Manual wrench assembly, manual knife return device and electric anastomat

Abstract

The utility model discloses a hand-operated wrench assembly, a hand-operated knife return device and an electric anastomat, the hand-operated wrench assembly comprises a hand-operated wrench handle, a hand-operated wrench shaft sleeve and a hand-operated wrench rotating shaft, and the hand-operated knife return device comprises a hand-operated wrench assembly, a knife return gear shaft, a knife return transmission gear, a motor gear and a rack. The tool retracting gear shaft and the tool retracting transmission gear can be driven to move upwards by rotating the manual wrench assembly, the tool retracting transmission gear is separated from the motor gear, the rack can be driven to retract through the tool retracting transmission gear by continuously rotating the manual wrench assembly, manual tool retracting is achieved, and the electric anastomat comprises a manual tool returning device. By means of the mode, when the electric gear is rotated upwards through the lower half section of the wrench assembly, the middle section of the wrench is kept static, the tool retracting transmission gear can be easily pulled out, the wrench is further used as a torsion input tool after being pulled out, manual tool retracting is achieved, operation difficulty and failure risks are reduced, large torque is generated with small force, and the tool retracting transmission gear can be pulled out easily. And rapid manual tool retracting is achieved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a manual wrench assembly, a manual retraction device, and an electric stapler. Background Technology

[0002] Electric staplers are commonly used instruments in surgical procedures, especially in minimally invasive surgeries such as laparoscopy. Electric staplers use titanium screws to sever or anastomose tissue, offering simple and rapid operation, significantly reducing surgical time, and can replace traditional manual suturing.

[0003] When an electric stapler is cutting thick human tissue, if the motor's power is insufficient or malfunctions, it may jam. In this situation, the jaws of the stapler clamp the human tissue, and the cutting blade remains trapped inside, preventing the anastomosis surgery from continuing and causing significant pain for the patient. In such cases, the cutting blade must be removed from the human tissue immediately; delaying removal can easily lead to medical accidents.

[0004] In the industry, the process of safely removing a cutting blade stuck in the human body is called "blade retraction". Many staplers on the market have manual blade retraction methods, which mostly involve pulling it out directly or manually turning the gears on the stapler to achieve the purpose of blade retraction. This can easily damage the stapler, making it impossible to remove the cutting blade from the patient's tissue, which is very dangerous.

[0005] Furthermore, in some manual retraction mechanisms, the retraction drive gear disengages from the motor gear via a spring, but this spring or manual operating mechanism has inherent flaws:

[0006] The operation is relatively complex and prone to failure, which can cause the stapler to malfunction and fail to retract properly. In addition, the spring-loaded operation and manual operation mechanism can make operation difficult. When the resistance is too great, it is easy to fail to retract the stapler manually, which poses a certain risk. Utility Model Content

[0007] The main technical problem solved by this utility model is to provide a manual wrench assembly and a manual return device that utilizes a principle similar to a jack so that when the lower half of the manual wrench assembly rotates the electric gear upward, the middle part of the wrench remains stationary, thereby easily pulling out the retraction transmission gear. After being pulled out, the wrench further serves as a torque input tool, realizing manual retraction of the blade. The manual return device is then applied to an electric stapler.

[0008] This segmented method of disengaging the retraction drive gear from the electric gear is more labor-saving than directly pulling the retraction drive gear upwards. It effectively avoids the risk of the surgeon not having enough strength to manually retract the blade when there is too much resistance during the operation, and it will not damage the stapler, thus improving the success rate of the anastomosis surgery.

[0009] To solve the above-mentioned technical problems, the present invention provides a manual wrench assembly, comprising:

[0010] The manual wrench handle has a knob and an insertion hole;

[0011] Manual wrench bushing with a shaft hole;

[0012] The manual wrench shaft has a first section, a second section, and a third section formed in one piece;

[0013] The first section of the manual wrench shaft is inserted into the insertion hole of the manual wrench handle, the second section of the manual wrench shaft is fitted into the shaft hole of the manual wrench bushing, and the third section of the manual wrench shaft is configured to pass through the shaft hole of the manual wrench bushing, and the tail of the third section is provided with an external thread.

