Electric anastomat capable of automatically matching nail bin length
By automatically identifying the staple cartridge length through the limit component and triggering mechanical braking at the end of the stroke, the problems of inconvenient operation and insufficient electrical reliability in existing electric staplers are solved. This achieves automatic matching and safe stopping of the staple cartridge length, improving the reliability and safety of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUNAN SIJIETECH MEDICAL TECH CO LTD
- Filing Date
- 2026-03-13
- Publication Date
- 2026-05-15
AI Technical Summary
Existing electric staplers have risks of inconvenience in the process of staple cartridge length identification and matching, loss or damage of the staples, and the control closed loop relies on circuit reliability that is insufficient and lacks mechanical overshoot protection.
The device employs a limit assembly, including a limit rod and an elastic plate, which automatically identifies the length of the staple cartridge through a mechanical structure and triggers a switch to cut off power and perform physical braking at the end of the staple cartridge's travel, ensuring a safe stop.
It achieves automatic matching and safe stopping of the staple cartridge length, simplifies the surgical preparation process, improves the reliability and safety of the system, and avoids mechanical overshoot caused by electrical failure.
Smart Images
Figure CN122031031A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electric stapler technology, and in particular to an electric stapler that automatically matches the length of the staple cartridge. Background Technology
[0002] In existing technologies, a common approach for electric staplers to identify and match the length of the staple cartridge is to include a near-field communication card with the cartridge. Before use, the operator must manually swipe the card in a specific reading area on the stapler's main unit to input information such as the cartridge's length and specifications into the stapler's control system. The system then uses this information to set the motor's expected stroke or output parameters, thereby controlling the movement distance of the pusher lever to match the cartridge length. While this approach introduces electronic identification, it still has significant drawbacks: it adds an extra card and operational steps (finding the card, aligning and swiping it), which is inconvenient in stressful surgical environments; the card is susceptible to loss, contamination, damage, or reading failure; and the entire control loop is highly dependent on the reliability of the circuitry, lacking a final physical guarantee against mechanical overshoot in the event of electrical system failure. Summary of the Invention
[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes an electric stapler that automatically matches the staple cartridge length, capable of automatically identifying and adapting to the staple cartridge length.
[0004] An electric stapler with automatic matching of staple cartridge length according to an embodiment of the present invention includes: a housing, a drive motor disposed inside the housing, a sleeve extending forward and backward at the front end of the housing, a push rod connected to the drive motor passing through the sleeve, a pull rod passing through the sleeve, a switch connected to the rear end of the pull rod, the switch being electrically connected to the drive motor, and the drive motor being used to drive the push rod to move forward and backward; The pusher housing has a rear end detachably connected to the front end of the sleeve. A pusher rod is inserted inside the pusher housing. A pusher positioning part is provided at the rear end of the pusher rod. A blade is provided at the front end of the pusher rod. The pusher rod can engage with the pusher positioning part, thereby driving the blade to move back and forth. A cutting assembly is connected to the front end of the pusher housing, the cutting assembly is connected to a staple cartridge, and the blade can move into the staple cartridge; A limiting component is disposed inside the pusher housing. When the pusher rod moves to the front end of its stroke, the limiting component can pull the pull rod forward to disconnect the switch, thereby stopping the drive motor. When the pusher rod moves to the front end of its stroke, the limiting component can also fix the pusher rod, so that the pusher rod stops moving forward.
[0005] An electric stapler with automatic matching of staple cartridge length according to an embodiment of the present invention has at least the following beneficial effects: When the push rod reaches the front end, that is, when the blade reaches the end of the staple cartridge stroke, the limiting component pulls the lever forward, triggering the switch to directly cut off the power to the drive motor. At the same time, the limiting component also fixes the push rod, forming a physical brake to prevent forward movement due to inertia or slow power cut-off. This double insurance effectively ensures the safety of the surgical operation. Through the limiting component, the system can automatically match the staple cartridge length in the cutting component. When the push rod reaches the end of its stroke, the drive motor automatically stops. The system can automatically identify and adapt the staple cartridge length through mechanical structure, simplifying the surgical preparation process.
