Manual back-cutter device and electric anastomat

Abstract

The application discloses a kind of manual back knife device and electric anastomat, including manual wrench assembly and retraction component, manual wrench assembly includes manual wrench handle, manual wrench shaft sleeve and manual wrench pivot, retraction component includes retraction gear shaft, retraction transmission gear, motor gear and rack, by rotating manual wrench assembly can drive retraction gear shaft and retraction transmission gear upward movement, and make retraction transmission gear disengage motor gear, continue to rotate manual wrench assembly can be driven by retraction transmission gear rack back, realize manual retraction.By the above mode, the manual back knife device and electric anastomat of the application keep the middle section of the wrench static when the lower half of the wrench assembly rotates the electric gear upward, so that the retraction transmission gear can be easily pulled out, and the wrench further serves as a torque input tool after pulling out, achieving manual retraction, avoiding the risk of being unable to manually retract the knife when the resistance is too large during the operation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to 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 removal." Currently, electric staplers on the market are often removed manually (by directly turning the blade by hand or by manually turning the gears backward) or by forcefully pulling it out (using tweezers, pliers, or other tools). This can easily damage the stapler, making it impossible to remove the cutting blade from the patient's tissue, which is extremely dangerous.

[0005] In addition, some return-cutting structures disengage the retraction drive gear from the motor gear by springing it open. However, the spring-loaded return-cutting structure also has its drawbacks: it is relatively complicated to operate, prone to failure, and can cause the stapler to lose control and fail to retract normally. Moreover, the spring force operation is laborious, and when the resistance is too great, it is easy to fail to retract manually, which poses a certain risk. Summary of the Invention

[0006] The main technical problem solved by this invention is to provide a manual retraction device and an electric stapler. Utilizing a principle similar to a jack, the lower half of the manual wrench assembly keeps the middle section stationary while the electric gear is turned upwards. This allows for easy pulling out of the retraction drive gear. After being pulled out, the wrench further functions as a torque input tool, enabling manual retraction. 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 insufficient strength for manual retraction due to excessive resistance during surgery, and does not damage the stapler, thus improving the success rate of anastomosis surgery.

[0007] To solve the above-mentioned technical problems, the present invention provides a manual retraction device, including a manual wrench assembly and a retraction assembly. The manual wrench assembly can rotate counterclockwise, thereby driving the retraction assembly to move upward. The manual wrench assembly includes a manual wrench handle, a manual wrench bushing, and a manual wrench shaft. The retraction assembly includes a retraction gear shaft, a retraction transmission gear, a motor gear, and a rack. The manual wrench handle and the manual wrench bushing are configured to be connected to the head section and the middle section of the manual wrench shaft, respectively. The tail section of the manual wrench shaft is threadedly connected to the retraction gear shaft. The retraction transmission gear is fitted onto the retraction gear shaft and meshes with the motor gear and the rack. When the manual wrench handle is rotated, the manual wrench bushing remains stationary, and 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.

[0008] 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.

[0009] In a preferred embodiment of the present invention, the manual wrench handle includes a handle grip portion and an insertion portion, the insertion portion having an insertion hole, and the head section of the manual wrench shaft having a plug-in block, the plug-in block being inserted into the insertion hole, so that the manual wrench shaft and the manual wrench handle move synchronously.

[0010] In a preferred embodiment of the present invention, the manual wrench bushing includes a shaft hole, and the middle section of the manual wrench shaft is configured to be installed in conjunction with the shaft hole.

[0011] In a preferred embodiment of the present invention, the manual wrench assembly and the blade retraction assembly are installed inside the handle housing of the stapler. A lower clamping plate is provided inside the top cover of the handle housing. The lower clamping plate is provided with a limiting groove. The bottom end of the manual wrench bushing is provided with a limiting rib. The limiting rib and the limiting groove match so that when the manual wrench shaft rotates relative to the blade retraction gear shaft, the rotation of the manual wrench bushing can be restricted.

[0012] In a preferred embodiment of the present invention, a transition end plate is provided at the connection position between the head section and the middle section 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.