[0014] In a preferred embodiment of the present invention, the first section of the manual wrench shaft has symmetrically arranged plug-in blocks, which are inserted into the insertion hole.

[0015] In a preferred embodiment of the present invention, a transition end plate is provided at the connection position of the first and second sections of the manual wrench shaft, and an arc-shaped flange is provided at the top port position of the manual wrench bushing. The bottom surface of the transition end plate and the surface of the arc-shaped flange contact each other to form a line fit.

[0016] In a preferred embodiment of the present invention, the tail of the manual wrench bushing has at least three circumferentially distributed limiting ribs, which can limit the rotation of the manual wrench bushing.

[0017] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is: providing a manual tool return device, including: a tool return gear shaft, a tool return transmission gear, a motor gear, a rack, and the aforementioned manual wrench assembly. The tool return gear shaft has a through hole, and the inner wall surface of the head of the through hole has an internal thread. The third section of the manual wrench shaft is threadedly connected to the tool return gear shaft. The tool return transmission gear is fitted onto the tool return gear shaft, and the tool return transmission gear meshes with the motor gear and the rack.

[0018] When the manual wrench handle is turned, the manual wrench bushing remains stationary. The manual wrench shaft drives the retraction gear shaft to rotate, thereby driving the retraction transmission gear to move upward until it disengages from the motor gear.

[0019] Once the retraction drive gear and the motor gear are completely disengaged, the manual wrench assembly and the retraction gear shaft become one unit. Continuing to rotate the manual wrench handle causes the retraction drive gear and the rack to fully mesh, and the rack moves backward under the drive of the retraction drive gear.

[0020] In a preferred embodiment of the present invention, a gear fixing shaft is also installed in the through hole of the retraction gear shaft. The gear fixing shaft extends downward and contacts the motor bracket. A gear pad that cooperates with the retraction transmission gear is fitted on the gear fixing shaft.

[0021] In a preferred embodiment of this utility model, both the external thread and the internal thread are double-start threads. The thread start end of the external thread is provided with a first anti-rotation end face, and the thread tail end of the internal thread is provided with a second anti-rotation end face. When the first anti-rotation end face contacts the second anti-rotation end face, the retraction transmission gear disengages from the motor gear.

[0022] In a preferred embodiment of the present invention, the tail end of the retraction gear shaft is provided with an anti-rotation boss, and the tail end of the inner cavity of the retraction transmission gear is provided with an anti-rotation groove. The anti-rotation groove and the anti-rotation boss cooperate to limit the relative rotation of the retraction gear shaft and the retraction transmission gear.

[0023] In a preferred embodiment of this utility model, the anti-rotation boss is a hexagonal boss larger than the outer diameter of the retraction gear shaft, and the anti-rotation groove is an internal hexagonal groove larger than the inner diameter of the retraction transmission gear.

[0024] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is: to provide an electric stapler, including: a handle assembly, a rotating head, a barrel assembly, a stapler assembly, and a cutting blade. The distal end of the stapler assembly forms a jaw capable of clamping tissue. The jaw is provided with a cutting blade capable of cutting tissue when the jaw is closed. It also includes the aforementioned manual blade return device. When the electric gear cannot drive the rack to continue moving forward, the manual blade return device can drive the rack to move backward, and the cutting blade also moves backward under the drive of the rack.

[0025] The beneficial effects of this utility model are: when the electric gear is turned upward by the lower half of the manual wrench assembly, the middle part of the wrench remains stationary, so that the tool retraction transmission gear can be easily pulled out. After being pulled out, the wrench can be further used as a torque input tool to realize manual tool retraction.

