Multifunctional anastomat and control method

Abstract

The invention relates to the technical field of anastomats, in particular to a multifunctional anastomat and a control method. A multifunctional anastomat comprises a motor, a rack and a percussion wheel, and is matched with at least three change-over switches and a current-limiting protection unit in a control circuit to realize multi-stage percussion and fault protection: a third change-over switch triggers current-limiting starting, a second change-over switch disconnects the current-limiting and keeps full-force percussion, and a first change-over switch cuts off the current to complete rapid shutdown; and the manual back-off anti-reuse structure is used for manually back-off the rack and disconnecting the engagement between the rack and the percussion wheel in case of clamping stagnation or fault, so that the unrepaired equipment is prevented from being restarted. Current-limiting protection, multi-step switching and safe reuse prevention are considered, and the operation safety and the operation efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of staplers, and in particular to a multifunctional stapler and a control method thereof. Background Art

[0002] With the popularization of minimally invasive surgical techniques, electric staplers are widely used in surgery. Such devices are usually composed of a motor, a rack and a stapler assembly. The motor drives the rack to move back and forth to complete tissue stapling and cutting. In order to adapt to complex surgical environments, staplers require multi-step precise control and fault protection mechanisms, including but not limited to: 1. Current limiting protection: prevent the motor from overheating or being damaged when overloaded or encountering large resistance. 2. Multi-switch linkage control: control the motor in stages at different travel points, such as current limiting start, full-strike and rapid shutdown. 3. Manual retraction and anti-reuse function: in the event of motor or rack failure or emergency need, manually retract the rack and disconnect it from the firing wheel to prevent the unrepaired device from being started again.

[0003] For example, Chinese patent CN111202553B discloses a manual retraction device for an electric stapler, which can realize manual retraction when the motor fails or the rack is blocked. However, in terms of the combination of "current limiting protection, staged firing control and manual retraction anti-reuse", this solution is still insufficient: 1. Lack of current limiting control with segmented switching: It only simply monitors the motor current and cannot automatically switch the current limiting unit at different stages, making it difficult to take into account both startup protection and full-strength firing.

[0004] 2. The linkage between quick stop and rack disconnection is not good enough: although it has manual retraction, it is still not perfect how to immediately cut off the motor and disconnect the rack meshing synchronously in case of fault.

[0005] 3. Imperfect anti-reuse measures: After a jam or failure, the rolled-back device may still restart unexpectedly, posing a safety hazard.

[0006] Therefore, how to integrate multifunctional mechanisms such as "current limiting protection, multi-switch control, manual fallback and anti-reuse" in the same device has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0007] The purpose of the present invention is to provide a multifunctional stapler and control method to address the deficiencies in the prior art, aiming to ensure efficient firing and ease of use while greatly improving the safety performance of the stapler, which can not only achieve current-limited startup and full-strength firing under normal circumstances, but also avoid secondary injuries through manual retraction and anti-reuse mechanisms in the event of a fault.

[0008] The present invention achieves the above-mentioned object through the following technical solutions: a multifunctional stapler, comprising a firing generator, a firing rack, and a firing wheel respectively connected to the firing generator and the firing rack; and further comprising: A control circuit includes a current limiting protection unit and at least three switching switches, wherein the at least three switching switches are respectively a first switching switch, a second switching switch and a third switching switch, and each of the switches has a common terminal, a normally closed terminal and a normally open terminal; a third switch switching structure is used to trigger the third switching switch to switch to conduction between the common terminal and the normally open terminal, so that the strike generator is started when the current limiting protection unit is turned on; a second switch switching structure is used to trigger the second switching switch to switch to conduction between the common terminal and the normally open terminal, so that the current limiting protection unit is disconnected after the strike generator is started, and the strike generator is maintained to work; The first switch switching structure is used to trigger the first switching switch to switch to the conduction between the common end and the normally open end to cut off the current flowing through the firing generator; the manual retraction anti-reuse structure is used to manually retract the firing rack and disconnect the engagement between the firing wheel and the firing rack.

[0009] Furthermore, the common end of the third switching switch is connected to one end of the shock generator, the normally open end is connected to one end of the current limiting protection unit, and the normally closed end is connected to a power supply electrode; the common end of the second switching switch is connected to another power supply electrode, the normally open end is connected to the first switching end of the third switching switch, and the normally closed end is connected to the other end of the current limiting protection unit; the common end of the first switching switch is connected to the other end of the shock generator, the normally open end is connected to another power supply electrode, and the normally closed end is connected to a power supply electrode.

[0010] Furthermore, the firing rack is provided with a first slide groove having a front inner wall and a rear inner wall; the first switch switching structure includes: a first switching switch, provided with a first switching contact; and a first switching trigger member, which is used to be movably connected to the stapler, and is provided with a first trigger part adjacent to the switching contact, and a first toggle part inserted into the first slide groove; one side of the first toggle part is pressed against by the front inner wall, so that the first switching trigger member is deflected in the direction in which the trigger part is close to the switching contact; the other side of the first toggle part is pressed against by the rear inner wall, so that the first switching trigger member is deflected in the direction in which the trigger part is away from the switching contact.

[0011] Furthermore, an oblique opening is provided at one end of the firing rack; the second switch switching structure includes: a second switching trigger member, which is placed obliquely at the oblique opening and has a second trigger portion on one side; and a second switching switch, which is adjacent to the second trigger portion and has a second switching contact point which is adjacent to the second trigger portion and is contacted by the second trigger portion.

[0012] Further, the third switch switching structure includes: a third switching trigger member provided with a third trigger portion and a torsion spring for resetting the third switching trigger member; a third switching switch provided with a third switching contact touched by the third trigger portion; a firing handle for driving the staple cartridge assembly to perform stapling and cutting actions and driving the third switching trigger member to rotate so that the third trigger portion touches the third switching contact; and an anastomosis handle for driving the staple cartridge assembly to perform anastomosis actions and for driving the firing handle to be adjacent to the third switching trigger member.

[0013] Further, the manual retraction anti-reuse structure includes: a driven retraction wheel meshing with the firing rack, coaxially connected to the firing wheel, and adjacent to the firing wheel, with a first misaligned engagement portion provided on one end face close to the firing wheel; a driving retraction wheel drivingly connected to the driven retraction wheel; and a wrench for rotating the driving retraction wheel and pressing down the driven retraction wheel; wherein, a second misaligned engagement portion engaged by the first misaligned engagement portion is provided on one end face of the firing wheel close to the driven retraction wheel, so that the teeth of the firing wheel and the teeth of the driven retraction wheel are misaligned.