[0013] In a preferred embodiment of the present invention, the tail section of the manual wrench shaft is provided with an external thread, and the retraction gear shaft has a through hole with an internal thread on the inner wall surface of the head of the through hole. The tail section of the manual wrench shaft is configured to pass through the shaft hole of the manual wrench bushing and be threadedly connected to the retraction gear shaft, so that the manual wrench shaft can rotate relative to the retraction gear shaft and drive the retraction gear shaft to move gradually upward.

[0014] In a preferred embodiment of the present invention, 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.

[0015] 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.

[0016] In a preferred embodiment of the present invention, the anti-rotation boss can be a hexagonal boss larger than the outer diameter of the retraction gear shaft, and the anti-rotation groove can be an internal hexagonal groove larger than the inner diameter of the retraction transmission gear.

[0017] 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 block that cooperates with the retraction transmission gear is fitted on the gear fixing shaft.

[0018] To solve the above-mentioned technical problems, another technical solution adopted by the present invention is: to provide an electric stapler, including: a handle assembly, a rotating head, a barrel assembly, a stapler assembly, and a cutting blade. The rotating head is rotatably connected to the handle assembly. The rear end of the barrel assembly is connected to the rotating head, and the front end of the barrel assembly is connected to the stapler assembly. The stapler assembly includes a staple cartridge assembly and an anvil assembly. The distal ends of the staple cartridge assembly and the anvil assembly form jaws capable of clamping tissue. A cutting blade capable of cutting tissue when the jaws are closed is provided inside the jaws. The device also includes the aforementioned manual blade return mechanism. When the electric gear cannot drive the rack to continue moving forward, the manual blade return mechanism can drive the rack to move backward, and the cutting blade also moves backward under the drive of the rack.

[0019] The beneficial effects of this invention are as follows: when the lower half of the manual wrench assembly rotates the electric gear upwards, the middle section of the wrench remains stationary, thereby easily pulling out the retraction drive gear. After being pulled out, the wrench further serves as a torque input tool to achieve manual retraction of the blade. 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 cause damage to the stapler, thus improving the success rate of the anastomosis surgery. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 This is a schematic diagram of a preferred embodiment of the manual return device manual wrench assembly of the present invention;

[0022] Figure 2 This is a schematic diagram of a preferred embodiment of the manual retraction device handle of the present invention;

[0023] Figure 3 This is a schematic diagram of a preferred embodiment of the manual retraction device manual wrench shaft of the present invention;

[0024] Figure 4 This is a schematic diagram of a preferred embodiment of the manual retraction device manual wrench bushing of the present invention;

[0025] Figure 5 This is a cross-sectional view of a preferred embodiment of the manual retraction device manual wrench assembly of the present invention;

[0026] Figure 6 This is a schematic diagram of a preferred embodiment of the manual retraction device retraction gear shaft of the present invention;

[0027] Figure 7 This is an enlarged structural schematic diagram of the internal thread portion of the retraction gear shaft of the manual retraction device of the present invention;

[0028] Figure 8 This is an enlarged structural schematic diagram of the external threaded portion of the manual wrench shaft of the manual retraction device of the present invention;

[0029] Figure 9 This is a cross-sectional view of a preferred embodiment of the manual retraction device retraction transmission gear of the present invention;

[0030] Figure 10This is a schematic diagram of the structure of the manual retraction device of the present invention when the manual wrench shaft and the retraction gear shaft rotate;

[0031] Figure 11 This is a schematic diagram of the structure when the anti-rotation end face one of the external thread of the manual retraction device of the present invention is in contact with the anti-rotation end face two of the internal thread.

[0032] Figure 12 This is a schematic diagram of the structure of the electric stapler of the present invention when the retraction drive gear has not disengaged from the motor gear;

[0033] Figure 13 This is a schematic diagram of the structure of the electric stapler of the present invention when the retraction drive gear disengages from the motor gear;

[0034] Figure 14 This is a schematic diagram of a preferred embodiment of the handle assembly in the electric stapler of the present invention;

[0035] Figure 15 This is a schematic diagram of the handle assembly of the electric stapler of the present invention after the manual cover is opened;

[0036] Figure 16 This is a schematic diagram of the structure of the electric stapler of the present invention, in which the manual wrench assembly is installed after the handle assembly;

[0037] Figure 17 This is a schematic diagram of a preferred embodiment of the electric stapler of the present invention;

[0038] The components in the attached diagram are labeled as follows:

[0039] 1. Handle wrench handle; 1-1. Handle grip; 1-2. Insertion part; 1-3. Insertion hole; 2. Manual wrench shaft; 2-1. Head section; 2-2. Middle section; 2-3. Tail section; 2-4. External thread; 2-4-1. Anti-rotation end face one; 2-5. Insertion locking block; 2-6. Transition end plate.