[0026] This segmented method of disengaging the retraction drive gear from the electric gear is more labor-saving than directly pulling the retraction drive gear upwards. It effectively avoids the risk of the surgeon not having enough strength to manually retract the blade when there is too much resistance during the operation, and it will not damage the stapler, thus improving the success rate of the anastomosis surgery. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0028] Figure 1 This is a schematic diagram of a preferred embodiment of the manual wrench assembly of this utility model;

[0029] Figure 2 This is a schematic diagram of a preferred embodiment of the handle of the present utility model;

[0030] Figure 3 This is a schematic diagram of a preferred embodiment of the manual wrench shaft of this utility model;

[0031] Figure 4 This is a schematic diagram of a preferred embodiment of the manual wrench bushing of this utility model;

[0032] Figure 5 This is a cross-sectional view of a preferred embodiment of the manual wrench assembly of this utility model;

[0033] Figure 6 This is a schematic diagram of a preferred embodiment of the retraction gear shaft of this utility model;

[0034] Figure 7 This is an enlarged structural schematic diagram of the internal thread portion of the retraction gear shaft of this utility model;

[0035] Figure 8 This is an enlarged structural schematic diagram of the external threaded portion of the manual wrench shaft of this utility model;

[0036] Figure 9 This is a cross-sectional view of a preferred embodiment of the manual retraction device of the present invention, showing the retraction transmission gear.

[0037] Figure 10 This is a schematic diagram of the structure of the manual wrench shaft and the retraction gear shaft of this utility model when they start to rotate;

[0038] Figure 11 This is a schematic diagram of the structure when the anti-rotation end face one of the external thread of the manual wrench shaft of this utility model contacts the anti-rotation end face two of the internal thread of the retraction gear shaft.

[0039] Figure 12 This is a schematic diagram of the structure of the tool retraction transmission gear of this utility model when it has not disengaged from the motor gear;

[0040] Figure 13 This is a schematic diagram of the structure of the tool retraction transmission gear of this utility model when it disengages from the motor gear;

[0041] Figure 14 This is a schematic diagram of a preferred embodiment of the handle assembly in the electric anastomosis device of this utility model;

[0042] Figure 15 This is a schematic diagram of the handle assembly of the electric stapler after the manual cover is opened;

[0043] Figure 16 This is a schematic diagram of the structure of the electric stapler of this utility model, in which the manual wrench assembly is installed behind the handle assembly;

[0044] Figure 17 This is a schematic diagram of a preferred embodiment of the electric stapler of this utility model;

[0045] The components in the attached diagram are labeled as follows:

[0046] 1. Handle wrench handle; 1-1. Knob; 1-2. Insertion hole; 2. Manual wrench shaft; 2-1. First section; 2-2. Second section; 2-3. Third section; 2-4. External thread; 2-4-1. Anti-rotation end face one; 2-5. Insertion locking block; 2-6. Transition end plate.

[0047] 3. Manual wrench bushing; 3-1. Shaft hole; 3-2. Restricting rib; 3-3. Arc-shaped flange; 4. Manual cover plate; 5. Rotating head; 6. Motor bracket; 7. Barrel assembly; 8. Handle assembly; 9. Lower clamp plate; 10. Manual wrench assembly.

[0048] 11. Retracting gear shaft; 11-1. Through hole; 11-2. Internal thread; 11-2-1. Anti-rotation end face two; 11-3. Anti-rotation boss; 12. Retracting transmission gear; 12-1. Anti-rotation groove; 13. Gear pad; 14. Gear fixing shaft; 15. Rack; 16. Motor gear; 17. Anastomosing device assembly; 17-1. Attachment cartridge assembly; 17-2. Anchor seat assembly. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Example 1

[0051] Please see Figure 1-5 This embodiment provides a manual wrench assembly suitable for the manual return device of a stapler, including a manual wrench shaft 2, a manual wrench handle 1 and a manual wrench bushing 3 connected to the manual wrench shaft 2.

