Manual knife returning device and electric anastomat

Abstract

The manual knife returning device comprises a manual wrench assembly and a knife retracting assembly, the manual wrench assembly comprises a manual wrench handle, a manual wrench shaft sleeve and a manual wrench rotating shaft, and the knife retracting assembly comprises a knife retracting gear shaft, a knife retracting 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, and manual tool retracting is achieved. 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, so that 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, and the labor intensity of workers is reduced. And the risk that the knife cannot be retracted manually when the resistance is too large in the operation process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a manual knife return device and an electric stapler. Background Art

[0002] Electric staplers are commonly used instruments in surgical operations, especially in minimally invasive surgeries such as laparoscopy. Electric staplers use titanium nails to separate or staple tissues. They are easy and quick to operate, greatly shortening the operation time and can replace traditional manual suturing.

[0003] When the electric stapler is cutting thicker human tissue, if the motor power is insufficient or the motor fails, it will get stuck. At this time, the jaws of the stapler clamp the human tissue and the cutting knife stays in the tissue and cannot be withdrawn. The anastomosis operation cannot continue and the patient is in great pain. In this case, the cutting knife needs to be removed from the human tissue immediately. If it takes too long, it is easy to cause medical accidents.

[0004] The industry calls the process of safely removing a cutting knife stuck in the human body "retracting the knife." Currently, electric staplers on the market are often retracted manually (directly by hand, or by moving the gear backwards) or by violent pulling out (using tweezers, pliers and other tools). This can easily damage the stapler and make the cutting knife unable to be removed from the patient's tissue, which is very dangerous.

[0005] In addition, in some knife return structures, the knife retraction transmission gear and the motor gear are disengaged by a spring that springs open to separate the knife retraction transmission gear from the motor gear. However, the spring knife return structure also has defects: the operation is relatively complicated and prone to failure, resulting in the stapler losing control and being unable to retract the knife normally. Moreover, the spring elastic force operation is laborious. When the resistance is too large, it is easy to become unable to retract the knife manually, which poses a certain risk. Summary of the invention

[0006] The main technical problem solved by the present invention is to provide a manual knife retraction device and an electric stapler, which utilizes a principle similar to that of a jack so that when the lower half of the manual wrench assembly rotates the electric gear upward, the middle section of the wrench remains stationary, thereby making it easy to pull out the knife retraction transmission gear. After being pulled out, the wrench is further used as a torque input tool to achieve manual knife retraction. This method of segmenting and using force to separate the knife retraction transmission gear from the electric gear is more labor-saving than directly pulling the knife retraction transmission gear upward, and effectively avoids the risk of the doctor's inability to manually retract the knife due to insufficient strength when the resistance is too large during the operation, and will not cause damage to the stapler, thereby improving the success rate of the anastomosis operation.

[0007] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a manual knife return device, including a manual wrench assembly and a knife retracting assembly, the manual wrench assembly can be rotated in the counterclockwise direction, thereby driving the knife retracting assembly to move upward, the manual wrench assembly includes a manual wrench handle, a manual wrench sleeve and a manual wrench rotating shaft, the knife retracting assembly includes a knife retracting gear shaft, a knife retracting transmission gear, a motor gear and a rack, the manual wrench handle and the manual wrench sleeve are configured to be connected to the head section and the middle section of the manual wrench rotating shaft, the tail section of the manual wrench rotating shaft is threadedly connected to the knife retracting gear shaft, the knife retracting transmission gear sleeve is mounted on the knife retracting gear shaft, the knife retracting transmission gear is meshed with the motor gear and the rack, when the manual wrench handle is rotated, the manual wrench sleeve remains stationary, the manual wrench rotating shaft drives the knife retracting gear shaft to rotate, thereby driving the knife retracting transmission gear to move upward until it is out of mesh with the motor gear; When the knife retracting transmission gear and the motor gear are completely disengaged, the manual wrench assembly and the knife retracting gear shaft are connected as one, and the manual wrench handle continues to be rotated, the knife retracting transmission gear and the rack are fully engaged, and the rack moves backwards driven by the knife retracting transmission gear.

[0008] In a preferred embodiment of the present invention, the manual wrench handle includes a handle gripping portion and an insertion portion, the insertion portion has an insertion hole, and the head section of the manual wrench shaft has an insert card block, which is inserted into the insertion hole, so that the manual wrench shaft and the manual wrench handle maintain synchronous movement.

[0009] In a preferred embodiment of the present invention, the manual wrench sleeve includes an axial hole, and the middle section of the manual wrench shaft is configured to match and install with the axial hole.