[0040] 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; 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

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0043] The present invention relates to a preferred embodiment of a manual retraction device.

[0044] like Figure 1-16 As shown, the manual retraction device includes a manual wrench assembly 10 and a retraction assembly. The manual wrench assembly 10 can rotate counterclockwise, thereby driving the retraction assembly to move upward.

[0045] Specifically, the first component is the manual wrench assembly 10, which includes a manual wrench handle 1, a manual wrench bushing 3, and a manual wrench shaft 2; the second component is the tool retraction assembly, which includes a tool retraction gear shaft 11, a tool retraction transmission gear 12, a motor gear 16, and a rack 15.

[0046] Based on the above, the manual wrench handle 1 and the manual wrench bushing 3 are configured to be connected to the head section 2-1 and the middle section 2-2 of the manual wrench shaft 2. The manual wrench handle 1 can rotate relative to the manual wrench bushing 3. The tail 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. The retraction transmission gear 12 is meshed with the motor gear 16 and the rack 15.

[0047] When the manual wrench assembly 10 drives the retraction gear shaft 11 to rise to a certain height, the retraction transmission gear 12 disengages from the motor gear 16; when the manual wrench assembly 10 drives the retraction gear shaft 11 to continue rising, the retraction transmission gear 12 drives the rack 15 to retract.

[0048] More specifically, such as Figure 1-5 As shown, the manual wrench handle 1 includes a handle gripping part 1-1 and an insertion part 1-2. The insertion part 1-2 has an insertion hole 1-3. The head section 2-1 of the manual wrench shaft 2 has a plug-in block 2-5, which is inserted into the insertion hole 1-3, so that the manual wrench shaft 2 and the manual wrench handle 1 move synchronously.

[0049] Furthermore, the manual wrench bushing 3 includes a shaft hole 3-1, and the middle section 2-2 of the manual wrench shaft 2 is configured to be fitted into the shaft hole 3-1. A transition end plate 2-6 is provided at the connection position between the head section 2-1 and the middle section 2-2 of the manual wrench shaft 2. In addition, an arc-shaped flange 3-3 is provided at the top port of the manual wrench bushing 3, and the bottom surface of the transition end plate 2-6 contacts the surface of the arc-shaped flange 3-3 to form a line fit.

[0050] When the manual wrench shaft 2 is rotated by an external force, the bottom surface of the transition end plate 2-6 of the head section 2-1 will come into contact with the top port of the manual wrench bushing 3. This contact causes the manual wrench shaft 2 to exert pressure on the manual wrench bushing 3. Therefore, an arc-shaped flange 3-3 is provided at the top port of the manual wrench bushing 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 bushing 3. This line fit helps to reduce the frictional resistance of the manual wrench assembly 10 during rotation, and improves the efficiency and comfort of using the manual wrench.

[0051] Furthermore, the tail section of the manual wrench shaft 2 is provided with an external thread 2-4, and the retraction gear shaft 11 has a through hole 11-1. The inner wall surface of the head of the through hole 11-1 is provided with an internal thread 11-2. The tail 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 be threadedly connected to the retraction gear shaft 11, so that the manual wrench shaft 2 can rotate relative to the retraction gear shaft 11 and drive the retraction gear shaft 11 to move gradually upward.

[0052] like Figure 6-13 As shown, 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.

[0053] When the external thread 2-4 and the internal thread 11-2 begin to contact, 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 cooperates with the retraction gear shaft 11 begin to move gradually upward under the drive of the manual wrench shaft 2.

[0054] 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.

[0055] 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.

[0056] The initial design of this invention 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.

[0057] To easily and effortlessly disengage the retraction drive gear from the motor gear, the present invention designs the manual wrench assembly 10 into three sections. The bottom section rotates while the middle section remains stationary, providing excellent support. With the help of the supporting force and the upward spiral pull, the retraction drive gear 12 is moved upward and completely separated from the motor gear 16.

