Handle and stapler with manual resetting mechanism

Abstract

The present invention provides a handle and an anastomosis device with a manual reset mechanism. The handle includes a housing, a drive assembly, a transmission assembly, and a manual reset mechanism. The transmission assembly includes a rack and a transmission gear that can rotate forward or reverse around its axis under the drive of the drive assembly and drive the rack forward or backward; the manual reset mechanism includes a gear connecting rod that is rotatably arranged in the housing around a first rotation axis and one end of which is connected to the transmission gear, an operating assembly connected to the gear connecting rod, and a retraction assembly. When the operating assembly is operated, the gear connecting rod rotates around the first rotation axis under the drive of the operating assembly and drives the transmission gear to connect with the rack and the drive assembly or to disconnect from the rack and / or the drive assembly; when the transmission gear is in a disconnected state from the rack and / or the drive assembly, operating the retraction assembly can cause the rack to move forward or backward. The present invention is more labor-saving and convenient for users to operate by disconnecting the transmission gear from the rack or the drive assembly along its radial direction.

Description

Technical Field

[0001] The invention relates to a handle and an anastomosis device with a manual resetting mechanism. Background Art

[0002] Laparoscopic staplers are commonly used in laparoscopic surgery and are currently available from major surgical consumables manufacturers. The stapler features a retractable jaw. After clamping the tissue, a trigger handle pushes the cutting blade and wedge-shaped pusher forward, simultaneously pushing the staples upward and securing the tissue.

[0003] During use, a variety of unexpected situations can cause the stapler to stop functioning, such as battery depletion, circuit board signal loss, or motor damage. In these cases, the cutter cannot be retracted and the jaws cannot be opened using the control buttons. Furthermore, the motor can become locked and unable to rotate due to its inherent characteristics, and the gear or rack meshing with the motor gear can also be unable to move. Therefore, the device cannot be disengaged from the patient or removed from the abdominal cavity, resulting in serious clinical consequences. Therefore, the design of a safe and reliable manual reset mechanism is particularly necessary.

[0004] The technical solution currently adopted by most companies (such as Johnson & Johnson and most domestic manufacturers) is to mesh the motor output gear with the rack through a transmission gear. When unlocking is required, the transmission gear is pushed along the axial direction of the transmission gear to disengage it from the rack. However, the disadvantage of this solution is that when the front end of the instrument is stuck, the rack cannot move, and the powerful output force of the motor creates a huge squeezing force between it and the transmission gear, which increases the friction. A lot of force is required to push the transmission gear, and because the instrument is connected to the patient's tissue, it is difficult for the user to use a comfortable posture to exert force, which makes it impossible to unlock. In order to solve this problem, a complex cam lever mechanism can only be designed to amplify the operating force, which is costly. At the same time, a complex mechanism needs to be designed to keep the transmission gear and the rack disengaged to prevent the faulty instrument from being used again. Summary of the Invention

[0005] The object of the present invention is to provide a handle with a manual reset mechanism which is labor-saving and simple in structure.

[0006] Another object of the present invention is to provide a stapler comprising the handle.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A handle with a manual reset mechanism, comprising:

[0009] case;

[0010] A drive assembly, disposed on the housing;

[0011] a transmission assembly, comprising a transmission gear provided on the housing and a rack extending in a front-to-rear direction, the transmission gear being operably connected to the drive assembly and the rack, respectively, the transmission gear being capable of rotating forward or reversely about its axis under the drive of the drive assembly and driving the rack forward or backward, the axis of the transmission gear extending in a top-to-bottom direction;

[0012] The handle further includes a manual reset mechanism, which includes:

[0013] a gear connecting rod, the gear connecting rod being rotatably disposed in the housing about a first rotation axis, the first rotation axis being parallel to the axis of the transmission gear, one end of the gear connecting rod being connected to the transmission gear;

[0014] an operating assembly connected to the gear connecting rod. When the operating assembly is operated, the gear connecting rod rotates around the first rotation axis under the drive of the operating assembly, and drives the transmission gear to connect with the rack and the drive assembly or to disconnect from the rack and / or the drive assembly. The operating assembly may be exposed to the housing;

[0015] A retraction assembly is connected to the rack. When the transmission gear is disconnected from the rack and / or the driving assembly, the retraction assembly can be operated to move the rack forward or backward.