[0006] According to some embodiments of the present invention, the limiting component includes a limiting rod that passes through the pusher housing. The rear end of the limiting rod is engaged with the pull rod. When the pusher rod moves to the front end of its stroke, the pusher positioning part drives the limiting rod forward, causing the limiting rod to pull the pull rod forward.
[0007] According to some embodiments of the present invention, a limiting protrusion is provided at the front end of the limiting rod, the limiting protrusion avoids the pusher rod in the front-back direction, and at least part of the projection of the limiting protrusion in the front-back direction coincides with the pusher positioning part.
[0008] According to some embodiments of the present invention, a hook is provided at the rear end of the limiting rod, and a locking interface is provided on the side of the pull rod. The hook can move with the pusher housing to a position aligned with the locking interface, and the rotation of the pusher housing can cause the hook to engage with the locking interface.
[0009] According to some embodiments of the present invention, the limiting component includes an elastic sheet, one end of which is fixed to the pusher housing, a plurality of slots are spaced apart on the side of the push rod, and a push plate is provided on the limiting rod. When the push plate moves forward, it can push the elastic sheet to deform and engage with the slots.
[0010] According to some embodiments of the present invention, a first guide portion and a second guide portion are provided inside the pusher housing, and a receiving hole extending in the front-rear direction is formed between the first guide portion and the second guide portion. The receiving hole allows the pusher rod to pass through and is used to guide the pusher positioning portion.
[0011] According to some embodiments of the present invention, a movable groove is formed between the first guide portion and the second guide portion, the movable groove being recessed to avoid the receiving hole in the front-rear direction, the rear end of the elastic sheet being located in the movable groove, and the front end of the elastic sheet being fixed to the inner wall of the movable groove.
[0012] According to some embodiments of the present invention, the front end of the elastic sheet is provided with a mounting post, the diameter of the mounting post is greater than the thickness of the elastic sheet, the first guide portion is provided with a first mounting hole for the mounting post to be inserted, and the second guide portion is provided with a second mounting hole for the mounting post to be inserted.
[0013] According to some embodiments of the present invention, the front end of the push plate is provided with a guide slope inclined toward the push rod, and the guide slope can push the rear end of the elastic sheet to move toward the push rod.
[0014] According to some embodiments of the present invention, the cutting assembly includes an anvil and a staple cartridge mounting part, the staple cartridge is mounted on the staple cartridge mounting part, the staple cartridge mounting part is disposed at the front end of the pusher housing, the anvil is hinged to the staple cartridge mounting part, the anvil and the staple cartridge cooperate to clamp tissue, and the blade can move forward to extend into the staple cartridge to cut tissue.
[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the overall installation structure according to an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of an embodiment of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of an embodiment of the present invention where an elastic sheet extends into a slot; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a schematic diagram of a first guide portion and a second guide portion according to an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view of point C in the middle; Figure 8 This is a schematic diagram of a limiting rod according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the fuselage casing according to an embodiment of the present invention; Figure 10 for Figure 9 Enlarged view of point D in the middle.
[0017] Icon labels: 100 housing, 110 drive motor, 120 sleeve, 130 push rod, 140 pull rod, 141 card interface, 150 switch; Pusher housing 200, pusher rod 210, slot 211, pusher positioning part 220, blade 230, first guide part 240, second guide part 250, movable groove 260; Cutting component 300, pin holder 310, pin cartridge mounting part 320; Staples 400; Limiting component 500, limiting rod 510, limiting protrusion 511, hook 512, push plate 513, guide slope 514, elastic sheet 520, mounting post 521. Detailed Implementation
[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.
[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.
[0020] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.
[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.