[0010] In a preferred embodiment of the present invention, the manual wrench assembly and the retraction assembly are installed in the handle housing of the stapler, and a lower clamping plate is arranged in the top cover plate of the handle housing, and a limiting groove is arranged on the lower clamping plate. A limiting rib is arranged on the bottom end of the manual wrench sleeve, and the limiting rib and the limiting groove match, so that the rotation of the manual wrench sleeve can be limited when the manual wrench shaft and the retraction gear shaft rotate relative to each other.

[0011] 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 sleeve, and the bottom surface of the transition end plate contacts the surface of the arc-shaped flange to form a linear fit.

[0012] In a preferred embodiment of the present invention, the tail section of the manual wrench shaft is provided with an external thread, the retracting gear shaft has a through hole, the inner wall surface of the through hole head is provided with an internal thread, and the tail section of the manual wrench shaft is arranged to pass through the axial hole of the manual wrench sleeve and then be threadedly connected with the retracting gear shaft, so that the manual wrench shaft can rotate relative to the retracting gear shaft and drive the retracting gear shaft to gradually move upward.

[0013] In a preferred embodiment of the present invention, the external thread and the internal thread are both double-start threads, the thread head end of the external thread is provided with a first stop-rotation end face, and the thread tail end of the internal thread is provided with a second stop-rotation end face, and when the first stop-rotation end face contacts the second stop-rotation end face, the retracting transmission gear is disengaged from the motor gear.

[0014] In a preferred embodiment of the present invention, a stop boss is provided at the rear end of the retracting gear shaft, and a stop groove is provided at the rear end of the inner cavity of the retracting transmission gear. The stop groove cooperates with the stop boss to limit the relative rotation of the retracting gear shaft and the retracting transmission gear.

[0015] In a preferred embodiment of the present invention, the anti-rotation boss can be a hexagonal boss larger than the outer diameter of the retracting gear shaft, and the anti-rotation groove can be an inner hexagonal groove larger than the inner diameter of the retracting transmission gear.

[0016] In a preferred embodiment of the present invention, a gear fixing shaft is also installed in the through hole of the retracting gear shaft, and the gear fixing shaft extends downward to contact and connect with the motor bracket. A gear pad that cooperates with the retracting transmission gear is mounted on the gear fixing shaft.

[0017] In order to solve the above 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 knife, 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 magazine assembly and a stapler seat assembly, the distal ends of the staple magazine assembly and the stapler seat assembly form jaws that can clamp tissue, the jaws are provided with a cutting knife that can cut tissue when the jaws are closed, and also include the manual knife return device, when the electric gear cannot drive the rack to continue to move forward, the manual knife return device can drive the rack to move backward, and the cutting knife also moves backward under the drive of the rack.