[0016] Preferably, the operating assembly includes a first connecting rod and a second connecting rod, one end of the first connecting rod is rotatably disposed on the gear connecting rod around a second rotation axis; one end of the second connecting rod is rotatably disposed in the housing around a third rotation axis, and the other end is rotatably disposed on the middle portion of the first connecting rod around a fourth rotation axis, and the second rotation axis, the third rotation axis, and the fourth rotation axis are parallel to the first rotation axis.

[0017] Pulling the first connecting rod outwards causes the first connecting rod, the second connecting rod and the gear connecting rod to rotate respectively, and drive the transmission gear to move outwards, so that the transmission gear is disconnected from the rack and / or the drive assembly.

[0018] Furthermore, the manual reset mechanism also includes a mating portion fixedly arranged in the shell, and the mating portion is located between the rack and the operating assembly. When the transmission gear is in a connected state with the rack and the drive assembly, the mating portion contacts the first connecting rod and / or the second connecting rod.

[0019] In some preferred embodiments, the matching portion is a bump.

[0020] Furthermore, the free end of the protrusion is arc-shaped.

[0021] Preferably, when the transmission gear is converted from a state connected to the rack and the drive assembly to a state disconnected from the rack and / or the drive assembly, the angle between the plane where the first rotation axis and the second rotation axis are located and the rack axis gradually decreases.

[0022] In some specific embodiments, when the transmission gear is connected to the rack and the drive assembly, the angle between the plane where the first rotation axis and the second rotation axis are located and the rack axis is approximately 90°, further 85° to 95°.

[0023] Preferably, one end portion of the gear connecting rod has a receiving area for accommodating the transmission gear, and the transmission gear is rotatably disposed in the receiving area.

[0024] Preferably, the manual reset mechanism further comprises a retaining assembly for keeping the transmission gear in a disconnected state from the rack and / or the drive assembly.

[0025] Furthermore, the holding assembly includes a holding hook and a torsion spring rotatably arranged in the housing around a fifth rotation axis, one end arm of the torsion spring is fixedly arranged in the housing, and the other end arm is fixedly connected to the holding hook;

[0026] When the transmission gear is in a connected state with the rack and the drive assembly, the retaining hook is abutted against the end face of the other end of the gear connecting rod; when the transmission gear is in a disconnected state with the rack and / or the drive assembly, the hook portion of the retaining hook is inserted into the groove at the other end of the gear connecting rod, and causes one end of the gear connecting rod to have a tendency to move outward.

[0027] Furthermore, the groove is located at the outer side of the other end portion of the gear connecting rod, and the groove has a matching surface adapted to the hook portion of the retaining hook.

[0028] Furthermore, the mating surface is a plane.

[0029] Preferably, the retraction assembly includes a retraction rod, which is fixedly connected to the rack and has one end extending out of the shell. The shell has a slide groove extending in the front-to-back direction. The retraction rod is located in the slide groove and can slide in the slide groove.

[0030] Preferably, the handle further comprises a frame arranged in the housing, and the gear connecting rod, the operating assembly and the retaining assembly are respectively mounted on the frame.

[0031] Furthermore, at least a portion of the frame is located between the rack and the gear connecting rod, the operating assembly and the retaining assembly.

[0032] Preferably, the shell has a hollow operation window, which is located on the shell outside the operation component, and the operation window can be selectively covered with a sticker.