[0014] A multifunctional stapler control method includes the following steps: Initialization step: configuring the first trigger portion of the first switching trigger member to be separated from the first switching contact; placing the second switching trigger member at the bevel of the firing rack, with the second trigger portion separated from the second switching contact; separating the third trigger portion of the third switching trigger member from the third switching contact; respectively making the common terminals of the first switching switch, the second switching switch and the third switching switch conduct with the normally closed terminals; Anastomosis step: pinching the anastomosis handle to drive the staple cartridge assembly to perform anastomosis actions; Firing current limiting step: pinching the firing handle to rotate the third switching trigger member so that the third trigger portion touches the third switching contact, thereby triggering the third switching switch to switch to the conduction between the common terminal and the normally open terminal, the firing motor rotates forward and drives the firing rack to push forward; Full-power firing step: the second switching trigger member disengages from the bevel and contacts the guiding surface, the second switching trigger member undergoes elastic torsion, so that the second trigger portion contacts the second switching contact, triggering the second switching switch to switch to the conduction between the common terminal and the normally open terminal, the firing motor continues to drive the firing rack to push forward with full power, and the firing rod is pushed forward by the firing rack to drive the staple cartridge assembly to perform stapling and cutting actions.

[0015] In this solution, by deeply integrating the current limiting protection unit, at least three switching switches and the manual retraction anti-reuse structure in the same stapler, the following beneficial effects are achieved: 1. Dual control of starting current limiting and full-power firing is realized. After the third switch switching structure is triggered, the motor starts smoothly under the conduction of the current limiting protection unit, avoiding overload impact. The second switch switching structure then disconnects the current limiting protection unit after the motor starts, enabling the motor to enter the full-power firing state, taking into account both starting protection and efficiency.

[0016] 2. Quick shutdown is linked with a multi-switch. When the firing is completed or an abnormality occurs, the first switching structure can switch the first switching switch to conduct between the common terminal and the normally open terminal, quickly cut off the current flowing through the firing generator, and immediately stop the motor. Through segmented switching control, the device can automatically enter the correct circuit state at each stage, reducing manual intervention and enhancing safety.

[0017] 3. Manual retraction and anti-reuse mechanism. When the motor or the rack malfunctions, jams, or needs to be emergently stopped, the operator can use the manual retraction anti-reuse structure to disconnect the engagement between the firing wheel and the firing rack. In this way, the device cannot be simply restarted after a failure and must undergo professional maintenance or key component replacement, effectively preventing the mis-reuse of faulty devices and improving medical safety assurance.

[0018] 4. Multi-functional integration and simplified operation. Functions such as current-limiting protection, multi-step switch control, and manual retraction anti-reuse are uniformly designed in the same device, reducing external circuits or cumbersome components, and facilitating medical staff to quickly master and use during surgery. Compared with traditional solutions that require multiple independent modules or additional mechanical designs, the present invention can complete multi-link automatic or semi-automatic control with a more compact structure, enhancing the reliability and adaptability of the stapler.

[0019] Through the above technical means, while ensuring efficient firing and ease of use, the present invention significantly improves the safety performance of the stapler. It can not only achieve current-limiting start-up and full-power firing under normal circumstances but also avoid secondary injuries through manual retraction and anti-reuse mechanisms in case of a failure, having significant clinical application value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a circuit schematic diagram of the initial state of the motor control circuit.

[0021] Figure 2 It is a circuit schematic diagram of the firing current-limiting state of the motor control circuit.

[0022] Figure 3 It is a circuit schematic diagram of the full-power firing state of the motor control circuit.

[0023] Figure 4 It is a circuit schematic diagram of the state when the firing reaches the end of the motor control circuit.

[0024] Figure 5 It is a circuit schematic diagram of the initial state of the retraction of the motor control circuit.

[0025] Figure 6 It is a circuit schematic diagram of the latter stage state of the retraction of the motor control circuit.

[0026] Figure 7 Schematic diagram of the circuit in the fallback state of the motor control circuit.

[0027] Figure 8 Schematic diagram of the circuit in the reset state of the motor control circuit.

[0028] Figure 9 Schematic diagram of the circuit in the active fallback state during the firing process of the motor control circuit.

[0029] Figure 10 Schematic diagram of the circuit for manual fallback when opening the safety cover plate of the motor control circuit.

[0030] Figure 11 Exploded view of the structure of the stapler switching switch and enlarged view of the partial structure.

[0031] Figure 12 Schematic diagrams of the structure of the stapler switching switch in two switching states.

[0032] Figure 13 Schematic diagrams of the structure of the stapler toggle switch in two switching states.

[0033] Figure 14 Exploded view of the structure of the stapler toggle switch and enlarged view of the partial structure.

[0034] Figure 15 Schematic diagram of the structure among the anastomosis handle, firing handle and third switching switch when the stapler is in the anastomosis and firing states.

[0035] Figure 16 Exploded view of the structure of the first switching trigger and mounting bracket and enlarged view of the partial structure.

[0036] Figure 17 Partial structure schematic diagrams of the first switching trigger in two states.

[0037] Figure 18 Schematic diagrams of the structure of the current-limiting on-off switch in the exploded and non-exploded states.

[0038] Figure 19 Schematic diagram of the exploded structure of a part of the present invention.

[0039] Figure 20 Schematic diagrams of the structure of the stapler active fallback structure in two states.

[0040] Figure 21 Schematic diagrams and enlarged views of the partial structure of the firing wheel and driven fallback wheel of the present invention from two different perspectives.

[0041] Figure 22Schematic diagram of another part of the structure of the present invention.

[0042] Figure 23 Schematic diagram of the overall structure of the present invention and enlarged view of the partial structure.

[0043] Figure 24 Schematic diagram of the connection structure between the active retraction wheel and the circuit board of the present invention.

[0044] Figure 25 Schematic diagram of the manual retraction process of the stapler of the present invention.

[0045] Figure 26 Schematic diagram of the toggle switch switching structure of the stapler of the present invention.

[0046] Figure 27 is Figure 26 Schematic diagram of the structure of Figure A in from another perspective.

[0047] Figure 28 Schematic diagram of the structure of the stapler toggle switch switching structure of the present invention after being installed in the mounting bracket. Detailed implementation manners

[0048] Next, the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0049] As Figures 1 to 10 shown, a motor control circuit includes a percussion generator 6, a current limiting protection unit, and a plurality of switching switches. The switching switches include a first switching switch SW1, a second switching switch SW2, a third switching switch SW3, and a fourth switching switch SW0, and each of the switching switches has a common terminal, a first switching terminal, and a second switching terminal. Among them, the first switching terminal is a normally open terminal, and the second switching terminal is a normally closed terminal; The current limiting protection unit includes a current limiting element, a thermosensitive element, and a current limiting on-off switch 4 connected in series. The current limiting element is a current limiting resistor R, the thermosensitive element is a thermistor PTC, and the current limiting on-off switch 4 has a first end S4-1 and a second end S4-2. It can be turned on and off between the first end S4-1 and the second end S4-2. The second end S4-2 is electrically connected to one end of the current limiting resistor R, and one end of the thermistor PTC is electrically connected to the other end of the current limiting resistor R; The third switching switch SW3, its common terminal is connected to the negative electrode of the percussion generator 6, the normally open terminal is connected to the other end of the thermistor PTC, and the normally closed terminal is connected to the negative power supply terminal; The second switching switch SW2, the common terminal is connected to the normally closed terminal of the fourth switching switch SW0, the normally open terminal is connected to the normally open terminal of the third switching switch SW3, and the normally closed terminal is connected to the first end S4-1; The first switching switch SW1, the common terminal is connected to the positive electrode of the striking generator 6, the normally open terminal is connected to the normally closed terminal of the fourth switching switch SW0, and the normally closed terminal is connected to the negative electrode of the power supply; The fourth switching switch SW0, the common terminal is connected to the positive electrode of the power supply, and the normally open terminal is left vacant.