[0022] Reference Figures 1 to 6As shown, an embodiment of the present invention discloses an electric stapler with automatic matching of staple cartridge length, comprising: a body housing 100, a pusher housing 200, a cutting assembly 300, and a limiting assembly 500. A drive motor 110 is disposed within the body housing 100. A sleeve 120 extending forward and backward is provided at the front end of the body housing 100. A push rod 130, which is connected to the drive motor 110, passes through the sleeve 120. The mounting structure and connection method of the body housing 100, sleeve 120, drive motor 110, and push rod 130 are existing technologies and will not be described in detail. A pull rod 140 extends forward and backward along the sleeve 120. The structure of the pull rod 140 is similar to the control rod structure in the prior art that controls the bending angle of the cutting assembly 300 at the front end of the stapler. A switch 150 is connected to the rear end of the pull rod 140. The switch 150 is electrically connected to the drive motor 110, which drives the push rod 130 to move back and forth. The rear end of the pusher housing 200 is connected to the front end of the sleeve 120 via a rotating snap-fit. The connection method between the rear end of the pusher housing 200 and the sleeve 120 is existing technology and will not be described in detail. A pusher rod 210 is inserted inside the pusher housing 200 and extends in the front-back direction. The pusher rod 210 is formed by stacking multiple layers of elastic elongated metal sheets. A pusher positioning part 220 is provided at the rear end of the pusher rod 210, and a blade 230 is provided at the front end of the pusher rod 210. The push rod 130 can engage with the pusher positioning part 220. The connection method between the push rod 130 and the pusher positioning part 220 is a conventional technical means. The push rod 130 moves back and forth, thereby driving the blade 230 to move back and forth. The cutting assembly 300 is connected to the front end of the pusher housing 200, and the cutting assembly 300 is snapped into the staple cartridge 400. The blade 230 can move forward into the staple cartridge 400 and cut the tissue. Since the cutting assembly 300 is replaceable, and the stroke of the blade 230 in the replaced cutting assembly 300 varies according to the surgical needs, the drive motor 110 needs to be stopped when the blade 230 reaches the end of its stroke to prevent damage to the equipment. The limit assembly 500 is located inside the pusher housing 200. When the pusher rod 210 moves to the front end of its stroke, the limit assembly 500 can pull the pull rod 140 forward to disconnect the switch 150, thereby stopping the drive motor 110. When the pusher rod 210 moves to the front end of its stroke, the limit assembly 500 can also fix the pusher rod 130, stopping the pusher rod 130 from moving forward. Specifically, the switch 150 is either a pull-cord limit switch 150 or a limit switch 150. Switch 150 is electrically connected to a controller, which is electrically connected to drive motor 110. The controller is a common programmable logic controller (PLC). When switch 150 switches from closed to open, the controller stops drive motor 110. Furthermore, when switch 150 remains open, the controller interlocks to prevent drive motor 110 from rotating forward to move push rod 130; instead, the controller can only control drive motor 110 to rotate in the opposite direction to move push rod 130 backward.When the push rod 210 reaches its front end, i.e., when the blade 230 reaches the end of the stroke of the staple cartridge 400, the limiting component 500 pulls the lever 140 forward, triggering the switch 150 to directly cut off the power to the drive motor 110. Simultaneously, the limiting component 500 also fixes the push rod 130, forming a physical brake to prevent forward movement due to inertia or slow power cut-off. This double safety measure effectively ensures the safety of the surgical procedure. Through the limiting component 500, the system can automatically match the length of the staple cartridge 400 in the cutting component 300. When the push rod 210 reaches the end of its stroke, the drive motor 110 automatically stops. The system can automatically identify and adapt to the length of the staple cartridge 400 through its mechanical structure, simplifying the surgical preparation process.
[0023] Reference Figures 3 to 9 As shown, in some embodiments, the limiting component 500 includes a limiting rod 510, which passes through the pusher housing 200. The rear end of the limiting rod 510 is engaged with the pull rod 140. When the pusher rod 210 moves to the front end of its stroke, the pusher positioning part 220 can drive the limiting rod 510 forward, causing the limiting rod 510 to pull the pull rod 140 forward. The pusher positioning part 220 directly drives the limiting rod 510, resulting in a fast response speed, low susceptibility to electromagnetic interference, and high reliability, ensuring that the stop signal is transmitted to the drive motor 110 when the pusher rod 210 reaches its end point. The limiting rod 510 simultaneously performs two functions: position detection and motion transmission. The limiting rod 510 directly converts the position signal of the pusher rod 210 reaching its end point into the action of pulling the pull rod 140. Furthermore, by inserting the limiting rod 510 inside the pusher housing 200, the existing space is fully utilized, eliminating the need for additional installation positions for independent limiting sensors, making the anastomosis device design more compact.