[0033] Preferably, the drive assembly includes a motor having a motor gear, the motor is located below the rack and the rotation axis of the motor gear is parallel to the rotation axis of the transmission gear, the transmission gear is located on the side of the rack, and the side has a tooth surface. When the transmission gear is connected to the drive assembly and the rack, the transmission gear meshes with the tooth surfaces of the motor gear and the rack respectively.

[0034] Furthermore, the motor gear and the rack are located on the same side of the transmission gear.

[0035] Another object of the present invention is to provide a stapler comprising a working head, the stapler further comprising the handle as described above, the working head being connected to the handle.

[0036] The structure of the working head refers to the working head of the anastomosis device in the prior art.

[0037] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0038] The manual reset mechanism in the handle of the present invention enables the transmission gear to be disconnected from the rack or drive assembly along its radial direction through the design of the gear connecting rod, operating assembly and retaining assembly, which is more labor-saving and convenient for users to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a handle in one embodiment of the present invention;

[0040] Figure 2 for Figure 1 Exploded view of the handle;

[0041] Figure 3 for Figure 1 A schematic diagram of the internal structure of the handle;

[0042] Figure 4 for Figure 1 A schematic diagram of the internal structure of the handle from another angle;

[0043] Figure 5 for Figure 1 A top view of the internal structure of the handle;

[0044] Figure 6 for Figure 1 A schematic diagram of the structure of the transmission gear in the handle when it is disconnected from the rack and / or the drive assembly;

[0045] Figure 7 for Figure 6 Top view of the handle;

[0046] Figure 8 for Figure 6 A schematic diagram of the internal structure of the handle;

[0047] Figure 9 for Figure 6 A schematic diagram of the internal structure of the handle from another angle;

[0048] Figure 10 for Figure 6 A top view of the internal structure of the handle;

[0049] Figure 11 This is a schematic structural diagram of a transmission assembly and a drive assembly and other structures including a handle in one embodiment of the present invention;

[0050] Figure 12 for Figure 11 A top view of the transmission assembly, the drive assembly, and other structures including the handle;

[0051] Figure 13 Schematic diagram of the structure of a gear connecting rod in one embodiment of the present invention;

[0052] Figure 14 Schematic diagram of the structure of a stapler in one embodiment of the present invention;

[0053] Among them, 1, housing; 11, first housing; 12, second housing; 13, slide; 14, operation window;

[0054] 2. Motor; 21. Motor gear;

[0055] 3. Rack; 31. Tooth surface;

[0056] 4. Transmission gear;

[0057] 5. Gear connecting rod; 51. Distal end portion; 511. Accommodation area; 52. Proximal end portion; 521. Proximal end surface; 522. Groove; 523. Mating surface;

[0058] 6. Operating assembly; 61. First connecting rod; 62. Second connecting rod;

[0059] 7. Retaining assembly; 71. Retaining hook; 711. Hook portion; 72. Torsion spring;

[0060] 8. Retract pull rod;

[0061] 9. Frame; 91. Coordination unit;

[0062] A. Working head; A1. Actuator;

[0063] a. First rotation axis; b. Second rotation axis; c. Third rotation axis; d. Fourth rotation axis; e. Fifth rotation axis; f. Axis of the transmission gear;

[0064] x, front-to-back direction; y, left-right direction; z, up-down direction;

[0065] γ, the angle between the plane where the first rotation axis and the second rotation axis are located and the axis of the rack. DETAILED DESCRIPTION

[0066] The present invention is further described below with reference to the following examples. However, the present invention is not limited to the following examples. The implementation conditions used in the examples may be further adjusted according to the specific requirements of the application. Unspecified implementation conditions are conventional conditions in the industry. The technical features involved in the various embodiments of the present invention may be combined with each other as long as they do not conflict with each other.

[0067] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0068] In the description of the embodiments of the present invention, it should be understood that the terms "far", "near", etc. indicating directions or positional relationships are defined based on the direction of the handle when in use, where the side close to the operator is near and the side away from the operator is far. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the embodiments of the present invention.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0070] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the components and configurations of specific examples are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. In addition, the embodiments of the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or configurations discussed.