[0052] Specifically, firstly, there is a manual wrench handle 1, which has a knob part 1-1 and an insertion hole 1-2; secondly, there is a manual wrench shaft 2, which has an integrally formed first section 2-1, second section 2-2 and third section 2-3; and thirdly, there is a manual wrench bushing 3, which has a through shaft hole 3-1.

[0053] Specifically, the first section 2-1 of the manual wrench shaft 2 has symmetrically arranged insertion blocks 2-5, which are inserted into the insertion hole 1-2; the second section 2-1 of the manual wrench shaft 2 is installed in the shaft hole 3-1 of the manual wrench bushing 3; the third section 2-3 of the manual wrench shaft 2 is configured to pass through the shaft hole 3-1 of the manual wrench bushing 3, and the tail of the third section 2-3 is provided with an external thread 2-4.

[0054] Furthermore, a transition end plate 2-6 is provided at the connection position of the first section 2-1 and the second section 2-2 of the manual wrench shaft 2, and an arc-shaped flange 3-3 is provided at the top port position of the manual wrench bushing 3. The bottom surface of the transition end plate 2-6 and the surface of the arc-shaped flange 3-3 are in contact to form a line fit.

[0055] When the manual wrench shaft 2 rotates under external force, the bottom surface of the transition end plate 2-6 comes into contact with the top port of the manual wrench sleeve 3. This contact causes the manual wrench shaft 2 to exert pressure on the manual wrench sleeve 3. Therefore, an arc-shaped flange 3-3 is provided at the top port of the manual wrench sleeve 3, which enables the bottom surface of the transition end plate 2-6 to form a line fit with the top port of the manual wrench sleeve 3. This line fit helps to reduce the frictional resistance of the manual wrench assembly 10 during rotation, improving the efficiency and comfort of using the manual wrench.

[0056] In addition, the tail of the manual wrench bushing 3 has at least three circumferentially distributed limiting ribs 3-2, which can limit the rotation of the manual wrench bushing.

[0057] The aforementioned manual wrench assembly can be installed inside the handle housing of the stapler. A lower clamping plate 9 is provided inside the top cover of the handle housing. A limiting groove 9-1 can be provided on the lower clamping plate 9. The aforementioned limiting rib 3-2 is inserted into the limiting groove 9-1 to restrict the rotation of the manual wrench bushing 3 when the manual wrench shaft 2 rotates relative to the retraction gear shaft 11, ensuring that the manual wrench bushing 3 remains stationary when the manual wrench shaft 2 rotates relative to the retraction gear shaft 11. Example 2

[0058] Please see Figure 6-13 Based on the manual wrench assembly of Embodiment 1, this embodiment provides a manual retraction device, including: a retraction gear shaft 11, a retraction transmission gear 12, a motor gear 16, a rack 15, and a manual wrench assembly 10.

[0059] In detail, the retraction gear shaft 11 is provided with a through hole 11-1, and the inner wall surface of the head of the through hole 11-1 is provided with an internal thread 11-2. The third section 2-3 of the manual wrench shaft 2 is threadedly connected to the retraction gear shaft 11. The retraction transmission gear 12 is fitted on the retraction gear shaft 11 and is meshed with the motor gear 16 and the rack 15.

[0060] When the manual wrench handle 1 is turned, the manual wrench bushing 3 remains stationary, and the manual wrench shaft 2 drives the retraction gear shaft 11 to rotate, thereby driving the retraction transmission gear 12 to move upward until it disengages from the motor gear 16;

[0061] After the retraction drive gear 12 and the motor gear 16 are completely disengaged, the manual wrench assembly and the retraction gear shaft 11 are connected as one unit. When the manual wrench handle 1 is rotated, the retraction drive gear 12 and the rack 15 are fully engaged, and the rack 15 moves backward under the drive of the retraction drive gear 12.

