pushes the actuating rod to move distally of the stapler.

[0020] An embodiment of the present invention further provides a stapler, which includes the firing mechanism described above.

[0021] The firing mechanism and the stapler provided by the present invention have the following advantages:

[0022] The present invention provides a firing mechanism for a stapler, which realizes the firing insurance of the stapler through the cooperation of a pin and an actuating rod. After the stapler is closed, the doctor needs to adjust the stacking state of the tissue at the staple head, for example, flatten the tissue to make it reach a state where it can be fired. When the tissue does not reach the state where it can be fired, the pin is inserted into the stop groove in the actuating rod, restricting the rotation of the firing handle. The driving member of the firing handle cannot drive the actuating rod and thus cannot push the actuating rod to move distally, and the operator cannot hold the firing handle to fire the stapler, thereby preventing the stapler from being fired before the surgical preparation is completed; when the pressing button moves in the first direction, the pin can be pressed to disengage from the stop groove and does not restrict the rotation of the firing handle, allowing the handle to rotate to a state where the driving member can drive the actuating rod to fire the stapler; the present invention can be applied not only to linear staplers but also to other types of staplers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0024] Figure 1 is a schematic structural diagram of the cooperation between the firing mechanism and the stapler body according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of the firing mechanism in an initial state according to an embodiment of the present invention;

[0026] Figures 3 - 4 is a schematic diagram of the cooperation between the pin, the pressing button, and the rack according to an embodiment of the present invention;

[0027] Figures 5 - 6 is a schematic diagram of the cooperation between the pin and the pressing button according to an embodiment of the present invention;

[0028] Figures 7 - 8It is a schematic structural diagram of a rack according to an embodiment of the present invention;

[0029] Figures 9 - 10 It is a schematic structural diagram of a firing mechanism when pressing the firing handle according to an embodiment of the present invention;

[0030] Figure 11 It is a schematic structural diagram of the firing mechanism in the safety position according to an embodiment of the present invention;

[0031] Figure 12 It is a schematic structural diagram of the firing mechanism in the firing position according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] 1 Stapler body 6 Pin

[0034] 11 Pressing button limiting member 61 First end of the pin

[0035] 2 Fixed handle 62 Second end of the pin

[0036] 3 Firing handle 63 First mating portion

[0037] 31 First end of the firing handle 631 Stopping portion

[0038] 32 Second end of the firing handle 632 Step portion

[0039] 4 Driving member 7 Pin return spring

[0040] 5 Actuating rod 8 Pressing button

[0041] 51 Rack 81 Second mating portion

[0042] 511 Rack groove 82 Pressing portion

[0043] 52 Arc groove 821 Finger position

[0044] 53 Stopping groove 9 Balance weight

[0045] 54 Pushing tooth 91 Rotating portion

[0046] 58 Smooth portion 92 Connecting portion Detailed implementation manners

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their repetitive description will be omitted.

[0048] To solve the technical problems in the prior art, the present invention provides a firing mechanism for a stapler, the firing mechanism comprising: an actuating rod having a stop groove formed therein; a firing handle having a first position, and a pin provided inside the firing handle, the pin having a first state and a second state. When the pin is in the first state and the firing handle is in the first position, a first end of the pin protrudes beyond a first end of the firing handle and enters the stop groove, and the firing handle cannot be rotated and reset relative to the actuating rod; a pressing button, when the pressing button moves in a first direction, pressing the first end of the pin to move in a direction towards a second end of the firing handle, so that the pin moves from the first state to the second state. An embodiment of the present invention further provides a stapler comprising the firing mechanism. The stapler is not limited to a linear stapler and may also be other types of staplers.

[0049] Therefore, in the firing mechanism of the present invention, the firing insurance of the stapler is achieved through the cooperation of the pin and the actuating rod. When the stapler is not in a state where it can be fired, the pin is in the first state, the pin is inserted into the stop groove in the actuating rod, restricting the rotational reset of the firing handle, and the driving member of the firing handle and the actuating rod cannot interact with each other. Even if the firing handle is pressed, the actuating rod cannot be pushed to move distally, and the operator cannot hold the firing handle to fire the stapler, thus avoiding accidental firing of the stapler. Therefore, when the pin is in the first state, the stapler is in an insurance state and cannot be fired normally. When the pressing button moves in the first direction, the pin can be pressed to disengage from the stop groove and no longer restrict the rotational movement of the firing handle.