[0024] Reference Figures 1 to 10 As shown, in some embodiments, the front end of the limiting rod 510 is integrally formed with a limiting protrusion 511. The limiting protrusion 511 avoids the pusher rod 210 in the front-back direction. During the front-back movement, the pusher rod 210 does not contact or rub against the limiting protrusion 511, thus avoiding wear or uncontrollable resistance caused by friction. The projected area of the pusher positioning part 220 in the front-back direction is larger than the projected area of the pusher rod 210 in the front-back direction. The projection of the limiting protrusion 511 in the front-back direction at least partially coincides with that of the pusher positioning part 220. Therefore, the trigger point is determined by the relative position of the pusher positioning part 220 and the limiting protrusion 511. For the cutting assembly 300 with different lengths of staple cartridges 400, the limiting protrusion 511 is appropriately set during production so that when the blade 230 moves forward to a distance of 3 to 4 mm from the midpoint, the pusher positioning part 220 and the limiting protrusion 511 just come into contact. The 3 to 4 mm margin is to allow for the travel of the lever 140 to pull the switch 150.
[0025] Reference Figures 1 to 10As shown, in some embodiments, a hook 512 is provided at the rear end of the limiting rod 510, and a locking interface 141 is provided on the side of the pull rod 140. The hook 512 can move with the pusher housing 200 to a position aligned with the locking interface 141. Rotation of the pusher housing 200 can cause the hook 512 to engage with the locking interface 141. By simply axially aligning and then rotating the pusher housing 200, the hook 512 at the rear end of the limiting rod 510 can be engaged with the locking interface 141 of the pull rod 140. In the existing design, the pusher housing 200 and the sleeve 120 are also connected by axial insertion and then rotation. Therefore, the connection between the limiting rod 510 and the pull rod 140 is completed at the same time as the connection between the pusher housing 200 and the sleeve 120, maintaining the same operation as the original stapler and reducing independent connection steps.
[0026] Reference Figures 3 to 10 As shown, in some embodiments, the limiting component 500 includes an elastic sheet 520, one end of which is fixed to the pusher housing 200. The push rod 130 has multiple slots 211 spaced apart on its side. The limiting rod 510 has a push plate 513. When the push plate 513 moves forward, it can push the elastic sheet 520 to deform and engage in the slots 211. The elastic sheet 520 is mechanically locked. Even if a circuit or motor malfunctions, when the pusher rod 210 reaches its travel end point, the elastic sheet 520 will be forcibly engaged in the slots 211 by the push plate 513, achieving physical locking. The push plate 513 and the limiting rod 510 are integrally formed, ensuring that the triggering timing of the mechanical locking of the elastic sheet 520 is completely synchronized with the timing of pulling the pull rod 140 and disconnecting the motor. The multiple slots 211 on the side of the push rod 130 ensure that when different models of staple cartridge 400 components are in place, one slot 211 will always move precisely to the corresponding position of the elastic sheet 520, thus achieving automatic adaptation to various staple cartridge 400 lengths.
[0027] Reference Figures 1 to 10 As shown, in some embodiments, the pusher housing 200 is cylindrical, and a first guide portion 240 and a second guide portion 250 are provided inside the pusher housing 200. Both the first guide portion 240 and the second guide portion 250 are semi-cylindrical extending in the front-back direction. The first guide portion 240 and the second guide portion 250 are made of plastic, which facilitates separate processing and assembly, and improves production feasibility and reliability. A receiving hole extending in the front-back direction is formed between the first guide portion 240 and the second guide portion 250. The receiving hole allows the pusher rod 210 to pass through and is used to guide the pusher positioning portion 220.
[0028] Reference Figures 1 to 10As shown, in some embodiments, a movable groove 260 is formed between the first guide portion 240 and the second guide portion 250. The movable groove 260 avoids the receiving hole in the front-rear direction. The rear end of the elastic piece 520 is located in the movable groove 260, and the elastic piece 520 can be pushed out of the movable groove 260 by the push plate portion 513. The front end of the elastic piece 520 is fixed to the inner wall of the movable groove 260. When the pusher rod 210 moves linearly in the receiving hole, it will not interfere with the elastic piece 520 located in the movable groove 260. The movable groove 260 defines the trajectory and range of the deformation and repositioning movement of the elastic piece 520.