[0018] The beneficial effects of the present invention are as follows: when the lower half of the manual wrench assembly rotates the electric gear upward, the middle section of the wrench remains stationary, so that the knife retraction transmission gear can be easily pulled out. After being pulled out, the wrench is further used as a torque input tool to realize manual knife retraction; this segmented and leveraged method of separating the knife retraction transmission gear from the electric gear is more labor-saving than directly pulling the knife retraction transmission gear upward, effectively avoiding the risk of the doctor's lack of strength resulting in the inability to manually retract the knife when the resistance is too great during the operation, and will not cause damage to the stapler, thereby improving the success rate of the anastomosis operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 work, among which: Figure 1 It is a structural schematic diagram of a preferred embodiment of a manual wrench assembly of a manual knife return device of the present invention; Figure 2 It is a structural schematic diagram of a preferred embodiment of a wrench handle of a manual knife return device of the present invention; Figure 3 It is a structural schematic diagram of a preferred embodiment of a manual wrench shaft of a manual knife return device of the present invention; Figure 4 It is a structural schematic diagram of a preferred embodiment of a manual wrench sleeve of a manual knife return device of the present invention; Figure 5 It is a cross-sectional view of a preferred embodiment of a manual wrench assembly of a manual knife return device of the present invention; Figure 6 It is a structural schematic diagram of a preferred embodiment of the knife retracting gear shaft of the manual knife retracting device of the present invention; Figure 7 It is an enlarged structural schematic diagram of the internal threaded portion of the tool retracting gear shaft of the manual tool retracting device of the present invention; Figure 8 It is an enlarged structural schematic diagram of the external threaded portion of the manual wrench shaft of the manual knife return device of the present invention; Fig. 9 It is a cross-sectional view of a preferred embodiment of the knife retracting transmission gear of the manual knife retracting device of the present invention; Fig.10 It is a structural schematic diagram of the manual knife return device of the present invention when the manual wrench rotating shaft and the knife retracting gear shaft rotate; Fig.11 It is a schematic structural diagram of the manual knife return device of the present invention when the anti-rotation end face 1 of the external thread contacts the anti-rotation end face 2 of the internal thread; Fig.12It is a schematic structural diagram of the electric stapler of the present invention when the knife retraction transmission gear has not separated from the motor gear; Fig.13 It is a schematic diagram of the structure of the electric stapler of the present invention when the knife retracting transmission gear is separated from the motor gear; Fig.14 It is a structural schematic diagram of a preferred embodiment of a handle assembly in the electric stapler of the present invention; Fig.15 It is a schematic diagram of the structure of the handle assembly of the electric stapler of the present invention after the manual cover plate is opened; Fig.16 It is a schematic structural diagram of the electric stapler of the present invention after the manual wrench assembly is installed on the handle assembly; Fig.17 It is a structural schematic diagram of a preferred embodiment of the electric stapler of the present invention; The markings of the components in the accompanying drawings are as follows: 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. Stop end face 1, 2-5. Plug-in card block, 2-6. Transition end plate, 3. Manual wrench sleeve, 3-1. Shaft hole, 3-2. Limiting rib position, 3-3. Arc-shaped flange, 4. Manual cover plate, 5. Rotating head, 6. Motor bracket, 7. Barrel assembly, 8. Handle assembly, 9. Lower clamping plate, 10. Manual wrench assembly, 11. Retracting tool gear shaft, 11-1. Through hole, 11-2. Internal thread, 11-2-1. Second anti-rotation end face, 11-3. Anti-rotation boss, 12. Retracting tool transmission gear, 12-1. Anti-rotation groove, 13. Gear pad, 14. Gear fixing shaft, 15. Rack, 16. Motor gear, 17. Stapler assembly, 17-1. Nail magazine assembly, 17-2. Nail support assembly. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] 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 invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention relates to a preferred embodiment of a manual knife return device.

[0023] like Figure 1-16 As shown, the manual knife return device includes a manual wrench assembly 10 and a knife retracting assembly. The manual wrench assembly 10 can rotate in a counterclockwise direction to drive the knife retracting assembly to move upward. Specifically, the first is the manual wrench assembly 10, which includes a manual wrench handle 1, a manual wrench sleeve 3 and a manual wrench shaft 2; the second is the retracting assembly, which includes a retracting gear shaft 11, a retracting transmission gear 12, a motor gear 16 and a rack 15.

[0024] Based on the above content, the manual wrench handle 1 and the manual wrench sleeve 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 sleeve 3, the tail section 2-3 of the manual wrench shaft 2 is threadedly connected to the retracting gear shaft 11, the retracting transmission gear 12 is sleeved on the retracting gear shaft 11, and the retracting transmission gear 12 is meshed and connected with the motor gear 16 and the rack 15.

[0025] When the manual wrench assembly 10 drives the retracting gear shaft 11 to rise to a certain height, the retracting transmission gear 12 disengages from the motor gear 16; when the manual wrench assembly 10 drives the retracting gear shaft 11 to continue to rise, the retracting transmission gear 12 drives the rack 15 to retreat.

[0026] In more detail, Figure 1-5 As shown, the manual wrench handle 1 includes a handle gripping portion 1-1 and an insertion portion 1-2, the insertion portion 1-2 has an insertion hole 1-3, and the head section 2-1 of the manual wrench shaft 2 has an insertion card 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 maintain synchronous movement.

[0027] Furthermore, the manual wrench sleeve 3 includes an axial hole 3-1, and the middle section 2-2 of the manual wrench shaft 2 is configured to match and install with the axial 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, a circle of arc-shaped flange 3-3 is provided at the top port position of the manual wrench sleeve 3, and the bottom surface of the transition end plate 2-6 contacts with the surface of the arc-shaped flange 3-3 to form a line fit.

[0028] When the manual wrench shaft 2 is rotated by 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 sleeve 3. This contact causes the manual wrench shaft 2 to generate pressure on the manual wrench sleeve 3. Therefore, a circle of arc-shaped flange 3-3 is provided at the port at the top of the manual wrench sleeve 3, which can enable the bottom surface of the transition end plate 2-6 to form a linear fit with the top port of the manual wrench sleeve 3. This linear fit helps to reduce the friction resistance of the manual wrench assembly 10 during rotation, thereby improving the efficiency and comfort of using the manual wrench.