[0050] The structures of the firing mechanisms of the various embodiments of the present invention will now be described with reference to the accompanying drawings.

[0051] As Figures 1 - 12As shown, the firing mechanism of the first embodiment of the present invention and the structure of its components are shown. In this embodiment, the firing mechanism includes an actuating rod 5, a firing handle 3, and a pressing button 8. The actuating rod 5 is provided with a stop groove 53; the firing handle 3 has a first position and a second position. A pin 6 is disposed inside the firing handle 3. The pin 6 has a first state and a second state. When the pin 6 is in the first state and the firing handle 3 is in the first position, the first end 61 of the pin 6 protrudes from the first end 31 of the firing handle 3 and enters the stop groove 53, and the firing handle 3 is non-rotatable relative to the actuating rod 5; when the pressing button 8 moves in the first direction, it presses the first end 61 of the pin 6 to move in the direction of the second end 32 of the firing handle 3, so that the pin 6 enters the second state from the first state. The first direction in this embodiment is the Figure 4 direction of B indicated in. In this embodiment, when the pin 6 is in the second state, the pin retracts in the direction of the second end of the firing handle 3 to disengage from the stop groove 53.

[0052] As Figure 1 shown, it is a schematic diagram of the cooperation between the firing mechanism and the stapler body according to an embodiment of the present invention. The actuating rod 5 is disposed inside the stapler body 1, and the distal end of the actuating rod 5 is connected to the cutter pushing assembly. The actuating rod 5 has a third position and a fourth position. The third position is proximal to the fourth position. When the actuating rod 5 continues to move distally towards the stapler, it can push the cutter pushing assembly to achieve the firing of the stapler. The stapler body 1 is provided with a fixed handle 2. The first end 31 of the firing handle 3 is pivotally connected to the stapler body 1, and a firing handle reset structure is provided between the firing handle 3 and the stapler body 1. This firing handle reset structure can be a structure such as a tension spring, a torsion spring, or a compression spring. When the firing handle 3 is held by the operator, it can rotate relative to the stapler body 1 in the direction of A in the figure. Figure 1 The position of the firing handle 3 shown in is the second position. At this time, the firing mechanism is in the initial state. When the operator holds the firing handle 3 and makes the second end 32 of the firing handle 3 close to the fixed handle 2, the firing handle 3 enters the first position. When the operator releases the firing handle 3, the firing handle 3 can rotate in the direction opposite to the direction of A under the action of the firing handle reset structure, the second end 32 of the firing handle 3 moves away from the fixed handle 2, and the firing handle 3 returns to the second position.

[0053] In the present invention, the distal end and the proximal end are relative to the operator. Among them, the distal end refers to the end farther from the operator, and the proximal end refers to the end closer to the operator. For example, in Figure 1 the perspective of, the distal end of the stapler body 1 refers to the left end in the figure, and the proximal end refers to the right end in the figure.

[0054] AsFigure 2 As shown in the figure, it is a schematic structural view of the firing mechanism in the initial state according to an embodiment of the present invention. At this time, the firing handle 32 is in the second position and the pin 6 is in the first state. In this embodiment, a pin slot 33 is provided inside the firing handle 3, the pin 6 is disposed in the pin slot 33, the pin 6 can only move along the direction defined by the pin slot 33, and a pin return member 7 is provided between the second end 62 of the pin 6 and the pin slot 33. In this embodiment, the pin return member 7 is a compression spring. When the pin 6 is subjected to the pressure of the pressing button 8 in the direction towards the second end 32 of the firing handle 3, the pin 6 enters the second state from the first state. At the same time, the second end 62 of the pin 6 compresses the compression spring to deform, that is, the first state of the pin 6 is a protruding state, and the second state of the pin 6 is a retracted state. When the pressing button 8 moves in the direction opposite to the first direction, the pressing button 8 no longer presses the pin 6, and the pin 6 returns to the first state under the action of the deformation restoring force of the compression spring.