[0058] 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 operation.

[0059] More specifically, 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 between the retraction gear shaft 11 and the retraction transmission gear 12.

[0060] 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.

[0061] 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.

[0062] Furthermore, the manual wrench assembly 10 and the blade retraction assembly are installed inside the handle housing of the stapler. A lower clamping plate 9 is provided inside the top cover of the handle housing. The lower clamping plate 9 is provided with a limiting groove 9-1. The bottom end of the manual wrench bushing 3 is provided with a limiting rib 3-2. The 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 blade retraction gear shaft 11, thus ensuring that the manual wrench bushing 3 remains stationary when the manual wrench shaft 2 rotates relative to the blade retraction gear shaft 11.

[0063] In addition, a gear fixing shaft 14 is 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.

[0064] The gear pad 13 provides accurate positioning and stable support for the retraction drive gear 12 mounted thereon, ensuring that the retraction drive gear 12 will not deviate during rotation.

[0065] The manual retraction device of the present invention uses an external manual wrench to directly pull out the retraction transmission gear. After being pulled out, the wrench further serves as a torque input tool to achieve manual retraction.

[0066] Wrenches enable the transmission of force more effectively, especially in situations requiring greater torque. Through the lever principle, doctors or technicians can generate greater torque with less force, making it easier to move or rotate the retractor gear shaft. The contact surface of a wrench is usually designed to be smooth and uniform, which helps to distribute force and reduce local stress concentration. Using a wrench can reduce damage to surrounding tissues. In addition, the threaded structure requires less effort and helps to gradually reduce resistance during rotation, reducing the difficulty of operation and the risk of failure.

[0067] The present invention also relates to a preferred embodiment of an electric stapler.

[0068] like Figure 14-17 As shown, the electric stapler includes a handle assembly 8, a rotating head 5, a barrel assembly 7, a stapler assembly 17, and a cutting blade. 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. 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. A cutting blade is provided inside the jaws 18, which can cut tissue when the jaws 18 are closed.

[0069] The electric stapler also includes the manual retraction device, which is mounted on the handle assembly 8. The retraction drive gear 12 can gradually move upward under the control of the manual wrench assembly 10 until it disengages from the motor gear 16. Then, under the control of the manual wrench assembly 10, the retraction drive gear 12 drives the rack 15 to retract, thereby driving the cutting blade in the jaws to retract, thus realizing manual retraction.

[0070] The retraction operation of the electric stapler of this invention is as follows: Figure 10-13 As shown:

[0071] 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.

[0072] 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.

[0073] 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 retraction rack 15 to retract, thereby driving the cutting blade in the jaws to retract and the jaws to open, thus realizing manual retraction.

[0074] The advantages of the manual retraction device and electric stapler of this invention are:

[0075] 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.

[0076] 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.

[0077] A wrench can transmit force more effectively, allowing medical staff to generate greater torque with less force, making it easier to move or rotate the retractor gear shaft;

[0078] The use of threaded structures helps to gradually reduce resistance during rotation, thereby reducing the difficulty of operation and the risk of failure.

[0079] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A manual retraction device, characterized in that, The utility model relates to a hand crank assembly and a tool bit withdrawing assembly, The hand crank assembly comprises a hand crank handle, a hand crank shaft sleeve and a hand crank shaft, and the tool bit withdrawing assembly comprises a tool bit withdrawing gear shaft, a tool bit withdrawing transmission gear, a motor gear and a rack gear; The hand crank handle and the hand crank shaft sleeve are arranged to be connected to the head section and the middle section of the hand crank shaft, the tail section of the hand crank shaft is threadedly connected to the tool bit withdrawing gear shaft, the tool bit withdrawing transmission gear is sleeved on the tool bit withdrawing gear shaft, and the tool bit withdrawing transmission gear is engaged with the motor gear and the rack gear at the same time; When the hand crank handle is rotated, the hand crank shaft sleeve remains static, the hand crank shaft drives the tool bit withdrawing gear shaft to rotate, thereby driving the tool bit withdrawing transmission gear to move upwards until the tool bit withdrawing transmission gear is disengaged from the motor gear. When the tool bit withdrawing transmission gear and the motor gear are completely disengaged, the hand crank assembly and the tool bit withdrawing gear shaft are integrated, the hand crank handle is continuously rotated, the tool bit withdrawing transmission gear and the rack gear are completely engaged, and the rack gear is driven by the tool bit withdrawing transmission gear to move backwards. The hand crank handle comprises a handle holding part and an insertion part, the insertion part is provided with an insertion hole, the head section of the hand crank shaft is provided with an insertion block which is inserted into the insertion hole, and the hand crank shaft and the hand crank handle are kept synchronous movement.