[0050] Furthermore, an indicator light module is also connected in parallel to the motor control circuit. Specifically, one end of the indicator light module is electrically connected to the normally closed terminal of the fourth switching switch SW0, and the other end of the indicator light module is connected to the normally closed terminal of the first switching switch SW1 and / or the negative electrode of the power supply.

[0051] It should be noted that the motor control circuit can be used in the field of staplers and other fields with motors.

[0052] A stapler switching switch structure, as Figure 11 、 Figure 12 shown, includes: a firing rack 5, a second switching trigger 22, and a second switching switch SW2. Among them: for the firing rack 5, one end is provided with a first avoidance position 52; for the second switching trigger 22, it is obliquely placed in the first avoidance position 52, and a second trigger portion 221 is provided on one side; The second switching switch SW2 is adjacent to the second trigger portion 221, and is provided with a second switching contact 21 that is adjacent to the second trigger portion 221 and is contacted by the second trigger portion 221.

[0053] Furthermore, an insertion interface 201 is provided on one side of the second switching switch SW2, and the second switching trigger 22 is provided with a plug 222 that is tightly fitted into the insertion interface 201. The second switching trigger 22 is an elastic member and has a certain elastic deformation performance. When the second switching trigger 22 disengages from the first avoidance position 52, it generates elastic deformation, so that when the bottom of the second switching trigger 22 approaches the first avoidance position 52, it is reset and obliquely placed in the first avoidance position 52, thereby separating the second trigger portion 221 and the second switching contact 21 of the second switching switch SW2.

[0054] Further, the contact between the second trigger portion 221 of the second switching trigger member 22 and the second switching contact 21 of the second switching switch SW2 is achieved by the elastic deformation of the bottom of the second switching trigger member 22, ensuring that the second switching switch SW2 is continuously pressed; on one side of the firing rack 5, there is a guiding surface 54 that is contacted by the bottom of the second switching trigger member 22 and extends towards the first avoidance position 52. When the second switching trigger member 22 is placed in the first avoidance position 52, the second trigger portion 221 is separated from the second switching contact 21 of the second switching switch SW2; when the bottom of the second switching trigger member 22 disengages from the first avoidance position 52 and contacts the guiding surface 54, the second trigger portion 221 contacts the second switching contact 21 of the second switching switch SW2. Specifically, the pointed portion of the included angle formed between the guiding surface 54 and the guiding inclined surface 53 of the first avoidance position 52 abuts against the bottom of the second switching trigger member 22. Since one side of the mounting wall of the second switching trigger member 22 is tightly fixed to the second switching switch SW2 through a pin 222, the bottom of the second switching trigger member 22 will undergo a certain elastic torsion under the abutment of the pointed portion of the included angle, causing the second trigger portion 221 of the second switching trigger member 22 to abut against the second switching contact 21 of the second switching switch SW2, realizing the switching of the second switching switch SW2, that is, the second switching switch SW2 is switched from the conduction between the common terminal and the normally closed terminal to the conduction between the common terminal and the normally open terminal.

[0055] A stapler switch switching structure, such as Figures 26 to 28 , includes: a mounting bracket 8, a firing rack 5, a second trigger switching member 23, and a second switching switch SW2. Among them: the mounting bracket 8 is formed with a guiding chute opening 87; the firing rack 5 is provided with a second avoidance position 55; the second trigger switching member 23 includes a guiding connection portion 231 inserted into the guiding chute opening 87, and a second contact portion 232 integrally formed with the guiding connection portion 231 and accommodated by the second avoidance position 55; the second switching switch SW2 is adjacent to the second contact portion 232 and is provided with a second switching contact 21 adjacent to the second contact portion 232 and contacted by the second contact portion 232. The firing rack 5 is provided with a guiding surface 54, the second avoidance position 55 is arranged at one end of the guiding surface 54, and a guiding inclined surface 53 is arranged between the second avoidance position 55 and the guiding surface 54. See Figure 26 Figure A in Figure 26 . Before firing, the second contact portion 232 is separated from the second switching contact 21; during firing, the firing rack 5 advances, causing the second contact portion 232 of the second trigger switching member 23 to be lifted, the guiding connection portion 231 rises along the guiding chute opening 87, and the second contact portion 232 disengages from the second avoidance position 55 until the second contact portion 232 contacts the second switching contact 21. See

[0056] A stapler toggle switch switching structure, such asFigure 13 , Figure 14 As shown, it includes: a firing rack 5, a first switching switch SW1 and a first switching trigger 12. Among them: the firing rack 5 is provided with a first sliding groove 51 having a front inner wall 511 and a rear inner wall 512; the first switching switch SW1 is provided with a first switching contact 11; the first switching trigger 12 is used to be movably connected to the stapler, and is provided with a first triggering part 121 adjacent to the first switching contact 11, and a first toggle part 122 inserted into the first sliding groove 51; One side of the first toggle portion 122 is pressed against by the front inner wall 511, so that the first switching trigger 12 is deflected in the direction of the first trigger portion 121 approaching the first switching contact 11; the other side of the first toggle portion 122 is pressed against by the rear inner wall 512, so that the first switching trigger 12 is deflected in the direction of the first trigger portion 121 away from the first switching contact 11. The contact between the first trigger portion 121 and the first switching contact 11 is achieved by the front inner wall 511 pressing against the first toggle portion 122, so that the first switching trigger 12 is deflected. The disconnection between the first trigger portion 121 and the first switching contact 11 is achieved by the rear inner wall 512 pressing against the first toggle portion 122, so that the first switching trigger 12 is deflected in the opposite direction. Specifically, the first switching trigger member 12 is abutted against the first toggle portion 122 by the front inner wall 511 and deflected in the first direction, so that the first trigger portion 121 of the first switching trigger member 12 contacts the first switching contact 11 of the first switching switch SW1, thereby triggering the first switching switch SW1 to switch from the conduction between the common terminal and the normally closed terminal to the conduction between the common terminal and the normally open terminal. The first switching trigger member 12 is abutted against the first toggle portion 122 by the rear inner wall 512 and deflected in the opposite direction to the first direction, so that the first trigger portion 121 of the first switching trigger member 12 is away from and disconnected from the first switching contact 11 of the first switching switch SW1.