[0055] As Figures 3 to 6 shown in the figure, in this embodiment, the firing mechanism further includes a balance weight 9. The balance weight 9 includes a rotating portion 91 and a connecting portion 92. The connecting portion 92 of the balance weight 9 is fixedly connected to the pressing button 8, and the rotating portion 91 is pivotally set on the fixed handle 2. When the rotating portion 91 rotates in the first direction, it drives the pressing button 8 to move in the first direction. The balance weight 9 can also be rotatably fixed to the housing of the stapler body 1. For example, a corresponding rotating shaft is provided inside the housing of the stapler body 1, and the balance weight 9 is sleeved outside the rotating shaft. However, the present invention is not limited thereto, and the balance weight 9 can also adopt other fixing methods.

[0056] Therefore, in this embodiment, through the cooperation of the balance weight 9, the pressing button 8 and the pin 6, the state of the pin 6 can be changed by the movement of the pressing button 8. The movement of the pressing button 8 always takes the balance weight 9 as the center, and the pressing button 8 does not generate displacement in the axial direction of the balance weight 9 relative to the stapler body 1, improving the overall structural stability of the firing mechanism and facilitating the operation of the operator.

[0057] As Figures 3 - 6 shown in the figure, in this embodiment, a first mating portion 63 and a second mating portion 81 are respectively provided on the pin 6 and the pressing button 8. When the pressing button 8 moves in the first direction, the first mating portion 63 presses the second mating portion 81, so that the first end 61 of the pin 6 moves in the direction towards the second end 32 of the firing handle 3.

[0058] In this embodiment, the first mating portion 63 is a convex platform, the convex platform includes a stop portion 631 and a step portion 632, and the second mating portion 81 is a concave platform that cooperates with the stop portion 631. In​Figure 4 In the perspective of Figure 4 , the stop portion 631 is located above the stepped portion 632, and the stop portion 631 directly cooperates with the second mating portion 81. In other alternative embodiments, the first mating portion 63 and the second mating portion 81 can both be provided as bosses, or the first mating portion 63 can be provided as a boss of other shapes, the second mating portion 81 is a concave groove, or the first mating portion 63 is provided as a concave groove, and the second mating portion 81 is a boss, etc. When the balance weight 9 rotates in the first direction, it drives the pressing button 8 to move in the first direction. The concave groove of the pressing button 8 presses the boss of the pin 6, and compresses the compression spring 7 in the obliquely downward direction, so that the first end 61 of the pin 6 moves towards the second end 32 of the firing handle 3, and the pin 6 can enter the second state from the first state.

[0059] The pressing button 8 includes a pressing portion 82 connected to the second mating portion 81. The pressing portion 82 passes through the housing of the stapler and protrudes out of the housing. In this embodiment, there are two pressing portions 82, which respectively pass through the housings on both sides of the stapler body 1. Further, a pressing button limiting member 11 is also provided on the housing of the stapler. The pressing button limiting member 11 is located on the path of the pressing button 8 moving in the first direction, and is used to limit the movement of the pressing button 8 in the first direction. A finger position 821 can also be respectively provided on the pressing portions 82 to facilitate the operator to operate from both the left and right sides of the housing.

[0060] As Figure 7 and Figure 8 shown, an arc groove 52 recessed towards the inside of the actuating rod 5 can be provided at the proximal end of the stop groove 53. When the pin 6 is in the first state and the firing handle 3 rotates from the second position to the first position, the arc groove 52 cooperates with the first end 61 of the pin 6 and guides the first end 61 of the pin 6 into the stop groove 53.

[0061] In this embodiment, a driving member 4 is further provided on the firing handle 3, a rack 51 and a driving tooth 54 are further provided below the actuating rod 5, the rack 51 is located at the proximal end of the driving tooth 54, and a smooth portion 58 is provided between the rack 51 and the driving tooth 54. The rack 51 and the driving tooth 54 can respectively cooperate with the driving member 4 of the firing handle 3. In the initial state, the actuating rod 5 is in the third position. When the firing handle 3 rotates from the second position to the first position, the driving member 4 contacts the driving tooth 54 and drives the actuating rod 5 to move distally into the fourth position of the stapler; when the actuating rod 5 is in the fourth position and the firing handle 3 rotates from the second position to the first position, the driving member 4 enters the area of the rack 51 and can further push the actuating rod 5 to move distally to push the knife pushing assembly, thereby firing the stapler.