[0071] Example 1

[0072] The present invention provides a stapler, see Figure 14 Generally speaking, the stapler is used in laparoscopic surgery, for example, by being introduced into the surgical field through a trocar, but it should be noted that it can also be used in open surgery.

[0073] Specifically, the stapler includes a handle and a working head A detachably connected to the handle. The distal end of the working head A is divided into an actuator A1, which is suitable for clamping, suturing / staping, and cutting tissue. The specific structure and connection method of the working head A can refer to the existing art. The handle has a trigger, a gripping portion, and other parts. Pulling the trigger toward the gripping portion closes the jaws of the actuator A1. The specific structure and connection relationship of the trigger, gripping portion, etc. can refer to the existing art and are not specifically limited by this invention.

[0074] The handle of the present invention has a manual reset mechanism. When an unexpected situation occurs and the handle stops operating, the rack 3 can be reset by the manual reset mechanism, thereby retracting the cutting blade. The handle is further discussed below.

[0075] handle, see Figures 1 to 13 , including a housing 1, a drive assembly and a transmission assembly respectively arranged in the housing 1, and a manual reset mechanism at least partially arranged in the housing 1.

[0076] See also Figure 11 and Figure 12 The drive assembly includes a motor 2, and the output shaft of the motor 2 is provided with a motor gear 21 for outputting power. The transmission assembly includes a rack 3 and a transmission gear 4. The rack 3 is slidably disposed in the housing 1 and extends along the front-to-back direction x (i.e., the x-direction); the transmission gear 4 is operably connected to the drive assembly and the rack 3. It can rotate forward or reverse around its axis under the drive of the drive assembly and drive the rack 3 forward or backward. The axis f of the transmission gear 4 is parallel to the axis of the motor gear 21 and extends along the up-down direction z (i.e., the z-direction).

[0077] Specifically, the rack 3 is located above the motor gear 21, and the transmission gear 4 is located on the side of the rack 3 and the side of the motor gear 21 on the same side as the rack 3. The side of the rack 3 with the transmission gear 4 has a tooth surface 31 that is adapted to the transmission gear 4, so that the transmission gear 4 can engage with the rack 3 and the motor gear 21 at the same time. When the motor 2 is started, the rack 3 can be driven forward or backward through the transmission gear 4.

[0078] The manual reset mechanism includes a gear connecting rod 5 and an operating assembly 6. Specifically, see Figure 3 and Figure 8 The gear connecting rod 5 is rotatably arranged in the housing 1 around the first rotation axis a. The first rotation axis a is parallel to the axis f of the transmission gear 4. One end of the gear connecting rod 5 is connected to the transmission gear 4. The operating component 6 is connected to the gear connecting rod 5. When the operating component 6 is operated, the gear connecting rod 5 rotates around the first rotation axis a under the drive of the operating component 6, and drives the transmission gear 4 to connect with the rack 3 and the driving component (at this time, the handle is in the locked state, see Figures 3 to 5 ) or disconnected from the rack 3 and / or the drive assembly (at this point, the handle is in the unlocked state, see Figures 8 to 10 ).

[0079] In the prior art, the transmission gear 4 is generally disengaged (i.e., unlocked) from the rack 3 or the motor gear 21 by moving the transmission gear 4 axially. Specifically, the transmission gear 4 can be disengaged from the rack 3 or the motor gear 21 by applying an upward or downward force, thereby moving the transmission gear 4 upward or downward, such as in patents CN111202553B and CN105997171B. However, due to the strong output force of the motor 2 after it is locked, a huge extrusion force is generated between it and the transmission gear 4. Therefore, in practice, a large force is often required to disengage the transmission gear 4 from the rack 3 or the motor gear 21. The present invention causes the gear connecting rod 5 to drive the transmission gear 4 to rotate, thereby radially disengaging the transmission gear 4 from the rack 3 and / or the drive assembly. This eliminates the huge friction caused by the lateral force when the transmission gear 4 moves axially, thus saving effort and facilitating operation.