[0057] Furthermore, the first switching trigger member 12 is also provided with a hinged portion 123 for movably mounting the first switching trigger member 12 on the stapler. Specifically, the first switching trigger member 12 deflects based on the hinged portion 123 as a rotating shaft. The hinged portion 123 is a hinged hole, which is hinged by the mounting shaft 86 of the mounting frame 8.

[0058] Furthermore, if Figure 18 , Figure 19 , Figure 22As shown, it further includes a current-limiting on-off switch 4, a current-limiting on-off trigger 42, and a current-limiting reset knob 43. Among them: The current-limiting on-off switch 4 is provided with a current-limiting on-off contact 41; the current-limiting on-off trigger 42 is provided with a current-limiting trigger part 421 adjacent to the current-limiting on-off contact 41, and a first chute 51 extending into the firing rack 5, and is rotated by being abutted by the front inner wall 511, so that the current-limiting trigger part 421 contacts the current-limiting receiving part 422 of the current-limiting on-off contact 41; one end of the current-limiting reset knob 43 is connected to the current-limiting on-off trigger 42, and is used to receive manual force to rotate the current-limiting on-off trigger 42 to reset, so that the current-limiting trigger part 421 is separated from the current-limiting on-off contact 41, and the current-limiting receiving part 422 is re-dialed into the first chute 51. Specifically, the first end S4-1 of the current-limiting on-off switch 4 is arranged on the current-limiting on-off contact 41, and the second end S4-2 is arranged on the current-limiting trigger part 421; or, the first end S4-1 is arranged on the current-limiting trigger part 421, and the second end S4-2 is arranged on the current-limiting on-off contact 41. In detail, in combination with Figures 1 to 10 , in the state to be fired, the current-limiting on-off switch 4 is in a conducting state; after firing, the front inner wall 511 of the firing rack 5 will abut against the current-limiting receiving part 422, so that the current-limiting on-off trigger 42 deflects, to disconnect the connection between the current-limiting trigger part 421 and the current-limiting on-off contact 41, and further disconnect the current-limiting on-off switch 4, so that the current-limiting protection unit is open. After the firing is completed and the device is retracted to the end, the current-limiting on-off switch 4 remains in the open state and cannot be automatically reset. Therefore, the stapler cannot be fired again. It is necessary to manually rotate the current-limiting reset knob 43 to synchronously rotate the current-limiting on-off trigger 42 to fully reset. In this way, the current-limiting on-off switch 4 can effectively prevent misfiring. At the same time, it can effectively remind the operating doctor that the stapler has been fired at this time, and a new cartridge assembly 82 must be replaced, and then the current-limiting on-off switch 4 must be manually reset to be able to perform anastomosis and firing again, effectively avoiding the situation of anastomosis cutting of an empty cartridge with the already used cartridge assembly 82, and the safety factor is higher.

[0059] Furthermore, as shown in Figure 14 Figure B, the first switching trigger 12 is provided with a limiting bump 124. As shown in Figure 16 , the mounting bracket 8 is provided with a limiting groove 85 into which the limiting bump 124 is snapped; the mounting bracket 8 is also provided with a mounting shaft 86 hinged by the hinge part 123 of the first switching trigger 12. In detail, as shown in Figure 14 , Figure 16 and Figure 17 , there are 2 limiting bumps 124, namely bump 124a and bump 124b; there are 3 limiting grooves 85, namely groove 85a, groove 85b and groove 85c. Before the stapler is fired, the first trigger part 121 of the first switching trigger 12 is separated from the first switching contact 11 of the first switching switch SW1. At this time, as shown in Figure 16 andFigure 17 In Figure A, the bumps 124a and 124b are respectively snapped into the grooves 85a and 85b, so that during the firing process of the firing rack 5, the stability of the first switching trigger 12 is maintained, and the first trigger portion 121 and the first switching contact 11 are always separated, avoiding the displacement of the first switching trigger 12 and resulting in poor contact, that is Figures 1 to 3 in, the first switching switch SW1 always maintains the state of conducting between 1 and 3 and disconnecting between 1 and 2. Until the firing rack 5 fires to the end, the front inner wall 511 of the first chute 51 deflects the first switching trigger 12. At this time, see Figure 17 In Figure B, the bumps 124a and 124b are respectively snapped into the grooves 85b and 85c, so that during the subsequent retraction process of the firing rack 5, the first trigger portion 121 and the first switching contact 11 are always in contact, that is Figures 4 to 6 in, the first switching switch SW1 always maintains the state of conducting between 1 and 2 and disconnecting between 1 and 3. Until the firing rack 5 retracts to the end, the rear inner wall 512 of the first chute 51 deflects and resets the first switching trigger 12.

[0060] A stapler active stop structure includes the stapler toggle switch switching structure described in any one of the foregoing, and further includes an active stop button 67 provided with a second chute 671 for manually pushing the first switching trigger 12 to deflect; the first switching trigger 12 is further provided with a second toggle portion 125 inserted into the second chute 671. A relief notch 125a is formed on one side of the second toggle portion 125 close to the active stop button 67. Specifically, the active stop button 67 advances and retreats, and toggles the second toggle portion 125 of the first switching trigger 12 to rotate the first switching trigger 12 to turn on and off the first switching switch SW1.

[0061] A stapler active retraction structure, as Figures 19 to 23 shown, includes a firing generator 6, a firing rack 5, and a firing wheel 62 respectively meshed with the firing generator 6 and the firing rack 5; it further includes: a driven retraction wheel 63 and a driving retraction wheel 64. The driven retraction wheel 63 is meshed with the firing rack 5. The driving retraction wheel 64 is meshed with the driven retraction wheel 63, and the driving retraction wheel 64 is provided with a first limit application portion 641 for externally applying force to rotate the driving retraction wheel 64.