[0062] Furthermore, a gear fixing shaft 14 is also installed in the through hole 11-1 of the retraction gear shaft 11. The gear fixing shaft 14 extends downward and contacts the motor bracket 6. A gear pad 13 that cooperates with the retraction transmission gear 12 is fitted on the gear fixing shaft 14. The gear pad 13 provides accurate positioning and stable support for the retraction transmission gear 12 installed on it, ensuring that the retraction transmission gear 12 will not deviate during rotation.

[0063] Furthermore, both the external thread 2-4 and the internal thread 11-2 are double-start threads. The thread start end of the external thread 2-4 is provided with an anti-rotation end face 2-4-1, and the thread end of the internal thread 11-2 is provided with an anti-rotation end face 11-2-1.

[0064] When the external thread 2-4 and the internal thread 11-2 begin to contact, the manual wrench shaft 2 is threadedly engaged with the retraction gear shaft 11, and the manual wrench shaft 2 rotates relative to the retraction gear shaft 11. At the same time, the retraction gear shaft 11 and the retraction transmission gear 12 that engages with the retraction gear shaft 11 begin to move gradually upward under the drive of the manual wrench shaft 2.

[0065] When the anti-rotation end face 2-4-1 of the external thread 2-4 contacts the anti-rotation end face 11-2-1 of the internal thread 11-2, the retraction gear shaft 11 drives the retraction transmission gear 12 to move upward to a certain height and disengage from the motor gear 16.

[0066] At this time, continue to rotate the manual wrench shaft 2, and the retraction gear shaft 11 will continue to rotate with the manual wrench shaft 2. The retraction transmission gear 12 and the retraction gear shaft 11 rotate synchronously. The retraction transmission gear 12 drives the rack 15 to retract, thereby realizing the retraction of the tool.

[0067] The initial design of this structure was to directly use the tail screw of the manual wrench assembly 10 to unscrew the retraction drive gear 12 and disengage it from the motor gear 16. However, because the two gears were tightly meshed, the retraction drive gear 12 could not be pulled out at all, and the manual wrench assembly 10 tended to move downwards.

[0068] To easily and effortlessly disengage the retraction drive gear from the motor gear, the manual wrench assembly 10 is designed in three sections. The bottom section rotates while the middle section remains stationary, providing excellent support. With the help of the support force and the upward spiral pull, the retraction drive gear 12 is moved upward and completely separated from the motor gear 16.

[0069] This segmented method of disengaging the retraction drive gear 16 from the electric gear 12 is more labor-saving than directly pulling the retraction drive gear 12 upwards. It effectively avoids the risk of the surgeon not having enough strength to manually retract the blade when the resistance is too great during the operation, and it will not damage the stapler, thus improving the success rate of the anastomosis surgery.

[0070] Furthermore, the tail end of the retraction gear shaft 11 is provided with an anti-rotation boss 11-3, and the tail end of the inner cavity of the retraction transmission gear 13 is provided with an anti-rotation groove 12-1, such as... Figure 9 As shown, the anti-rotation groove 12-1 cooperates with the anti-rotation boss 11-3 to limit the relative rotation of the retraction gear shaft 11 and the retraction transmission gear 12.

[0071] The shapes of the aforementioned anti-rotation boss 11-3 and anti-rotation groove 12-1 are not limited to hexagonal shapes, but can also be square, triangular, etc. They are not limited to specific forms. The key is that they can effectively achieve the anti-rotation effect.

[0072] Preferably, the anti-rotation boss 11-3 is a hexagonal boss larger than the outer diameter of the retraction gear shaft 11, and the anti-rotation groove 12-1 is an internal hexagonal groove larger than the inner diameter of the retraction transmission gear 12, which occupies less space and can maintain a good anti-rotation effect.