[0062] The following combines Figures 9 - 12 Specifically introduce the structure of the firing mechanism of this embodiment in various states.

[0063] In the initial position, as Figure 2 shown, the first end 61 of the pin 6 protrudes from the firing handle 3 and is located in the area of the rack 51, and the driving member 4 is located in the smooth portion 58.

[0064] When the stapler is closed, as Figure 9 and Figure 10 shown, when the firing handle 3 is held, the firing handle 3 is in two positions during the process of rotating from the second position to the first position. During this process, the actuating rod 5 moves from the third position to the fourth position. As Figure 9 shown, it is the state where the firing handle 3 is slightly held. At this time, the pin 6 is in the first state, but has been slightly compressed by the arc groove 52, and the first end 61 of the pin 6 still protrudes from the firing handle 3. As Figure 10 shown, it is the state where the firing handle 3 is held to the maximum. At this time, the pin 6 is still in the first state, and the pin 6 has reached the farthest end of the arc groove 52. That is, when the firing handle 3 rotates from the second position to the first position, the first end 61 of the pin 6 is guided by the arc groove 52 to gradually approach the position of the stop groove 53. At this time, continue to hold the firing handle 3, as Figure 11 shown, the firing handle 3 rotates to the first position until the driving member 4 contacts the driving tooth 54. Continue to press the firing handle 3, and the firing handle 3 can push the actuating rod 5 with the driving tooth 54 to move distally by the driving member 4. The actuating rod 5 is pushed to move in the C direction in the figure and enters the fourth position. And the pin 6 enters the stop groove 53.

[0065] At this time, since the actuating rod 5 is pushed to the fourth position, if the firing handle 3 returns to the second position, the position of the driving member 4 will be opposite to the position of the rack 51. When the operator continues to press the firing handle 3 and rotates it from the second position to the first position, the driving member 4 will further push the rack 51 towards the distal end of the stapler, and the stapler can be fired. However, before the surgical preparation is completed, if the operator mistakenly presses the firing handle 3, it will cause accidental firing of the stapler. Therefore, in Figure 11 state, since the first end 61 of the pin 6 is inserted into the stop groove 53, the stop groove 53 restricts the rotational movement of the pin 6, which also restricts the rotational reset movement of the firing handle 3. The firing handle 3 cannot return from Figure 11 the first position in to the second position, and the operator cannot press the firing handle 3 again, avoiding accidental firing before the surgical preparation is completed.

[0066] And in Figure 11 state, if the pressing button 8 is pressed downwards, the pressing button 8 rotates in the first direction around the rotating part 91 of the balance block 9, driving the first end 61 of the pin 6 to move towards the second end 32 of the firing handle 3. The first end of the pin 6 is disengaged from the stop groove 53 of the actuating rod 5, and the stop groove 53 no longer restricts the rotation of the firing handle 3. At this time, the operator releases the firing handle 3, and the firing handle 3 can return to the second position under the reset action of the firing handle reset structure, entering Figure 12 state. After the firing handle 3 is reset, the pressing button 8 can be released, and the pin 6 returns to the first state.

[0067] As Figure 12 shown, it is a schematic structural diagram of the firing mechanism of this embodiment when it is in the firing position. At this time, the actuating rod 5 is in the fourth position, and the driving member 4 of the firing handle 3 cooperates with the rack 51. If the firing handle 3 is held and the firing handle 3 is rotated from the second position to the first position along the A direction, the driving member 4 will push the actuating rod 5 towards the distal end of the stapler through the rack 51, realizing the firing of the stapler. In order to avoid excessive resistance to the rotation of the firing handle 3 caused by the first end 61 of the pin 6, a rack groove 511 can be further opened at the part where the rack 51 cooperates with the first end 61 of the pin 6, so that the first end 61 of the pin 6 moves along the rack groove 511 towards the distal end of the rack.