[0062] Furthermore, the active retraction structure of the stapler further includes a guide shaft 65. The driven retraction wheel 63 and the firing wheel 62 are coaxially connected to the guide shaft 65. The driven retraction wheel 63 and the firing wheel 62 are respectively movably connected to the guide shaft 65 and can slide along the length direction of the guide shaft 65. It also includes an elastic member 66 sleeved on the guide shaft 65, and the elastic force of the elastic member 66 acts on one end of the firing wheel 62 away from the driven retraction wheel 63. It further includes a wrench 7 for rotating the active retraction wheel 64. The wrench 7 is provided with a second limiting force application portion 71 that matches the first limiting force application portion 641, so that the active retraction wheel 64 can be force-applied through the wrench 7. The first limiting force application portion 641 is a force application shaft, and the second limiting force application portion 71 is a limiting connection port. The force application shaft is provided with an external thread, and the limiting connection port is provided with an internal thread that matches the external thread. The wrench 7 is provided with a pressing portion 72, and the top of the driven retraction wheel 63 is provided with a pressed portion 632 pressed by the pressing portion 72. The wrench 7 is also used to press against the pressed portion 632 through the pressing portion 72 to press down the driven retraction wheel 63 and the firing wheel 62. A detachable safety cover plate 81 is provided on the main body of the stapler. The safety cover plate 81 is located at the top of the first limiting force application portion 641. Opening the safety cover plate 81 can expose the first limiting force application portion 641 of the active retraction wheel 64, so that the wrench 7 can be connected and manually apply force to and rotate the active retraction wheel 64.

[0063] In addition, as Figure 24 shown, the stapler of this solution further includes a circuit board 88. A coupling port 881 is opened on the circuit board 88. The first limiting force application portion 641 of the active retraction wheel 64 is inserted into the coupling port 881 of the circuit board 88, so that the active retraction wheel 64 can be installed on the circuit board 88 and can rotate relative to the circuit board 88. During the actual manual retraction process, the wrench 7 is threadedly connected to the first limiting force application portion 641 until the active retraction wheel 64 and the circuit board 88 are slightly tightened, and then the active retraction wheel 64 can be rotated through the wrench 7. In addition, the active retraction wheel 64 can also be movably passed through the circuit board 88 by setting bearings. The active retraction steps are shown in Figure 25 , open the safety cover plate 81 as shown in Figure A, screw in the wrench 7 to disengage the firing mechanism 6 from the firing rack 5 as shown in Figure B, and press the reset button after screwing the wrench 7 clockwise to the end to open the jaws as shown in Figure C.

[0064] A unidirectional transmission stapler, as Figures 19 to 23As shown in the figure, it includes a percussion generator 6, a percussion rack 5, and a percussion wheel 62; it also includes: a driven retraction wheel 63, a driving retraction wheel 64, a wrench 7, a guide shaft 65, and an elastic member 66. Among them: The percussion wheel 62 is respectively meshed and connected with the percussion generator 6 and the percussion rack 5; the driven retraction wheel 63 is coaxially connected with the percussion wheel 62 and is adjacent to the percussion wheel 62, and a first misalignment joint 631 is arranged at one end face close to the percussion wheel 62; the driving retraction wheel 64 is meshed and connected to the driven retraction wheel 63; the wrench 7 is used to rotate the driving retraction wheel 64 and press down the driven retraction wheel 63; the guide shaft 65 is coaxially inserted through the percussion wheel 62 and the driven retraction wheel 63 respectively, so that the percussion wheel 62 and the driven retraction wheel 63 can slide on the guide shaft 65; the elastic member 66 is sleeved on the guide shaft 65 and acts on the percussion wheel 62 to keep the percussion wheel 62 in a predetermined position on the guide shaft 65 where it can be meshed with the percussion rack 5, and provides a reset elastic force for the percussion wheel 62 when the percussion wheel 62 is pressed down; among them, a second misalignment joint 621 that is engaged by the first misalignment joint 631 is arranged at one end face of the percussion wheel 62 close to the driven retraction wheel 63, so that the teeth of the percussion wheel 62 and the teeth of the driven retraction wheel 63 are misaligned.

[0065] Further, as shown in Figure 21 Figures A and B, the first misalignment joint 631 is a misalignment protrusion 631a, and the second misalignment joint 621 is a misalignment groove 621a. When the misalignment protrusion 631a is snapped into the misalignment groove 621a, the teeth of the percussion wheel 62 and the teeth of the driven retraction wheel 63 are misaligned with each other. One end of the misalignment protrusion 631a is provided with a first one-way limiting surface 631a1, and the other end is provided with a first one-way guiding inclined surface 631a2. One end of the misalignment groove 621a is provided with a second one-way limiting surface 621a1 abutted by the first one-way limiting surface 631a1, and the other end is provided with a second one-way guiding inclined surface 621a2 abutted by the first one-way guiding inclined surface 631a2. Further, when the misalignment protrusion 631a is snapped into the misalignment groove 621a and the driven retraction wheel 63 rotates in the direction (clockwise) in which the percussion rack 5 advances, the driven retraction wheel 63 rotates synchronously with the percussion wheel 62; and when the misalignment protrusion 631a is snapped into the misalignment groove 621a and the driven retraction wheel 63 rotates in the direction (counterclockwise) in which the percussion rack 5 retracts, the driven retraction wheel 63 and the percussion wheel 62 can rotate relatively, such as the percussion wheel 62 remains stationary while the driven retraction wheel 63 rotates, realizing one-way transmission.

[0066] Further, a first limiting and applying force portion 641 is arranged at the top of the driving retraction wheel 64; the wrench 7 is provided with a second limiting and applying force portion 71 that matches the first limiting and applying force portion 641, so that the driving retraction wheel 64 can be applied with force through the wrench 7; a safety cover plate 81 is arranged at the top of the driving retraction wheel 64. Specifically, the second limiting and applying force portion 71 is a limiting connection port with internal threads, and the first limiting and applying force portion 641 is a force-applying shaft inserted into the limiting connection port, and the force-applying shaft is provided with external threads matching the internal threads.

[0067] Manual retraction process: Open the safety cover plate 81 to expose the force application shaft at the top of the active retraction wheel 64. Align the limit connection port of the wrench 7 with the force application shaft and tighten it until the wrench 7 is pressed down and pre-tightened against the active retraction wheel 64. During the pressing process, the pressing part 72 of the wrench 7 abuts against the pressed part 632 at the top of the driven retraction wheel 63 to press down the driven retraction wheel 63 and the firing wheel 62 by a certain stroke until the firing wheel 62 disengages from the firing rack 5, and the elastic member 66 is compressed to generate a reset elastic force. After the firing wheel 62 disengages from the firing rack 5, when the wrench 7 is continuously rotated, the driven retraction wheel 63 rotates, and the misalignment convex 631a can be inserted into the misalignment groove 621a. At this time, the teeth between the firing wheel 62 and the driven retraction wheel 63 are misaligned with each other (i.e., the gears of the two are misaligned). Since the driven retraction wheel 63 still meshes with the firing rack 5, the teeth between the firing wheel 62 and the firing rack 5 are also misaligned, and under the action of the elastic member 66, the firing wheel 62 is stuck at the bottom of the firing rack 5. At this time, due to the structural design of the first one-way guide slope 631a2 and the second one-way guide slope 621a2, if the wrench 7 is rotated to make the driven retraction wheel 63 rotate counterclockwise, the driven retraction wheel 63 can still continue to rotate counterclockwise, so that the firing rack 5 drives the firing rod to continue to retract, ensuring the function of manual retraction.

