Motor control circuit, electric device, quick-stop anastomat and method

Abstract

The invention relates to the technical field of motor control circuits and anastomats, in particular to a motor control circuit, an electric device, a quick-stop anastomat and a method. The invention discloses a motor control circuit, and aims to realize precise control on motor driving through precise circuit control and a synergistic effect of a multi-step change-over switch, so as to ensure that a stapling and cutting process of an anastomat is efficient and safe. The circuit comprises an impact generator, a current-limiting protection unit and at least three change-over switches, the at least three change-over switches are respectively a first change-over switch, a second change-over switch and a third change-over switch, each change-over switch is provided with a common end, a first change-over end and a second change-over end, and positive and negative rotation and stalling of the motor are controlled through cooperation of the switches. According to the scheme, on-off of the current is effectively and timely controlled, and the driving process of the motor is further optimized. The circuit is simplified, and meanwhile, the percussion stroke is accurately controlled, and the generator is quickly stopped and struck.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control circuits and staplers, and in particular to a motor control circuit, an electric device, a quick-stop stapler and a method. Background Art

[0002] In medical devices or small electric devices (such as electric staplers and quick-stop electric tools), motors are often required to drive actuators to complete specific actions, such as stapling, cutting, or retraction. In order to provide current limiting protection, quick shutdown, or reverse drive for the motor at different stages, multiple switching switches are usually arranged in the circuit to control the on / off and voltage polarity of the motor in steps.

[0003] For example, Chinese invention patent CN106821437B discloses a stapler control circuit and an electric stapler, which can drive a motor to perform stapling or retraction functions by switching a switch and a basic circuit design.

[0004] However, in more complex applications, if multiple functions such as current limiting protection, staged drive, and rapid shutdown need to be implemented in the same circuit, while ensuring that the motor is fully protected under fault or high load conditions, existing technologies often lack a fine division of switch port definitions or effective integration of current limiting units, resulting in increased circuit complexity or limited operational flexibility. Summary of the invention

[0005] The purpose of the present invention is to provide a motor control circuit, an electric device, a quick-stop stapler and a method to address the deficiencies in the prior art, aiming to provide flexible control and safety assurance in various working modes such as motor start-up, full operation and quick shutdown, so as to improve the reliability and use efficiency of the electric device (such as an electric stapler).

[0006] The present invention achieves the above-mentioned object through the following technical scheme: a motor control circuit, comprising a generator, 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 first switching terminal and a second switching terminal; wherein: A third switching switch, the common end of which is connected to one end of the striking generator, the first switching end of which is connected to one end of the current limiting protection unit, and the second switching end of which is connected to a power supply electrode; A second switch, wherein the common end is connected to another power supply electrode, the first switch end is connected to the first switch end of the third switch, and the second switch end is connected to the other end of the current limiting protection unit; The first switching switch has a common end connected to the other end of the striking generator, a first switching end connected to another power supply electrode, and a second switching end connected to a power supply electrode.

[0007] Furthermore, the current limiting protection unit includes a current limiting resistor, a thermistor and a current limiting disconnect switch connected in series; The current limiting disconnect switch has a first end and a second end that can be turned on and off, the second end is electrically connected to one end of the current limiting resistor, and one end of the thermistor is electrically connected to the other end of the current limiting resistor; The common end of the third switch is connected to one end of the strike generator, the first switch end is connected to the other end of the thermistor, and the second switch end is connected to the power supply electrode.

[0008] Furthermore, the switching switch also includes a fourth switching switch, the first switching end of the first switching switch and the common end of the second switching switch are connected to the second switching end of the fourth switching switch, and are connected to the other power supply electrode through the common end of the fourth switching switch.

[0009] Furthermore, the motor control circuit also includes a power indication module, one end of which is connected to the one power electrode, and the other end is connected to the other power electrode. The current limiting protection unit includes: a resistor array, which is composed of at least two resistors connected in parallel or in series, and one end is connected to the second switching end of the second switching switch; and a thermistor, one end of which is connected in series to the other end of the resistor array, and the other end is connected to the first switching end of the third switching switch.

[0010] An electric device driven by a motor comprises any one of the motor control circuits described above.

[0011] A quick-stop stapler comprises a main body and a control circuit, wherein the control circuit is a motor control circuit as described in any one of the above, and the main body comprises: A firing handle, used to trigger the switching of the third switching switch; and The firing rack is driven forward and backward by the firing generator; Among them, the switching of the second switching switch is triggered by the firing rack moving to a predetermined position until the second trigger part contacts the second switching contact of the second switching switch; the switching of the first switching switch is triggered by the firing rack moving to a preset position, causing the first switching switch to deflect, until the first trigger part contacts the first switching contact.