[0080] Furthermore, the operating assembly 6 includes a first connecting rod 61 and a second connecting rod 62 .

[0081] See also Figure 3 and Figure 8, one end of the first connecting rod 61 is rotatably arranged on the gear connecting rod 5 around the second rotation axis b. One end of the second connecting rod 62 is rotatably arranged in the housing 1 around the third rotation axis c, and the other end is rotatably arranged on the middle part of the first connecting rod 61 around the fourth rotation axis d. The second rotation axis b, the third rotation axis c, and the fourth rotation axis d are parallel to the first rotation axis a. Pulling the first connecting rod 61 outward, the first connecting rod 61, the second connecting rod 62, and the gear connecting rod 5 each rotate and drive the transmission gear 4 to move outward, causing the transmission gear 4 to be disconnected from the rack 3 and / or the drive assembly (i.e., disengaged). In this embodiment, pulling the first connecting rod 61 outward causes the transmission gear 4 to move outward, causing the transmission gear 4 to be disengaged from the rack 3 and the motor gear 21 at the same time. The operating assembly 6 of the present invention can amplify the force acting on the operating assembly 6 through the design of the first connecting rod 61 and the second connecting rod 62, so that the operator can easily pull out the operating rod. In addition, the structure is simple to manufacture, easy to install and has low production cost.

[0082] Specifically, the first connecting rod 61 and the gear connecting rod 5 as well as the second connecting rod 62, the first connecting rod 61 and the housing 1 are pivotally connected respectively.

[0083] Furthermore, the manual reset mechanism further includes a matching portion 91 fixedly disposed in the housing 1, see Figure 4 、 Figure 5 、 Figure 9 and Figure 10 The mating portion 91 is located between the rack 3 and the operating assembly 6. When the transmission gear 4 is engaged with the rack 3 and the drive assembly, the mating portion 91 contacts the first connecting rod 61 and / or the second connecting rod 62, thereby forming a dead point of force transmission with the operating assembly 6, so that the handle can remain in the locked state. Even if there is a large lateral force on the transmission gear 4, the handle will not be accidentally unlocked, and the stability is good. In this embodiment, see Figure 4 and Figure 5 When the transmission gear 4 is engaged with the rack 3 and the driving assembly, the matching portion 91 contacts the second connecting rod 62. In this embodiment, the matching portion 91 is a convex block, and the free end of the convex block is arc-shaped.

[0084] In order to facilitate the operator to operate the operating component 6, the operating component 6 can be exposed to the housing 1. Specifically, the housing 1 outside the operating component 6 has a hollow operating window 14, which can be selectively covered with a sticker, or an opening and closing component can be set to cover the operating window 14.

[0085] See also Figure 13The gear link 5 includes a distal end 51 and a proximal end 52, wherein the distal end 51 has a receiving area 511 for accommodating the transmission gear 4, and the transmission gear 4 is arranged in the receiving area 511 by pivoting. The proximal end 52 is arranged in the housing 1 by pivoting, and the above-mentioned first connecting rod 61 is connected to the proximal end 52, and the second rotation axis b between the first connecting rod 61 and the gear link 5 is located outside the first rotation axis a. When the handle is converted from the locked state to the unlocked state, the angle γ between the plane where the first rotation axis a and the second rotation axis b are located and the axis of the rack 3 (the axis of the rack 3 extends along the x direction) gradually decreases (see Figure 5 and Figure 10 Preferably, when the handle is in the locked state, the angle γ between the plane where the first rotation axis a and the second rotation axis b are located and the axis of the rack 3 is approximately 90°, specifically 90°±5°.

[0086] Furthermore, the end surface of the proximal portion 52 away from the distal portion 51 is a proximal end surface 521 , which is a plane. A groove 522 is formed on the outer side of the proximal portion 52 .