[0029] Furthermore, the tail section of the manual wrench shaft 2 is provided with an external thread 2-4, the retracting gear shaft 11 has 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 tail section 2-3 of the manual wrench shaft 2 is arranged to pass through the shaft hole 3-1 of the manual wrench sleeve 3 and then be threadedly connected with the retracting gear shaft 11, so that the manual wrench shaft 2 can rotate relative to the retracting gear shaft 11 and drive the retracting gear shaft 11 to gradually move upward.

[0030] like Figure 6-13 As shown, the external thread 2-4 and the internal thread 11-2 are both double-start threads, the thread head end of the external thread 2-4 is provided with a rotation-stopping end face 1 2-4-1, and the thread tail end of the internal thread 11-2 is provided with a rotation-stopping end face 2 11-2-1: When the external thread 2-4 starts to contact the internal thread 11-2, the manual wrench shaft 2 rotates relative to the retracting gear shaft 11, and at the same time, the retracting gear shaft 11 and the retracting transmission gear 12 matched with the retracting gear shaft 11 start to gradually move upward under the drive of the manual wrench shaft 2; When the anti-rotation end face 1 2-4-1 of the external thread 2-4 contacts the anti-rotation end face 2 11-2-1 of the internal thread 11-2, the retracting gear shaft 11 drives the retracting transmission gear 12 to move upward to a certain height and disengage from the motor gear 16; At this time, the manual wrench shaft 2 continues to rotate, the retracting gear shaft 11 will continue to rotate with the manual wrench shaft 2, the retracting transmission gear 12 and the retracting gear shaft 11 rotate synchronously, and the retracting transmission gear 12 drives the rack 15 to retract, thereby retracting the knife.

[0031] The initial design of the present invention is to directly use the tail screw of the manual wrench assembly 10 to screw out the knife retracting transmission gear 12 to disengage it from the motor gear 16. However, because the two gears are tightly engaged, the knife retracting transmission gear 12 cannot be pulled out at all. Instead, the manual wrench assembly 10 tends to move downward.

[0032] In order to easily and effortlessly separate the knife retracting transmission gear from the motor gear, the present invention designs the manual wrench assembly 10 into three sections. The bottom end rotates while the middle part remains stationary. The middle part provides good support, and the knife retracting transmission gear 12 is moved upward with the help of the supporting force and the upward spiral pulling force, and is completely separated from the motor gear 16.

[0033] This method of segmenting and using force to separate the knife retraction transmission gear 16 from the electric gear 12 is more labor-saving than directly pulling the knife retraction transmission gear 12 upwards. It effectively avoids the risk of the doctor's lack of strength and inability to manually retract the knife when the resistance is too great during the operation, and will not cause damage to the stapler, thereby improving the success rate of the anastomosis operation.

[0034] More specifically, the rear end of the retracting gear shaft 11 is provided with a rotation-stopping boss 11-3, and the rear end of the inner cavity of the retracting transmission gear 13 is provided with a rotation-stopping groove 12-1. Fig. 9 As shown, the anti-rotation groove 12 - 1 cooperates with the anti-rotation boss 11 - 3 to limit the relative rotation between the retracting gear shaft 11 and the retracting transmission gear 12 .

[0035] The shapes of the anti-rotation boss 11-3 and the anti-rotation groove 12-1 are not limited to hexagonal shapes, but can also be square, triangular, etc., and are not limited to specific forms. The key is to be able to effectively achieve the anti-rotation effect.

[0036] Preferably, the anti-rotation boss 11-3 is a hexagonal boss larger than the outer diameter of the retracting gear shaft 11, and the anti-rotation groove 12-1 is an inner hexagonal groove larger than the inner diameter of the retracting transmission gear 12, which occupies less space and can maintain a good anti-rotation effect.

[0037] In addition, the manual wrench assembly 10 and the retracting assembly are installed in the handle housing of the stapler, and a lower clamping plate 9 is arranged in the top cover plate of the handle housing. The lower clamping plate 9 is provided with a limit groove 9-1, and the bottom end of the manual wrench sleeve 3 is provided with a limit rib 3-2. The limit rib 3-2 is inserted into the limit groove 9-1, so that the rotation of the manual wrench sleeve 3 can be limited when the manual wrench shaft 2 and the retracting gear shaft 11 rotate relative to each other, ensuring that the manual wrench sleeve 3 remains stationary when the manual wrench shaft 2 and the retracting gear shaft 11 rotate relative to each other.