[0012] Furthermore, the main body also includes: a firing rod, which is driven forward and backward by a firing rack; and a staple cartridge assembly, which is used for stapling and cutting human tissues, and is driven and controlled by the firing rod to perform stapling and cutting actions; Among them, when the firing handle is pinched, the third switching switch switches from the conduction between the common end and the second switching end to the conduction between the common end and the first switching end; when the firing handle is released, the third switching switch switches from the conduction between the common end and the first switching end to the conduction between the common end and the second switching end.

[0013] A stapler firing control method comprises the following steps: Initialization step: the first switch, the second switch, the third switch and the fourth switch are all configured to be conductive between the common terminal and the normally closed terminal; the current limiting disconnect switch is configured to be conductive between the first terminal and the second terminal; Anastomosis steps: pinch the anastomosis handle to drive the staple cartridge assembly to perform anastomosis; Firing current limiting steps: pinching the firing handle triggers the third switch to switch the common end and the normally open end to conduction, the current limiting protection unit is energized, the firing generator rotates forward, and drives the firing rack forward; Full-strength firing steps: the firing rack is pushed forward, triggering the second switch to switch to the conduction between the common end and the normally open end, the current limiting protection unit is powered off, and the firing generator continues to drive the firing rack forward with full strength; Current limiting switch cutting step: after the full-strike step, the firing rack continues to be pushed forward until the front inner wall of the firing rack pushes open the current limiting dial portion of the current limiting disconnect trigger, so that the current limiting disconnect trigger and the current limiting reset dial button are synchronously deflected, the current limiting trigger portion and the current limiting disconnect contact are separated, and the first end and the second end of the current limiting disconnect switch are disconnected; Firing to the end step: after the full-strength firing step or the current limiting switch cutting step, the firing rack continues to be pushed forward until the first switching switch is triggered to switch the common end and the normally open end to conduction, and an equipotential voltage is formed at both ends of the firing generator to block the current flow, and the firing generator stops rotating; Initial step of retreat: release the firing handle, trigger the third switch to switch between the common end and the normally closed end, reverse the firing generator, and drive the firing rack to retreat; The latter step of retreating: the firing rack retreats until the second switching switch is triggered to switch the common end and the normally closed end to conduction; Backing off to the bottom step: the firing rack is backed off until the first switching switch is triggered to switch between the common end and the normally closed end; Warning step: perform the anastomosis step and / or the firing current limiting step again. If the firing generator does not start and cannot drive the rack forward or backward, it means that the staple cartridge assembly may have been used or not installed, and a stall occurs during the current limiting period; Reset step: manually turn the current limit reset button to deflect the current limit switch trigger in the reset direction until the current limit trigger part contacts the current limit switch contact again, and the first end and the second end of the current limit switch are connected again. After the reset step, the matching step and / or the firing current limit step are performed again to start the firing generator to drive the firing rack to move forward and backward.

[0014] Beneficial effects of the present invention: The following effects are achieved by combining a strike generator, a current limiting protection unit and at least three switching switches (each having a common terminal, a first switching terminal and a second switching terminal): 1. Drive in stages, taking into account both current limiting and high efficiency. The third switch is connected to the current limiting protection unit at the beginning of the motor startup to prevent overcurrent shock; then the second switch disconnects the current limiting protection unit, allowing the motor to enter full output, taking into account both startup protection and efficient operation.

[0015] 2. Quick shutdown and safe power off. The first switch can be switched at the end of the motor stroke or when a fault occurs, making the potential at both ends of the motor equal or completely disconnecting the circuit, achieving a non-delayed shutdown and preventing the motor from continuing to rotate, thereby improving safety.

[0016] 3. The circuit is simple and has high scalability. Through the reasonable configuration of the common terminal, the first switching terminal, and the second switching terminal, each switch can switch the power polarity or disconnect the circuit in different strokes or states, simplifying the external wiring and facilitating the use with other functions (such as manual fallback and anti-reuse).

[0017] 4. Reliable overload protection. The current limiting protection unit may include resistors, thermistors and on-off switches to ensure that the circuit is cut off in time under high load or fault conditions, protect the motor and other key components, and remind the operator to perform maintenance or replacement.