[0068] On the other hand, when the misalignment convex 631a is inserted into the misalignment groove 621a, if the wrench 7 is rotated to make the driven retraction wheel 63 rotate clockwise, due to the structural design that the first one-way limit surface 631a1 abuts against the second one-way limit surface 621a1, the driven retraction wheel 63 and the firing wheel 62 will move synchronously. However, the firing wheel 62 is always meshed with the output wheel 61 on the output shaft of the firing generator 6, and at this time the firing generator 6 does not work. Therefore, affected by the braking of the firing generator 6, the driven retraction wheel 63 cannot rotate clockwise. Furthermore, it is ensured that the teeth between the driven retraction wheel 63 and the firing wheel 62 are always misaligned, and then the teeth between the firing rack 5 and the firing wheel 62 are always misaligned, avoiding the possibility that the teeth of the firing wheel 62 are realigned with the teeth of the firing rack 5, resulting in the firing wheel 62 slipping again and meshing with the firing rack 5 under the abutment of the elastic member 66. That is, when the downward pressure of the wrench 7 is withdrawn, the firing wheel 62 and the firing rack 5 cannot be reset and meshed again. It is prevented that the teeth between the firing wheel 62 and the firing rack 5 are remeshed and reset, avoiding the reuse of the malfunctioning stapler. After the malfunctioning stapler manually retracts the firing rack 5, it can also achieve the anti-reuse function and effect at the same time, effectively avoiding the safety hazards caused by the reuse of the malfunctioning stapler.

[0069] Since the firing wheel 62 cannot be re-engaged with the firing rack 5, even if the firing generator 6 drives the firing wheel 62 to rotate, it cannot smoothly drive the firing rack 5 to move forward and backward. Furthermore, the possibility of a jammed stapler being reused after being manually retracted is avoided.

[0070] Specifically, as Figure 21 shown, the first misaligned engaging portion 631 is a right trapezoidal convex block structure, and the second misaligned engaging portion 621 is a trapezoidal convex groove structure that matches the right trapezoidal convex block and is engaged by the right trapezoidal convex block.

[0071] In detail, as Figure 21 shown, the second misaligned engaging portion 621 is a trapezoidal convex block, and the first misaligned engaging portion 631 is a trapezoidal convex groove that matches the trapezoidal convex block and is engaged by the trapezoidal convex block.

[0072] Stapling / clamping process: Engage the stapling handle 83 to close the staple cartridge assembly 82 to clamp the tissue to be cut and stapled.

[0073] Firing process: Squeeze the firing handle 84. One end of the firing handle 84 abuts against one end of the third switching trigger 32 to make the third switching trigger 32 rotate until the third switching trigger 32 contacts the third switching switch SW3, causing the third switching switch SW3 to switch from the conduction between the common terminal and the normally closed terminal to the conduction between the common terminal and the normally open terminal. Furthermore, it triggers the firing generator 6 to rotate forward to drive the firing wheel 62 to rotate clockwise. The firing wheel 62 drives the firing rack 5 to move forward, and the firing rack 5 pushes the firing rod forward. The forward movement of the firing rod drives the closed staple cartridge assembly 82 to perform the cutting and stapling action, completing the cutting and stapling of the tissue.

[0074] Automatic retraction process: Release the firing handle 84 to reset the third switching trigger 32 and disconnect it from the third switching switch SW3, causing the third switching switch SW3 to switch back to the conduction between the common terminal and the normally closed terminal. Furthermore, it triggers the firing generator 6 to rotate in reverse to drive the firing wheel 62 to rotate counterclockwise, and then drives the firing rack 5 and the firing rod to retract.

[0075] In yet another embodiment, as Figure 19 and Figure 22 shown, the firing generator 6 is provided with a transmission output wheel 61 mounted on the output shaft of the firing generator 6, and the firing wheel 62 is engaged with the transmission output wheel 61.

[0076] A method for controlling the firing of a stapler includes the following steps: initialization step, stapling step, firing current limiting step, full-power firing step, current limiting switch cutting-off step, firing to the end step, retraction initial step, retraction rear section step, retraction to the end step. Among them: Initialization step: For the circuit part, refer to Figure 1, the first switch SW1, the second switch SW2 and the third switch SW3 are all configured to conduct between the common terminal and the normally closed terminal (i.e. SW1-SW3 are 1-3 conducting), and the fourth switch SW0 is also configured to conduct between the common terminal and the normally closed terminal (i.e. SW0 is 1-2 conducting); the current limiting disconnect switch 4 is configured to conduct between the first terminal S4-1 and the second terminal S4-2. Corresponding structural parts: see Figure 11 and Figure 12 In FIG. A, the second switching trigger 22 is placed in the first avoidance position 52 of the firing rack 5, and the second trigger portion 221 is separated from the second switching contact 21, corresponding to the conduction between the common terminal and the normally closed terminal of the second switching switch SW2. Figure 13 In FIG. B, the first trigger portion 121 of the first switching trigger member 12 is separated from the first switching contact 11, and the corresponding first switching switch SW1 is connected between the common terminal and the normally closed terminal. Figure 15 In FIG. A, the firing handle 84 is away from the third switching trigger member 32, and the third trigger portion 321 is separated from the third switching contact 31, corresponding to the conduction between the common terminal and the normally closed terminal of the third switching switch SW3. Figure 23 The safety cover 81 is covered on the main body of the stapler, corresponding to the conduction between the common terminal and the normally closed terminal of the fourth switch SW0. Figure 18 and Figure 19 The current limiting triggering part 421 of the current limiting disconnecting triggering member 42 contacts the current limiting disconnecting contact 41 of the current limiting disconnecting switch 4, corresponding to the current limiting disconnecting switch 4 being conductive between the first end S4-1 and the second end S4-2.

[0077] Anastomosis step: pinch the anastomosis handle 83, see Figure 15 From Figure A to Figure B, after pinching the anastomosis handle 83, the firing handle 84 will be close to the first switching trigger member 12. Figure 23 , pinching the anastomosis handle 83 will drive the staple cartridge assembly 82 to perform anastomosis (ie, the staple cartridge assembly 82 will close).