[0087] The handle further comprises a retaining assembly 7, which is mainly used to keep the transmission gear 4 disconnected from the rack 3 and / or the drive assembly, even if the handle remains in an unlocked state.

[0088] Specifically, see Figure 2 and Figure 5 The holding assembly 7 includes a holding hook 71 and a torsion spring 72 that are rotatably arranged in the housing 1 around the fifth rotation axis e. One end arm of the torsion spring 72 is fixedly arranged in the housing 1, and the other end arm is fixedly connected to the holding hook 71. When the handle is in the locked state, see Figure 5 , keep the hook 71 against the proximal end surface 521 of the gear connecting rod 5; when the handle is in the unlocked state, see Figure 10 , the hook portion 711 of the hook 71 is kept inserted into the groove 522 of the proximal end portion 52 of the gear connecting rod 5, so that the distal end portion 51 of the gear connecting rod 5 has a tendency to move outward.

[0089] Furthermore, the groove 522 of the proximal portion 52 has a mating surface 523 that matches the hook portion 711 of the retaining hook 71. Preferably, the mating surface 523 is a plane to facilitate insertion and disengagement of the hook.

[0090] The handle also includes a retraction assembly. The retraction assembly is connected to the rack 3. When the transmission gear 4 is disconnected from the rack 3 and / or the drive assembly, the retraction assembly can be operated to move the rack 3 forward or backward.

[0091] Specifically, see Figure 1 、 Figure 3The retraction assembly includes a retraction rod 8, which is fixedly connected to the rack 3 and extends at one end from the housing 1. The housing 1 has a slide groove 13 extending along the front-to-back direction x. The retraction rod 8 is located in the slide groove 13 and can slide in the slide groove 13. Preferably, the retraction rod 8 has a handle at one end extending from the housing 1 for easy pulling by the operator. The shape of the handle can be set according to needs and is not specifically limited.

[0092] The handle also includes a frame 9 fixedly mounted within the housing 1. The frame 9 extends in the front-to-back direction x and does not interfere with the rack 3. The gear connecting rod 5, operating assembly 6, retaining assembly 7, and mating portion 91 are respectively mounted on the frame 9. Furthermore, the frame 9 is positioned between the rack 3, the gear connecting rod 5, the operating assembly 6, the retaining assembly 7, and the mating portion 91.

[0093] The housing 1 includes a first shell 11 and a second shell 12 that are detachably connected, wherein an operation window 14 is located on the first shell 11 , and a slide groove 13 is formed between the first shell 11 and the second shell 12 and located in the middle portion above the housing 1 .

[0094] The above-mentioned stapler or handle has at least the following advantages:

[0095] 1) Simple and labor-saving operation: By radially disengaging the transmission gear from the rack and motor gear, there is no huge friction caused by lateral force during axial movement. At the same time, the design of the first connecting rod and the second connecting rod can amplify the force. The user can easily pull out the first connecting rod to disengage the transmission gear from the motor gear and rack, making it easier to manually pull back the rack and cutting knife.

[0096] 2) High reliability: In the locked state, the dead point of force transmission is formed by the cooperation of the operating component, the gear connecting rod and the mating part. Even if there is a large lateral force on the transmission gear, the device will not be accidentally unlocked.

[0097] 3) Automatic locking: After the transmission gear is disengaged, it can be automatically locked in the disengaged position, which is convenient for manual operation to pull back the rack, while avoiding the risk of a faulty instrument being used again.

[0098] 4) Low production cost: The structure adopts multiple connecting rods, which is simple to manufacture, easy to install and has low cost.