[0018] In summary, by carefully arranging the first, second, and third switching switches and the current limiting protection unit in the circuit, this solution can provide flexible control and safety protection in various working modes such as motor start-up, full operation, and rapid shutdown, effectively improving the reliability and use efficiency of electric devices (such as quick-stop staplers). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the initial state of the motor control circuit.

[0020] Figure 2 This is a circuit diagram of the firing current limiting state of the motor control circuit.

[0021] Figure 3 This is a circuit diagram of the motor control circuit in the full-fire state.

[0022] Figure 4 This is a circuit diagram of the motor control circuit in the fully fired state.

[0023] Figure 5 This is a circuit diagram of the motor control circuit returning to the initial state.

[0024] Figure 6 The circuit diagram of the motor control circuit in the fallback state.

[0025] Figure 7 This is a circuit diagram of the motor control circuit in the bottom return state.

[0026] Figure 8 A circuit diagram showing the reset state of the motor control circuit.

[0027] Fig. 9 This is a circuit diagram of the active retraction state during the firing process of the motor control circuit.

[0028] Fig.10 This is a circuit diagram for the motor control circuit to manually retract when the safety cover is opened.

[0029] Fig.11 This is a schematic diagram of the structural decomposition and partial structure enlargement of the stapler switching switch structure.

[0030] Fig.12 Schematic diagram of the structure of the stapler switching switch in two switching states.

[0031] Fig.13 It is a structural schematic diagram of the stapler toggle switch switching structure in two switching states.

[0032] Fig.14 This is a schematic diagram of the structural decomposition and partial structure enlargement of the toggle switch switching structure of the stapler.

[0033] Fig.15 It is a schematic diagram of the structure between the anastomosis handle, the firing handle and the third switch when the stapler is in the anastomosis and firing states.

[0034] Fig.16 It is a schematic diagram showing the structural decomposition and partial structural enlargement of the first switching trigger member and the mounting frame.

[0035] Fig.17 It is a schematic diagram of the local structure of the first switching trigger component in two states.

[0036] Fig.18 It is a schematic diagram of the structure of the current limiting disconnect switch structure in the decomposed and non-decomposed states.

[0037] Fig.19 It is a schematic diagram of the structure of a part of the structure decomposition of the present invention.

[0038] Fig. 20 Schematic diagram of the structure of the stapler active retraction structure in two states.

[0039] Fig.21 It is a schematic diagram of the structure of the firing wheel and the driven retracting wheel of the present invention at two different viewing angles and an enlarged schematic diagram of the local structure.

[0040] Fig. 22 It is a structural schematic diagram of another part of the structure of the present invention.

[0041] Fig.23It is an enlarged schematic diagram of the overall structure and local structure of the present invention.

[0042] Fig.24 It is a schematic diagram of the connection structure between the active retraction wheel and the circuit board of the present invention.

[0043] Fig.25 Schematic diagram of the manual retraction process of the stapler of the present invention.

[0044] Fig.26 It is a schematic diagram of the switching structure of the toggle switch of the stapler of the present invention.

[0045] Fig. 27 for Fig.26 Figure A is a schematic diagram of the structure from another perspective.

[0046] Fig.28 It is a schematic diagram of the structure of the stapler toggle switch switching structure after being installed in the mounting frame of the present invention. DETAILED DESCRIPTION

[0047] like Figure 1 to Figure 10 As shown, a motor control circuit includes a generator 6, a current limiting protection unit and a plurality of switching switches, wherein 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, wherein 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 thermistor and a current limiting disconnect switch 4 connected in series, the current limiting element is a current limiting resistor R, the thermistor is a thermistor PTC, the current limiting disconnect switch 4 has a first end S4-1 and a second end S4-2, the first end S4-1 and the second end S4-2 can be switched on and off, 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 switch SW3 has a common terminal connected to the negative electrode of the strike generator 6, a normally open terminal connected to the other end of the thermistor PTC, and a normally closed terminal connected to the negative terminal of the power supply; The second switch SW2 has a common end connected to the normally closed end of the fourth switch SW0, a normally open end connected to the normally open end of the third switch SW3, and a normally closed end connected to the first end S4-1; The first switch SW1 has a common terminal connected to the positive pole of the strike generator 6, a normally open terminal connected to the normally closed terminal of the fourth switch SW0, and a normally closed terminal connected to the negative terminal of the power supply; The fourth switch SW0 has a common terminal connected to the positive terminal of the power supply and a normally open terminal left vacant.