[0078] Firing current limiting steps: pinch the firing handle 84, see Figure 15 From Figure B to Figure C, the third switching trigger member 32 is pushed against by the firing handle 84 and rotates, so that the third trigger portion 321 contacts the third switching contact 31 to trigger Figure 2 The third switch SW3 is switched to the conduction between the common terminal and the normally open terminal (i.e., 1-2 is turned on), at which time the current limiting protection unit is energized, the firing generator 6 rotates forward, and drives the firing rack 5 to move forward; Full fire steps: see Figure 12 From Figure A to Figure B, the firing rack 5 is pushed forward, and the second switching trigger member 22 will be separated from the first avoiding position 52 until the bottom of the second switching trigger member 22 contacts the guide surface 54. At this time, the second switching trigger member 22 undergoes a certain elastic deformation and twists, so that the second trigger portion 221 contacts the second switching contact 21, realizingFigure 3 The second switching switch SW2 is triggered to switch between the common terminal and the normally open terminal (i.e., switching from 1-3 conduction to 1-2 conduction), the current limiting protection unit is disconnected, and the firing generator 6 continues to drive the firing rack 5 forward with full power, and the firing rack 5 drives the firing rod forward, so that the firing rod drives the nail magazine assembly 82 to perform nailing and cutting action; Current limit switch cut-off step: After the full-strike step, see Figure 18 and Figure 19 , the firing rack 5 continues to push forward until the front inner wall 511 of the firing rack 5 pushes open the current limiting dial portion 422 of the current limiting disconnection trigger 42, causing the current limiting disconnection trigger 42 to deflect, and at the same time, the current limiting disconnection trigger 42 and the current limiting reset dial button 43 are synchronously deflected, and the current limiting trigger portion 421 and the current limiting disconnection contact 41 are separated, thereby achieving Figure 5 The first end S4 - 1 and the second end S4 - 2 of the intermediate current limiting disconnect switch 4 are disconnected.

[0079] Firing to the end step: After the full-strength firing step or the current limiting switch cut-off step, the firing rack 5 continues to push forward, see Figure 13 In FIG. A, the front inner wall 511 of the first slide groove 51 of the firing rack 5 will toggle the first toggle portion 122 of the first switching trigger member 12, causing the first switching trigger member 12 to deflect until the first trigger portion 121 contacts the first switching contact 11, thereby triggering the triggering member 12 to rotate. Figure 4 The first switch SW1 is switched to conduction between the common terminal and the normally open terminal (i.e., switched from 1-3 conduction to 1-2 conduction), and an equipotential voltage is formed at both ends of the generator 6 to block the current flow, and the generator 6 stops rotating.

[0080] Initial step of retreat: release the firing handle 84, see Figure 15 From Figure C to Figure B, the third triggering portion 321 rebounds and resets and separates from the third switching contact 31 to trigger Figure 5 The third switch SW3 in the triggering mechanism is switched to conduction between the common terminal and the normally closed terminal (i.e., switched from 1-2 conduction to 1-3 conduction), the firing generator 6 is reversed, and the firing rack 5 is driven to retreat.

[0081] Backward step: firing rack 5 backs up, see Figure 12 From Figure B to Figure A, the second switching trigger member 22 gradually rebounds and falls back to the first avoidance position 52 until the second trigger portion 221 is separated from the second switching contact 21 to achieve the triggering. Figure 6 The second switch SW2 is switched to conduction between the common terminal and the normally closed terminal (i.e., switching from 1-2 conduction to 1-3 conduction). At this time, the second switching trigger 22 has not completely returned to the first avoidance position 52, and the firing rack 5 still has a certain retreat travel space.

[0082] Step of returning to the bottom: The firing rack 5 continues to return until theFigure 13 From A to B, and Figure 14 That is, when the firing rack 5 retreats to the bottom, the rear inner wall 512 of the first slide groove 51 will toggle the first toggle portion 122, causing the first switching trigger 12 to deflect until the first trigger portion 121 is separated from the first switching contact 11 and the contact is broken, thereby achieving Figure 7 The first switch SW1 is triggered to switch between the common terminal and the normally closed terminal (ie, switching from 1-2 conduction to 1-3 conduction).

[0083] Warning step: perform the matching step and / or the firing current limiting step again. If the firing generator 6 does not start and cannot drive the rack forward or backward, it means Figure 23 The nail magazine assembly 82 may have been used, or when the nail magazine assembly 82 is not installed, the device will be blocked during the current limiting period, and it is necessary to be aware of whether to replace the new nail magazine assembly 82 to avoid the safety hazard caused by firing an empty nail magazine. After the anastomosis step is performed, the generator 6 cannot be started directly, and a reset step is required.

[0084] Reset steps: Manually turn the current limit reset dial 43, see Figure 22 , Figure 23 ,as well as Figure 18 A and B of the figure, the current limiting disconnection trigger member 42 is deflected in the reset direction until the current limiting trigger part 421 contacts the current limiting disconnection contact 41 again, at this time ... Figure 8 The first end S4-1 and the second end S4-2 of the current limiting disconnect switch 4 are reconnected. After the reset step, the matching step and / or the firing current limiting step are performed again to start the firing generator 6 to rotate and drive the firing rack 5 to move forward and backward.

[0085] Furthermore, after the full-strength firing step, the step further includes: Active retraction step during the firing process: push the active stop button 67 to push the second toggle portion 125 of the first switching trigger member 12, so that the first switching trigger member 12 rotates until the first trigger portion 121 contacts the first switching contact 11, triggering the first switching switch SW1 to switch to the common end and the normally open end, forming an equipotential voltage at both ends of the firing generator 6 to block the current flow, and the firing generator 6 stops rotating; The firing step is as follows: after the current limiting switch cut-off step, if the firing process active retraction step is not executed, the firing rack 5 continues to be pushed forward until the first switching switch SW1 is triggered to switch to the common end and the normally open end, and an equipotential voltage is formed at both ends of the firing generator 6 to block the current flow, and the firing generator 6 stops rotating.

[0086] Further, after the full-power firing step, the following steps are further included: Manual retraction step: Open the safety cover plate 81, the fourth changeover switch SW0 is switched to the conduction between the common terminal and the normally open terminal, the firing generator 6 stops, the first limit force application portion 641 of the active retraction wheel 64 is exposed, the second limit force application portion 71 of the wrench 7 is connected to the first limit force application portion 641, and the wrench 7 is manually rotated to drive the active retraction wheel 64 to rotate, and the driven retraction wheel 63 rotates synchronously and drives the firing rack 5 to retract.

Claims

1. A multifunctional stapler, characterized in that: It comprises a firing generator (6), a firing rack (5), and a firing wheel (62) respectively connected to the firing generator (6) and the firing rack (5); and further comprises: A control circuit, comprising a current limiting protection unit and at least three switching switches, wherein the at least three switching switches are respectively a first switching switch (SW1), a second switching switch (SW2) and a third switching switch (SW3), and each of the switches has a common terminal, a normally closed terminal and a normally open terminal; A third switch switching structure, used to trigger the third switch (SW3) to switch to the conduction between the common end and the normally open end, so that the strike generator (6) is started when the current limiting protection unit is turned on; A second switch switching structure is used to trigger the second switch (SW2) to switch between the common end and the normally open end, so that the current limiting protection unit is disconnected after the striking generator (6) is started, and the striking generator (6) is maintained in operation; A first switch switching structure, used to trigger the first switch (SW1) to switch between the common terminal and the normally open terminal to cut off the current flowing through the generator (6); The manual retraction anti-reuse structure is used to manually retract the firing rack (5) and disconnect the engagement between the firing wheel (62) and the firing rack (5).