[0099] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A handle with a manual reset mechanism, comprising: case; A drive assembly, disposed on the housing; a transmission assembly, comprising a transmission gear provided on the housing and a rack extending in a front-to-rear direction, the transmission gear being operably connected to the drive assembly and the rack, respectively, the transmission gear being capable of rotating forward or reversely about its axis under the drive of the drive assembly and driving the rack forward or backward, the axis of the transmission gear extending in a top-to-bottom direction; It is characterized in that: the handle also includes a manual reset mechanism, and the manual reset mechanism includes: a gear connecting rod, the gear connecting rod being rotatably disposed in the housing about a first rotation axis, the first rotation axis being parallel to the axis of the transmission gear, one end of the gear connecting rod being connected to the transmission gear; The gear connecting rod is connected to the gear wheel of the transmission gear, and the gear connecting rod is connected to the gear wheel of the transmission gear and the transmission gear of the transmission gear. The gear connecting rod is connected to the gear wheel of the transmission gear and the transmission gear of the transmission gear. The gear connecting rod is connected to the gear wheel of the transmission gear and the transmission gear of the transmission gear. The gear connecting rod is connected to the gear wheel of the transmission gear and the transmission gear of the transmission gear. The gear connecting rod is connected to the gear wheel of the transmission gear and the transmission gear of the transmission gear. A retraction assembly is connected to the rack. When the transmission gear is disconnected from the rack and / or the driving assembly, operating the retraction assembly can cause the rack to move forward or backward.

2. The handle according to claim 1, characterized in that: The manual reset mechanism also includes a mating portion fixedly arranged in the housing, the mating portion is located between the rack and the operating assembly, and when the transmission gear is in a connected state with the rack and the drive assembly, the mating portion contacts the first connecting rod and / or the second connecting rod.

3. The handle according to claim 1, characterized in that: When the transmission gear is converted from a state of being connected to the rack and the drive assembly to a state of being disconnected from the rack and / or the drive assembly, the angle between the plane where the first rotation axis and the second rotation axis are located and the axis of the rack gradually decreases.

4. The handle according to claim 1, characterized in that: One end portion of the gear connecting rod has a receiving area for receiving the transmission gear, and the transmission gear is rotatably disposed in the receiving area.

5. The handle according to claim 1, characterized in that: The manual reset mechanism further comprises a retaining assembly for maintaining the transmission gear in a disconnected state from the rack and / or the drive assembly.

6. The handle according to claim 5, characterized in that: The holding assembly includes a holding hook and a torsion spring rotatably arranged in the housing around a fifth rotation axis, one end arm of the torsion spring is fixedly arranged in the housing, and the other end arm is fixedly connected to the holding hook; When the transmission gear is in a connected state with the rack and the drive assembly, the retaining hook is abutted against the end face of the other end of the gear connecting rod; when the transmission gear is in a disconnected state with the rack and / or the drive assembly, the hook portion of the retaining hook is inserted into the groove at the other end of the gear connecting rod, and makes one end of the gear connecting rod tend to move outward, and the groove is located on the outer side of the other end of the gear connecting rod, and the groove has a mating surface adapted to the hook portion of the retaining hook.

7. The handle according to claim 1, characterized in that: The retraction assembly includes a retraction rod, which is fixedly connected to the rack and has one end extending out of the shell. The shell has a slide groove extending in the front-to-back direction. The retraction rod is located in the slide groove and can slide in the slide groove.

8. The handle according to claim 1, characterized in that: The handle further comprises a frame arranged in the housing, and the gear connecting rod, the operating assembly, and the holding assembly are respectively mounted on the frame; and / or, The housing has a hollow operation window, the operation window is located on the housing outside the operation component, and the operation window is covered with a sticker or not; and / or, The drive assembly includes a motor with a motor gear. The motor is located below the rack and the rotation axis of the motor gear is parallel to the rotation axis of the transmission gear. The transmission gear is located on the side of the rack, which has a tooth surface. When the transmission gear is connected to the drive assembly and the rack, the transmission gear meshes with the tooth surfaces of the motor gear and the rack respectively.

9. A stapler comprising a working head, characterized in that: The stapler further comprises a handle according to any one of claims 1 to 8, and the working head is connected to the handle.

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