[0048] Furthermore, the motor control circuit is also connected in parallel with an indicator light module. Specifically, one end of the indicator light module is electrically connected to the normally closed end of the fourth switch SW0, and the other end of the indicator light module is connected to the normally closed end of the first switch SW1 and / or the negative pole of the power supply.

[0049] It should be noted that the motor control circuit can be used in the field of staplers and other fields with motors.

[0050] A stapler switch structure, such as Fig.11 , Fig.12 As shown, it includes: a firing rack 5, a second switching trigger 22, and a second switching switch SW2. The firing rack 5 has a first avoidance position 52 at one end; The second switching trigger member 22 is placed obliquely at the first avoidance position 52, and a second trigger portion 221 is provided on one side; The second switch SW2 is disposed adjacent to the second trigger portion 221 , and is provided with a second switch contact 21 which is adjacent to the second trigger portion 221 and is contacted by the second trigger portion 221 .

[0051] Furthermore, a plug-in interface 201 is provided on one side of the second switching switch SW2, and the second switching trigger 22 is provided with a pin 222 which is tightly inserted into the plug-in interface 201. The second switching trigger 22 is an elastic component with a certain elastic deformation performance, which is used to generate elastic deformation when the second switching trigger 22 is separated from the first avoidance position 52, so that the bottom of the second switching trigger 22 is adjacent to the first avoidance position 52 and resets to the first avoidance position 52, thereby separating the second trigger part 221 and the second switching contact 21 of the second switching switch SW2.

[0052] Furthermore, the contact between the second triggering portion 221 of the second switching trigger 22 and the second switching contact 21 of the second switching switch SW2 is achieved by elastic deformation of the bottom of the second switching trigger 22, ensuring that the second switching switch SW2 is always pressed; one side of the firing rack 5 is provided with a guide surface 54 that is contacted by the bottom of the second switching trigger 22 and extends toward the first avoidance position 52. When the second switching trigger 22 is placed in the first avoidance position 52, the second triggering portion 221 is separated from the second switching contact 21 of the second switching switch SW2; when the bottom of the second switching trigger 22 is separated from the first avoidance position 52 and contacts the guide surface 54, the second triggering portion 221 contacts the second switching contact 21 of the second switching switch SW2. Specifically, the tip of the angle formed between the guide surface 54 and the guide inclined surface 53 of the first avoidance 52 will abut 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 the pin 222, the bottom of the second switching trigger member 22 will undergo a certain elastic torsion due to the abutment of the tip of the angle, so that the second trigger portion 221 of the second switching trigger member 22 abuts against the second switching contact 21 of the second switching switch SW2, thereby realizing the switching of the second switching switch SW2, that is, the second switching switch SW2 is switched from being connected between the common end and the normally closed end to being connected between the common end and the normally open end.

[0053] A stapler switch switching structure, such as Figure 26-Figure 28 , including: a mounting frame 8, a firing rack 5, a second trigger switching member 23 and a second switching switch SW2. Among them: the mounting frame 8 is formed with a guide slide groove opening 87; the firing rack 5 is provided with a second avoidance position 55; the second trigger switching member 23 includes a guide connection portion 231 inserted in the guide slide groove opening 87, and a second contact portion 232 integrally formed with the guide 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 that is adjacent to the second contact portion 232 and is contacted by the second contact portion 232. The firing rack 5 is provided with a guide surface 54, the second avoidance position 55 is provided at one end of the guide surface 54, and a guide inclined surface 53 is provided between the second avoidance position 55 and the guide surface 54. See Fig.26 In FIG. A, before firing, the second contact portion 232 is separated from the second switching contact 21; when firing, the firing rack 5 moves forward, so that the second contact portion 232 of the second trigger switching member 23 is lifted, and the guide connecting portion 231 rises along the guide sliding groove 87, and the second contact portion 232 is separated from the second avoidance position 55 until the second contact portion 232 contacts the second switching contact 21. Fig.26 Figure B shows the switch switching.

[0054] A toggle switch switching structure of a stapler, such as Fig.13 , Fig.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 slide groove 51 having a front inner wall 511 and a rear inner wall 512; The first switch SW1 is provided with a first switching contact 11; The first switching trigger member 12 is used to be movably connected to the stapler, and is provided with a first trigger portion 121 adjacent to the first switching contact 11, and a first toggle portion 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.

[0055] 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.