2. The manual return device of claim 1, wherein The hand crank shaft sleeve comprises a shaft hole, and the middle section of the hand crank shaft is arranged to be matched and installed with the shaft hole.

3. The manual return device of claim 1, wherein The hand crank assembly and the tool bit withdrawing assembly are installed in the handle shell of an anastomat, a lower clamping plate is arranged in the top cover plate of the handle shell, the lower clamping plate is provided with a limiting groove, the bottom end of the hand crank shaft sleeve is provided with a limiting rib, the limiting rib is matched with the limiting groove, and when the hand crank shaft and the tool bit withdrawing gear shaft are relatively rotated, the rotation of the hand crank shaft sleeve can be limited.

4. The manual return device of claim 1, wherein The transition end plate is arranged at the joint position of the head section and the middle section of the hand crank shaft, the top end of the hand crank shaft sleeve is provided with an arc-shaped flange, and the bottom surface of the transition end plate is in surface contact with the arc-shaped flange to form linear cooperation.

5. The manual return device of claim 1, wherein The tail section of the hand crank shaft is provided with external threads, the tool bit withdrawing gear shaft is provided with a through hole, the inner wall surface of the head section of the through hole is provided with internal threads, the tail section of the hand crank shaft is arranged to pass through the shaft hole of the hand crank shaft sleeve and is threadedly connected to the tool bit withdrawing gear shaft, and the hand crank shaft can be relatively rotated with the tool bit withdrawing gear shaft and drives the tool bit withdrawing gear shaft to gradually move upwards.

6. The manual return device of claim 3, wherein The external threads and the internal threads are double-headed threads, the thread head end of the external threads is provided with a rotation-stopping end surface one, the thread tail end of the internal threads is provided with a rotation-stopping end surface two, the tool bit withdrawing transmission gear is disengaged from the motor gear when the rotation-stopping end surface one is in contact with the rotation-stopping end surface two.

7. The manual return device of claim 6, wherein The tail end of the tool bit withdrawing gear shaft is provided with a rotation-stopping boss, and the tail end of the inner cavity of the tool bit withdrawing transmission gear is provided with a rotation-stopping groove which is matched with the rotation-stopping boss and is used for limiting the relative rotation of the tool bit withdrawing gear shaft and the tool bit withdrawing transmission gear.

8. The manual return device of claim 7, wherein, The rotation-stopping boss is a hexagonal boss which is larger than the outer diameter of the tool bit withdrawing gear shaft, and the rotation-stopping groove is an internal hexagonal groove which is larger than the inner diameter of the tool bit withdrawing transmission gear.

9. The manual return device of claim 8, wherein, ​ 10. The manual return device of claim 9, wherein, The gear fixing shaft is sleeved with a gear pad block matched with the tool-removing transmission gear.

11. An electrically powered anastomosis device comprising: The handle assembly, the rotating head, the barrel assembly, the stapler assembly and the cutting knife, the rotating head is rotatably connected with the handle assembly, the rear end of the barrel assembly is connected with the rotating head, the front end of the barrel assembly is connected with the stapler assembly, the stapler assembly comprises a staple cartridge assembly and a anvil assembly, the far end of the staple cartridge assembly and the anvil assembly forms a jaw capable of clamping and closing the tissue, the jaw is provided with a cutting knife capable of cutting the tissue when the jaw is closed, and the stapler assembly is characterized in that: The manual tool-removing device is also included, and when the motor gear cannot drive the rack to move forward, the manual tool-removing device can drive the rack to move backward, and the cutting knife also moves backward under the driving of the rack. The gear fixing shaft is sleeved with a gear pad block matched with the tool-removing transmission gear.

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