[0073] In this embodiment, the manual retraction device utilizes the external thread 2-4 on the manual wrench shaft 2 to engage with the internal thread 11-2 on the retraction gear shaft 11. This fixes the axial movement of the manual wrench shaft 2 while preserving its rotational movement, thereby driving the retraction gear shaft 11 and the retraction transmission gear 12 to gradually move upward. First, the retraction transmission gear 12 is unscrewed and disengaged from the motor gear 16. Then, the torque is transmitted from the manual wrench shaft 2 to the retraction transmission gear 12 using the stop of the threaded engagement. This enables the manual retraction transmission gear 12 to drive the rack 15 to retract, thus retracting the tool.

[0074] The manual retraction device in this embodiment uses a threaded retraction method, which requires less effort than pulling it out directly. This effectively avoids the risk that the surgeon may not have enough strength to manually retract the blade when there is excessive resistance during the operation. Example 3

[0075] Please see Figure 14-17 Based on the manual retraction device of Embodiment 2, this embodiment provides an electric stapler, including: a handle assembly 8, a rotating head 5, a barrel assembly 7, a stapler assembly 17, a cutting blade, and a manual retraction device. The manual retraction device is mounted on the handle assembly 8. The rotating head 5 is rotatably connected to the handle assembly 8. The rear end of the barrel assembly 7 is connected to the rotating head 5, and the front end of the barrel assembly 7 is connected to the stapler assembly 17.

[0076] The stapler assembly 17 includes a staple cartridge assembly 17-1 and an anvil assembly 17-2. The distal ends of the staple cartridge assembly 17-1 and the anvil assembly 17-2 form jaws 18 capable of clamping tissue. The jaws 18 are provided with a cutting blade capable of cutting tissue when the jaws 18 are closed.

[0077] The retraction process of the electric stapler of this utility model is as follows:

[0078] First, turn the manual wrench handle 1 counterclockwise. The manual wrench shaft 2 will only rotate under the limit of the manual wrench shaft sleeve 3. The manual wrench shaft 2 rotates relative to the retraction gear shaft 11 and drives the retraction gear shaft 11 to move upward.

[0079] The retraction gear shaft 11 and the retraction transmission gear 12 cooperate to drive the retraction transmission gear 12 to rise together. After rising to a certain height, the retraction transmission gear 12 disengages from the motor gear 16. At this time, the anti-rotation end face 2-4-1 of the external thread 2-4 of the manual wrench shaft 2 contacts the anti-rotation end face 11-2-1 of the internal thread 11-2 of the retraction gear shaft 11.

[0080] Then continue to rotate the manual wrench handle 1 counterclockwise. The manual wrench shaft 2 and the retraction gear shaft 11 rotate counterclockwise together. The retraction gear shaft 11 and the retraction transmission gear 12 cooperate to drive the retraction transmission gear 12 to rotate counterclockwise synchronously. The retraction transmission gear 12 drives the rack 15 to retract, which in turn drives the cutting blade in the jaws to retract and the jaws to open, thus realizing manual retraction.

[0081] The beneficial effects of this utility model of a manual wrench assembly, a manual blade return device, and an electric stapler are:

[0082] Using a principle similar to a jack, the lower half of the manual wrench assembly keeps the middle part of the wrench stationary while the electric gear is turned upwards, thus easily pulling out the tool retraction drive gear. After being pulled out, the wrench further serves as a torque input tool to achieve manual tool retraction.

[0083] This segmented method of disengaging the retraction drive gear from the electric gear is more labor-saving than directly pulling the retraction drive gear upwards. It effectively avoids the risk that the surgeon will not have enough strength to manually retract the blade when the resistance is too great during the operation, and it will not damage the stapler, thus improving the success rate of the anastomosis operation.

[0084] The threaded structure helps to gradually reduce resistance during rotation, lowering the difficulty of operation and the risk of failure. It also helps medical staff generate greater torque with less force, enabling rapid manual retraction of the blade.