[0038] In addition, a gear fixing shaft 14 is installed in the through hole 11 - 1 of the retracting gear shaft 11 , and the gear fixing shaft 14 extends downward to contact and connect with the motor bracket 6 . A gear pad 13 that cooperates with the retracting transmission gear 12 is mounted on the gear fixing shaft 14 .

[0039] The gear pad 13 provides accurate positioning and stable support for the retracting transmission gear 12 mounted thereon, thereby ensuring that the retracting transmission gear 12 will not deviate during the rotation process.

[0040] The manual return device of the present invention uses an external manual wrench to directly pull out the tool retraction transmission gear. After being pulled out, the wrench is further used as a torque input tool to realize manual tool retraction.

[0041] The wrench enables it to transmit force more effectively, especially in situations where a larger torque is required. Through the principle of leverage, doctors or technicians can generate a larger torque with a smaller force, making it easier to move or rotate the retracting gear shaft. The contact surface of the wrench is usually smooth and uniform, which helps to disperse force and reduce local stress concentration. Using a wrench can reduce damage to surrounding tissues. In addition, the threaded structure saves more effort and helps to gradually reduce resistance during rotation, reducing the difficulty of operation and the risk of failure.

[0042] The present invention also relates to a preferred embodiment of an electric stapler.

[0043] 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 knife. 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 magazine assembly 17-1 and a staple support assembly 17-2. The distal ends of the staple magazine assembly 17-1 and the staple support assembly 17-2 form jaws 18 capable of clamping tissue, and the jaws 18 are provided with a cutting knife capable of cutting tissue when the jaws 18 are closed.

[0044] The electric stapler also includes the manual knife retracting device, which is installed on the handle assembly 8. The knife retracting transmission gear 12 can gradually move upward under the control of the manual wrench assembly 10 until it disengages from the motor gear 16. Then, the knife retracting transmission gear 12 drives the rack 15 to retract under the control of the manual wrench assembly 10, thereby driving the cutting knife in the jaws to retreat, thereby realizing manual knife retraction.

[0045] The knife retraction operation process of the electric stapler of the present invention is as follows: Figure 10-13 As shown: First, turn the manual wrench handle 1 counterclockwise, and the manual wrench shaft 2 only rotates under the limit of the manual wrench sleeve 3. The manual wrench shaft 2 rotates relative to the retracting gear shaft 11 and drives the retracting gear shaft 11 to move upward. The tool retracting gear shaft 11 cooperates with the tool retracting transmission gear 12 to drive the tool retracting transmission gear 12 to rise together. After rising to a certain height, the tool retracting transmission gear 12 is separated from the motor gear 16. At this time, the anti-rotation end face 1 2-4-1 of the external thread 2-4 of the manual wrench shaft 2 contacts the anti-rotation end face 2 11-2-1 of the internal thread 11-2 of the tool retracting gear shaft 11; Then continue to rotate the manual wrench handle 1 counterclockwise, the manual wrench shaft 2 and the retracting gear shaft 11 rotate counterclockwise together, the retracting gear shaft 11 cooperates with the retracting transmission gear 12 to drive the retracting transmission gear 12 to rotate counterclockwise synchronously, and the retracting transmission gear 12 drives the retracting rack 15 to retract, thereby driving the cutting knife in the jaws to retreat and the jaws to open, thereby realizing manual retracting.

[0046] The beneficial effects of the manual knife return device and the electric stapler of the present invention are: Using a principle similar to that of a jack, the middle section of the wrench remains stationary when the lower section of the manual wrench assembly rotates the electric gear upward, so that the tool retraction transmission gear can be easily pulled out. After being pulled out, the wrench is further used as a torque input tool to realize manual tool retraction. This method of separating the knife retraction transmission gear from the electric gear in sections and using force is more labor-saving than directly pulling up the knife retraction transmission gear, which effectively avoids the risk of the doctor not being able to manually retract the knife due to insufficient strength when the resistance is too great during the operation, and will not cause damage to the stapler, thereby improving the success rate of the anastomosis operation; The wrench can transmit force more efficiently, and medical staff can generate greater torque with less force, making it easier to move or rotate the retractor gear shaft; The use of a threaded structure helps to gradually reduce resistance during rotation, thereby lowering operational difficulty and the risk of failure.