2. The multifunctional stapler according to claim 1, characterized in that: The common end of the third switch (SW3) is connected to one end of the strike generator (6), the normally open end is connected to one end of the current limiting protection unit, and the normally closed end is connected to a power supply electrode; The common end of the second switch (SW2) is connected to another power supply electrode, the normally open end is connected to the first switch end of the third switch (SW3), and the normally closed end is connected to the other end of the current limiting protection unit; The common end of the first switching switch (SW1) is connected to the other end of the striking generator (6), the normally open end is connected to the other power supply electrode, and the normally closed end is connected to a power supply electrode.

3. The multifunctional stapler according to claim 1, characterized in that: The firing rack (5) is provided with a first sliding groove (51) having a front inner wall (511) and a rear inner wall (512); the first switch switching structure comprises: A first switching switch (SW1) is provided with a first switching contact (11); and A first switching trigger member (12) is used for being movably connected to the stapler, and is provided with a first trigger portion (121) adjacent to the switching contact, and a first toggle portion (122) inserted into the first slide groove (51); One side of the first toggle portion (122) is abutted by the front inner wall (511), causing the first switching trigger member (12) to deflect in a direction where the trigger member is close to the switching contact; the other side of the first toggle portion (122) is abutted by the rear inner wall (512), causing the first switching trigger member (12) to deflect in a direction where the trigger member is away from the switching contact.

4. The multifunctional stapler according to claim 3, characterized in that: One end of the firing rack (5) is provided with an oblique opening (52); the second switch switching structure comprises: A second switching trigger member (22) is placed obliquely on the oblique opening (52), and a second trigger portion (221) is provided on one side; and The second switching switch (SW2) is arranged adjacent to the second trigger portion (221), and is provided with a second switching contact (21) which is adjacent to the second trigger portion (221) and is contacted by the second trigger portion (221).

5. The multifunctional stapler according to claim 1, characterized in that: The third switch switching structure includes: A third switching trigger member (32) is provided with a third trigger portion (321) and a coil spring used for resetting the third switching trigger member (32); A third switching switch (SW3) is provided with a third switching contact (31) contacted by a third triggering portion (321); A firing handle (84) is used to drive the staple cartridge assembly (82) to perform a staple cutting action, and to drive the third switching trigger member (32) to rotate so that the third trigger portion (321) contacts the third switching contact point (31); The anastomosis handle (83) is used to drive the staple cartridge assembly (82) to perform an anastomosis action, and is used to drive the firing handle (84) adjacent to the third switching trigger member (32).

6. The multifunctional stapler according to claim 1, characterized in that: The manual fallback anti-reuse structure includes: A driven retracting wheel (63) meshes with the firing rack (5), is coaxially connected to the firing wheel (62), and is closely adjacent to the firing wheel (62), and is provided with a first offset engaging portion (631) on one end surface close to the firing wheel (62); An active retracting wheel (64) is transmission-connected to the driven retracting wheel (63); A wrench (7) for rotating the active retracting wheel (64) and pressing down the driven retracting wheel (63); Wherein, an end surface of the firing wheel (62) close to the driven retracting wheel (63) is provided with a second misaligned engagement portion (621) engaged by a first misaligned engagement portion (631) so that the teeth of the firing wheel (62) and the teeth of the driven retracting wheel (63) are misaligned.

7. A multifunctional stapler control method, characterized in that: The steps include: Initialization steps: configuring the first trigger portion (121) of the first switching trigger member (12) to be separated from the first switching contact (11); placing the second switching trigger member (22) at the oblique opening (52) of the firing rack (5), and separating the second trigger portion (221) from the second switching contact (21); separating the third trigger portion (321) of the third switching trigger member (32) from the third switching contact (31); and respectively connecting the common end of the first switching switch (SW1), the second switching switch (SW2), and the third switching switch (SW3) to the normally closed end; Anastomosis step: pinching the anastomosis handle (83) to drive the staple cartridge assembly (82) to perform anastomosis; Firing current limiting step: pinching the firing handle (84), rotating the third switching trigger member (32) so that the third trigger portion (321) contacts the third switching contact (31), thereby triggering the third switching switch (SW3) to switch between the common end and the normally open end, causing the firing generator (6) to rotate forward and drive the firing rack (5) forward; Full-force firing steps: the second switching trigger member (22) is separated from the oblique opening (52) and contacts the guide surface (53), the second switching trigger member (22) is elastically twisted, so that the second trigger portion (221) contacts the second switching contact (21), triggering the second switching switch (SW2) to switch between the common end and the normally open end, and the firing generator (6) continues to drive the firing rack (5) forward with full force, and the firing rod is pushed forward by the firing rack (5) to drive the nail magazine assembly (82) to perform the nailing and cutting action.

8. The multifunctional stapler control method according to claim 7, characterized in that: The full-strike step also includes: Firing to the end step: the firing rack (5) is pushed forward until the first switching switch (SW1) is triggered to switch the common end and the normally open end to conduction, an equipotential voltage is formed at both ends of the firing generator (6) to block the flow of current, and the firing generator (6) stops rotating; Initial step of retreat: releasing the firing handle (84), triggering the third switch (SW3) to switch between the common terminal and the normally closed terminal, causing the firing generator (6) to reverse and drive the firing rack (5) to retreat; The latter step of retreating: the firing rack (5) retreats until the second switching switch (SW2) is triggered to switch between the common terminal and the normally closed terminal; The step of returning to the bottom: the firing rack (5) returns until the first switching switch (SW1) is triggered to switch between the common end and the normally closed end.

9. The multifunctional stapler control method according to claim 8, characterized in that: Determine whether the firing rack (5) is stuck in any step between the full-strength firing step and the back-retracting step. If so, perform the following steps: First pre-installation step: opening the safety cover (81); Second pre-installation step: the wrench (7) is connected to the active retracting wheel (64), and the driven retracting wheel (63) and the firing wheel (62) are pressed downward until the teeth of the firing wheel (62) are separated from the teeth of the firing rack (5), and the elastic member (66) generates elastic force; Anti-reuse step: the driven retracting wheel (63) rotates to cause the misaligned protrusion (631a) to fit into the misaligned groove (621a), so that the teeth between the firing rack (5) and the firing wheel (62) are misaligned, and under the action of the elastic member (66), the firing wheel (62) is stuck at the bottom of the firing rack (5); Retraction step: The wrench (7) drives the driven retraction wheel (63) to rotate relative to the firing wheel (62), so that the firing rack (5) retracts.

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