[0029] Reference Figures 1 to 10 As shown, in some embodiments, the elastic sheet 520 has a mounting post 521 at its front end. The diameter of the mounting post 521 is larger than the thickness of the elastic sheet 520. The first guide portion 240 has a first mounting hole for the mounting post 521 to be inserted, and the second guide portion 250 has a second mounting hole for the mounting post 521 to be inserted. The thickened mounting post 521 is fixed by both the first and second mounting holes, forming a two-point alignment constraint. This eliminates the axial movement and radial sway that may occur at the root of the elastic sheet 520 during operation, ensuring that the starting point and reset position of each deformation of the elastic sheet 520 are the same. Furthermore, during final assembly, the mounting post 521 is simply inserted into the corresponding holes of the first and second guide portions 250 like a pin to complete the precise installation and fixation of the elastic sheet 520.
[0030] Reference Figures 1 to 10 As shown, in some embodiments, the front end of the push plate portion 513 is provided with a guide slope 514 inclined towards the push rod 130. The guide slope 514 can push the rear end of the elastic sheet 520 to move towards the push rod 130. The push plate portion 513 moves forward in a straight line with the limiting rod 510, while the elastic sheet 520 needs to generate lateral deformation towards the push rod 130 in order to be engaged in the slot 211. The inclined guide slope 514 can decompose and guide the horizontal forward pushing force of the push plate portion 513 into a lateral component force pointing towards the push rod 210, thereby driving the elastic sheet 520 to complete the required lateral displacement and deformation.
[0031] Reference Figures 1 to 10 As shown, in some embodiments, the cutting assembly 300 includes an anvil 310 and a staple cartridge mounting portion 320. The staple cartridge 400 is snap-fitted to the staple cartridge mounting portion 320, which is located at the front end of the pusher housing 200. The anvil 310 is hinged to the staple cartridge mounting portion 320. When the anvil 310 and the staple cartridge 400 are closed, the anvil 310 conforms to the contour of the tissue and closes parallel to the staple cartridge 400, forming a uniform and appropriate clamping pressure on the tissue. The blade 230 can move forward to extend into the staple cartridge 400 to cut the tissue. The specific structure of the cutting assembly 300 is prior art, so no major modifications to the production line are required during production, making it highly economically feasible.
[0032] Working principle: After the operator installs the pusher housing 200 with the staple cartridge 400 of a specific length, the pusher positioning part 220 at the rear end of the pusher rod 210 inside the pusher housing 200 automatically engages with the drive pusher rod 130 inside the machine body sleeve. At the same time, the rotation of the pusher housing 200 causes the hook 512 at the rear end of the limiting rod 510 to lock into place with the locking interface 141 on the side of the pull rod 140. During the procedure, when closing the instrument, the anvil 310 rotates around the hinge axis, cooperating with the staple cartridge 400 to evenly clamp the tissue. After the operator presses the button connected to the controller, the controller supplies power to the drive motor 110. The drive motor 110 operates, pushing the pusher rod 130 forward. The pusher rod 130 then drives the pusher rod 210 and the blade 230 at the front end to move smoothly forward in the guide hole formed by the first guide part 240 and the second guide part 250. The blade 230 eventually extends into the staple cartridge 400. While cutting the clamped tissue, the staples in the staple cartridge 400 are simultaneously pushed out and bent into shape, completing the cutting and anastomosis. When the pusher rod 210 moves to 3 to 4 mm from the front end of its stroke, the pusher positioning part 220 just begins to push the limit rod 510 forward. The limit rod 510 pulls the pull rod 140 forward, thereby triggering the switch 150. The controller cuts off the power to the drive motor 110, achieving braking. At the same time, the push plate part 513 on the limit rod 510 pushes the rear end of the elastic piece 520 through the guide slope 514, causing the elastic piece 520 to deform and the front end of the elastic piece 520 to be locked into the corresponding slot 211 on the side of the pusher rod 130, forming a mechanical lock. This double protection ensures that the pusher rod 210 and the blade 230 stop immediately in the precise position. The entire process realizes automatic recognition of the length of the staple cartridge 400 and automatic safe stopping at the end of the stroke.