[0047] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A manual knife return device, It is characterized in that include: Manual wrench assembly and retractor assembly, The manual wrench assembly includes a manual wrench handle, a manual wrench sleeve and a manual wrench rotating shaft, and the tool retracting assembly includes a tool retracting gear shaft, a tool retracting transmission gear, a motor gear and a rack; The manual wrench handle and the manual wrench sleeve are configured to be connected to the head section and the middle section of the manual wrench shaft, the tail section of the manual wrench shaft is threadedly connected to the retracting gear shaft, the retracting transmission gear is sleeved on the retracting gear shaft, and the retracting transmission gear is meshed with the motor gear and the rack at the same time; When the manual wrench handle is turned, the manual wrench sleeve remains stationary, and the manual wrench shaft drives the retracting gear shaft to rotate, thereby driving the retracting transmission gear to move upward until it is out of mesh with the motor gear; When the knife retracting transmission gear and the motor gear are completely disengaged, the manual wrench assembly and the knife retracting gear shaft are connected as one, and the manual wrench handle continues to be rotated, the knife retracting transmission gear and the rack are fully engaged, and the rack moves backwards driven by the knife retracting transmission gear.

2. The manual knife return device according to claim 1, It is characterized in that The manual wrench handle comprises a handle gripping portion and an inserting portion, wherein the inserting portion has an inserting hole, and the head section of the manual wrench shaft has an inserting card block, which is inserted into the inserting hole, so that the manual wrench shaft and the manual wrench handle keep synchronous movement.

3. The manual knife return device according to claim 1, It is characterized in that The manual wrench shaft sleeve comprises an axial hole, and the middle section of the manual wrench shaft is arranged to match and be installed with the axial hole.

4. The manual knife return device according to claim 1, It is characterized in that The manual wrench assembly and the retracting assembly are installed in the handle shell of the stapler. A lower clamping plate is arranged in the top cover plate of the handle shell. The lower clamping plate is provided with a limit groove. The bottom end of the manual wrench sleeve is provided with a limiting rib. The limiting rib and the limiting groove match, so that the rotation of the manual wrench sleeve can be limited when the manual wrench shaft and the retracting gear shaft rotate relative to each other.

5. The manual knife return device according to claim 1, It is characterized in that 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 sleeve. The bottom surface of the transition end plate contacts the surface of the arc-shaped flange to form a linear fit.

6. The manual knife return device according to claim 3, It is characterized in that The tail section of the manual wrench shaft is provided with an external thread, the retracting gear shaft has a through hole, the inner wall surface of the through hole head is provided with an internal thread, and the tail section of the manual wrench shaft is arranged to pass through the shaft hole of the manual wrench sleeve and then be threadedly connected with the retracting gear shaft, so that the manual wrench shaft can rotate relative to the retracting gear shaft and drive the retracting gear shaft to gradually move upward.

7. The manual knife return device according to claim 6, It is characterized in that The external thread and the internal thread are both double-start threads, the thread head end of the external thread is provided with a first stop-rotation end face, and the thread tail end of the internal thread is provided with a second stop-rotation end face. When the first stop-rotation end face contacts the second stop-rotation end face, the tool retraction transmission gear is disengaged from the motor gear.

8. The manual knife return device according to claim 7, It is characterized in that A rotation-stopping boss is provided at the tail end of the retracting gear shaft, and a rotation-stopping groove is provided at the tail end of the inner cavity of the retracting transmission gear. The rotation-stopping groove cooperates with the rotation-stopping boss to limit the relative rotation between the retracting gear shaft and the retracting transmission gear.

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

10. The manual knife return device according to claim 9, It is characterized in that A gear fixing shaft is also installed in the through hole of the tool retracting gear shaft, and the gear fixing shaft extends downward to contact and connect with the motor bracket. A gear pad matching the tool retracting transmission gear is sleeved on the gear fixing shaft.

11. An electric stapler, include: A handle assembly, a rotating head, a barrel assembly, a stapler assembly and a cutting knife, wherein 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, wherein the stapler assembly includes a staple cartridge assembly and an anvil assembly, wherein the distal ends of the staple cartridge assembly and the anvil assembly form jaws capable of clamping tissues, and a cutting knife capable of cutting tissues when the jaws are closed is provided in the jaws, wherein the stapler assembly includes a staple cartridge assembly and an anvil assembly, wherein the staple cartridge assembly and the anvil assembly include a stapler assembly and an anvil assembly, wherein the stapler assembly includes ... It also includes a manual knife return device as described in any one of claims 1-10. When the electric gear cannot drive the rack to continue to move forward, the manual knife return device can drive the rack to move backward, and the cutting knife also moves backward under the drive of the rack.

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