[0068] The firing mechanism and stapler provided by the present invention have the following advantages:

[0069] The present invention provides a firing mechanism for a stapler, which realizes the firing insurance of the stapler through the cooperation of a pin post and an actuating rod. After the stapler is closed, the doctor needs to adjust the stacking state of the tissues at the staple head, for example, flatten the tissues to make them reach a state where they can be fired. When the tissues do not reach the state where they can be fired, the pin post is inserted into the stop groove in the actuating rod, restricting the rotation of the firing handle. The driving member of the firing handle cannot drive the actuating rod and thus cannot push the actuating rod to move distally. The operator cannot hold the firing handle to fire the stapler, thereby avoiding the stapler from being fired before the surgical preparation is completed. When the pressing button moves in the first direction, the pin post can be pressed to disengage from the stop groove, without restricting the rotation of the firing handle, and the handle can be rotated to a position where the driving member can drive the actuating rod to fire the stapler. The present invention can be applied not only to linear staplers but also to other types of staplers.

[0070] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A firing mechanism, characterized in that, For a stapler, the firing mechanism includes: An actuating rod, which is provided with a stop groove; A firing handle, which has a first position. A pin is arranged inside the firing handle. The pin has a first state and a second state. When the pin is in the first state and the firing handle is in the first position, the first end of the pin protrudes from the first end of the firing handle and enters the stop groove, and the firing handle is non-rotatable relative to the actuating rod; A pressing button. When the pressing button moves in a first direction, it presses the first end of the pin to move towards the second end of the firing handle, so that the pin enters the second state from the first state.

2. The firing mechanism according to claim 1, characterized in that, It further includes a balance block, which includes a rotating part and a connecting part. The connecting part of the balance block is connected to the pressing button. When the rotating part of the balance block rotates in the first direction, it drives the pressing button to move in the first direction.

3. The firing mechanism according to claim 1, characterized in that, A pin slot is arranged inside the firing handle. The pin is arranged in the pin slot, and a pin return member is arranged between the second end of the pin and the pin slot. The pin only has a linear motion along the direction defined by the pin slot.

4. The firing mechanism according to claim 3, characterized in that, The pin return member is a compression spring. When the pin is in the second state, the second end of the pin compresses the compression spring to deform.

5. The firing mechanism according to claim 1, characterized in that, A first matching part and a second matching part which are matched with each other are respectively arranged on the pin and the pressing button. When the pressing button moves in the first direction, the first matching part presses the second matching part, so that the first end of the pin moves towards the second end of the firing handle.

6. The firing mechanism according to claim 5, characterized in that, Both the first matching part and the second matching part are convex platforms, or the first matching part is a convex platform and the second matching part is a concave platform, or the first matching part is a concave platform and the second matching part is a convex platform.

7. The firing mechanism according to claim 5, characterized in that, The first matching part is a convex platform, the convex platform includes a stop part and a step part, and the second matching part is a concave platform matched with the stop part.

8. The firing mechanism according to claim 5, characterized in that, The pressing button includes a pressing part connected to the second matching part, and the pressing part penetrates through the housing of the stapler.

9. The firing mechanism according to claim 8, characterized in that, A pressing button limiting member is arranged on the housing of the stapler, and the pressing button limiting member is located on the path of the pressing button moving in the first direction.

10. The firing mechanism according to claim 1, characterized in that, The firing handle further has a second position. When the pin is in the second state, the first end of the pin is disengaged from the stop groove, and the firing handle can rotate between the first position and the second position.

11. The firing mechanism according to claim 10, wherein, An arc groove recessed towards the inside of the actuating rod is arranged at the proximal end of the stop groove. When the pin is in the first state and the firing handle rotates from the second position to the first position, the arc groove is matched with the first end of the pin and guides the first end of the pin into the stop groove.

12. The firing mechanism according to claim 10, characterized in that, A driving member is further arranged on the firing handle. The actuating rod has a third position and a fourth position. A rack and a propulsion tooth are respectively arranged at the proximal end and the distal end of the stop groove; When the actuating rod is in the third position and the firing handle rotates from the second position to the first position, the driving member contacts the advancing tooth and pushes the actuating rod to move distally into the fourth position of the stapler; When the actuating rod is in the fourth position and the firing handle rotates from the second position to the first position, the driving member contacts the rack and pushes the actuating rod to move distally of the stapler.

13. A stapler, characterized in that, The stapler includes the firing mechanism according to any one of claims 1 to 12.

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