[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.
Claims
1. An electric stapler that automatically matches the length of the staple cartridge, characterized in that, include: The machine body has a housing, inside which a drive motor is installed. The front end of the housing has a sleeve that extends forward and backward. A push rod that is connected to the drive motor passes through the sleeve. A pull rod passes through the sleeve. A switch is connected to the rear end of the pull rod. The switch is electrically connected to the drive motor. The drive motor is used to drive the push rod to move forward and backward. The pusher housing has a rear end detachably connected to the front end of the sleeve. A pusher rod is inserted inside the pusher housing. A pusher positioning part is provided at the rear end of the pusher rod. A blade is provided at the front end of the pusher rod. The pusher rod can engage with the pusher positioning part, thereby driving the blade to move back and forth. A cutting assembly is connected to the front end of the pusher housing, and the cutting assembly is connected to a staple cartridge, with the blade movable into the staple cartridge; A limiting component is disposed inside the pusher housing. When the pusher rod moves to the front end of its stroke, the limiting component can pull the pull rod forward to disconnect the switch, thereby stopping the drive motor. When the pusher rod moves to the front end of its stroke, the limiting component can also fix the pusher rod, so that the pusher rod stops moving forward.
2. The electric stapler with automatic matching of staple cartridge length according to claim 1, characterized in that: The limiting component includes a limiting rod that passes through the pusher housing. The rear end of the limiting rod is engaged with the pull rod. When the pusher rod moves to the front end of its stroke, the pusher positioning part drives the limiting rod forward, causing the limiting rod to pull the pull rod forward.
3. The electric stapler with automatic matching of staple cartridge length according to claim 2, characterized in that: The front end of the limiting rod is provided with a limiting protrusion, which avoids the pusher rod in the front-back direction. At least part of the projection of the limiting protrusion in the front-back direction coincides with the pusher positioning part.
4. The electric stapler with automatic matching of staple cartridge length according to claim 2, characterized in that: The rear end of the limiting rod is provided with a hook, and the side of the pull rod is provided with a locking interface. The hook can move with the pusher housing to a position aligned with the locking interface, and the rotation of the pusher housing can cause the hook to be inserted into the locking interface.
5. The electric stapler with automatic matching of staple cartridge length according to claim 2, characterized in that: The limiting component includes an elastic sheet, one end of which is fixed to the pusher housing. The push rod has multiple slots spaced apart on its side. The limiting rod has a push plate portion. When the push plate portion moves forward, it can push the elastic sheet to deform and engage with the slots.
6. The electric stapler with automatic matching of staple cartridge length according to claim 5, characterized in that: The pusher housing is provided with a first guide portion and a second guide portion, and a receiving hole extending in the front-rear direction is formed between the first guide portion and the second guide portion. The receiving hole allows the pusher rod to pass through and is used to guide the pusher positioning portion.
7. The electric stapler with automatic matching of staple cartridge length according to claim 6, characterized in that: A movable groove is formed between the first guide portion and the second guide portion. The movable groove avoids the receiving hole in the front-back direction. The rear end of the elastic sheet is located in the movable groove, and the front end of the elastic sheet is fixed to the inner wall of the movable groove.
8. The electric stapler with automatic matching of staple cartridge length according to claim 7, characterized in that: The elastic sheet has a mounting post at its front end, the diameter of which is greater than the thickness of the elastic sheet. The first guide portion has a first mounting hole for the mounting post to be inserted, and the second guide portion has a second mounting hole for the mounting post to be inserted.
9. The electric stapler with automatic matching of staple cartridge length according to claim 8, characterized in that: The front end of the push plate is provided with a guide slope that is inclined toward the push rod, and the guide slope can push the rear end of the elastic plate to move toward the push rod.
10. The electric stapler with automatic matching of staple cartridge length according to claim 9, characterized in that: The cutting assembly includes an anvil and a staple cartridge mounting part. The staple cartridge is mounted on the staple cartridge mounting part, which is located at the front end of the pusher housing. The anvil is hinged to the staple cartridge mounting part. The anvil and the staple cartridge cooperate to clamp the tissue. The blade can move forward to extend into the staple cartridge to cut the tissue.