[0085] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A manual wrench assembly, characterized in that, include: The manual wrench handle has a knob and an insertion hole; Manual wrench bushing with a shaft hole; The manual wrench shaft has a first section, a second section, and a third section formed in one piece; The first section of the manual wrench shaft is inserted into the insertion hole of the manual wrench handle, the second section of the manual wrench shaft is fitted into the shaft hole of the manual wrench bushing, and the third section of the manual wrench shaft is configured to pass through the shaft hole of the manual wrench bushing, and the tail of the third section is provided with an external thread.

2. The manual wrench assembly according to claim 1, characterized in that, The first section of the manual wrench shaft has symmetrically arranged plug-in blocks that are inserted into the insertion hole.

3. The manual wrench assembly according to claim 1, characterized in that, A transition end plate is provided at the connection position of the first and second sections of the manual wrench shaft, and an arc-shaped flange is provided at the top port of the manual wrench bushing. The bottom surface of the transition end plate and the surface of the arc-shaped flange are in contact to form a line fit.

4. The manual wrench assembly according to claim 3, characterized in that, The manual wrench bushing has at least three circumferentially distributed limiting ribs at its tail end, which can limit the rotation of the manual wrench bushing.

5. A manual retraction device, characterized in that, include: The tool retraction gear shaft, the tool retraction transmission gear, the motor gear, the rack, and the manual wrench assembly as described in claim 4. The retraction gear shaft has a through hole with an internal thread on the inner wall of the head of the through hole. The third section of the manual wrench shaft is threadedly connected to the retraction gear shaft. The retraction drive gear is fitted onto the retraction gear shaft and meshes with the motor gear and rack. When the manual wrench handle is turned, the manual wrench bushing remains stationary. The manual wrench shaft drives the retraction gear shaft to rotate, thereby driving the retraction transmission gear to move upward until it disengages from the motor gear. Once the retraction drive gear and the motor gear are completely disengaged, the manual wrench assembly and the retraction gear shaft become one unit. Continuing to rotate the manual wrench handle causes the retraction drive gear and the rack to fully mesh, and the rack moves backward under the drive of the retraction drive gear.

6. The manual retraction device according to claim 5, characterized in that, A gear fixing shaft is also installed inside the through hole of the retraction gear shaft. The gear fixing shaft extends downward and contacts the motor bracket. A gear pad block that mates with the retraction transmission gear is fitted on the gear fixing shaft.

7. The manual retraction device according to claim 5, characterized in that, Both the external and internal threads are double-start threads. The thread start end of the external thread is provided with a first anti-rotation end face, and the thread end end of the internal thread is provided with a second anti-rotation end face. When the first anti-rotation end face contacts the second anti-rotation end face, the tool retraction transmission gear disengages from the motor gear.

8. The manual retraction device according to claim 7, characterized in that, The tail end of the retraction gear shaft is provided with an anti-rotation boss, and the tail end of the inner cavity of the retraction transmission gear is provided with an anti-rotation groove. The anti-rotation groove and the anti-rotation boss cooperate to limit the relative rotation between the retraction gear shaft and the retraction transmission gear.

9. The manual retraction device according to claim 8, characterized in that, The anti-rotation boss is a hexagonal boss larger than the outer diameter of the retraction gear shaft, and the anti-rotation groove is an internal hexagonal groove larger than the inner diameter of the retraction transmission gear.

10. An electric stapler, comprising: The device comprises a handle assembly, a rotating head, a barrel assembly, a stapler assembly, and a cutting blade. The distal end of the stapler assembly forms jaws capable of clamping tissue, and a cutting blade is provided within the jaws to cut the tissue when the jaws are closed. The device is characterized in that... It also includes a manual retraction device as described in any one of claims 5-9, wherein when the electric gear cannot drive the rack to continue moving forward, the manual retraction device can drive the rack to move backward, and the cutting blade also moves backward under the drive of the rack.

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