[0056] Furthermore, if Fig.18 , Fig.19 , Fig. 22As shown, it also includes a current limiting disconnect switch 4, a current limiting disconnect trigger 42 and a current limiting reset dial button 43. Among them: the current limiting disconnect switch 4 is provided with a current limiting disconnect contact 41; the current limiting disconnect trigger 42 is provided with a current limiting trigger portion 421 adjacent to the current limiting disconnect contact 41, and a first slide groove 51 extending into the firing rack 5, and is pushed against by the front inner wall 511 and rotated, so that the current limiting trigger portion 421 contacts the current limiting dial portion 422 of the current limiting disconnect contact 41; The current limiting reset dial button 43 has one end connected to the current limiting disconnect trigger 42, and is used to receive manual force to rotate the current limiting disconnect trigger 42 to reset, so that the current limiting trigger part 421 is separated from the current limiting disconnect contact 41, and the current limiting receiving part 422 is re-entered into the first slide slot 51. Specifically, the first end S4-1 of the current limiting disconnect switch 4 is set on the current limiting disconnect contact 41, and the second end S4-2 is set on the current limiting trigger part 421; or, the first end S4-1 is set on the current limiting trigger part 421, and the second end S4-2 is set on the current limiting disconnect contact 41. In detail, combined with Figures 1 to 10 , in the state of waiting to fire, the flow-limiting disconnect switch 4 is in the on state; after firing, the front inner wall 511 of the firing rack 5 will be pressed against the flow-limiting dial portion 422, causing the flow-limiting disconnect trigger 42 to deflect, so as to disconnect the connection between the current-limiting trigger portion 421 and the flow-limiting disconnect contact 41, and then disconnect the flow-limiting disconnect switch 4, so that the current-limiting protection unit is disconnected. After the firing is completed and retracted to the bottom, the flow-limiting disconnect switch 4 is still in the off state and cannot be automatically reset. Therefore, the stapler cannot be fired again. The current-limiting reset dial 43 must be manually turned to make the flow-limiting disconnect trigger 42 rotate synchronously to fully reset. In this way, the flow-limiting disconnect switch 4 can effectively prevent misfiring, and at the same time, it can effectively remind the operating doctor that the stapler has been fired at this time, and a new staple cartridge assembly 82 must be replaced, and then the flow-limiting disconnect switch 4 must be manually reset before it can be stapled and fired again, effectively avoiding the situation of stapler cutting of the empty staple cartridge of the staple cartridge assembly 82 that has been used, and the safety factor is higher.

[0057] Further, see Fig.14 In FIG. B, the first switching trigger member 12 is provided with a limit convex point 124. Fig.16 The mounting frame 8 is provided with a limiting convex groove 85 into which the limiting convex point 124 is engaged; the mounting frame 8 is also provided with a mounting shaft 86 hinged by the hinge portion 123 of the first switching trigger member 12. For details, see Fig.14 , Fig.16 and Fig.17 , there are two limit protrusions 124, namely protrusion 124a and protrusion 124b; there are three limit protrusions 85, namely protrusion 85a, protrusion 85b and protrusion 85c. Before the stapler is fired, the first trigger part 121 of the first switching trigger member 12 is separated from the first switching contact 11 of the first switching switch SW1. Fig.16and Fig.17 In FIG. A, the convex point 124a and the convex point 124b are respectively inserted into the convex groove 85a and the convex groove 85b, so that the firing rack 5 maintains the stability of the first switching trigger member 12 during the firing process, so that the first trigger portion 121 and the first switching contact 11 are always separated, and the first switching trigger member 12 is prevented from moving and causing poor contact. Figures 1 to 3 In the process, the first switch SW1 always maintains the state of 1-3 on and 1-2 off. When the firing rack 5 is fired to the bottom, the front inner wall 511 of the first slide slot 51 moves the first switching trigger 12 to deflect. Fig.17 In FIG. B, the convex point 124a and the convex point 124b are respectively inserted into the convex groove 85b and the convex groove 85c, so that during the subsequent retreat process of the firing rack 5, the first triggering portion 121 is always in contact with the first switching contact 11, that is, Figures 4 to 6 In the process, the first switching switch SW1 always maintains the state of 1-2 being on and 1-3 being off until the firing rack 5 retreats to the bottom, so that the rear inner wall 512 of the first sliding groove 51 drives the first switching trigger member 12 to deflect and reset.

[0058] An active stop structure for a stapler includes any one of the aforementioned toggle switch switching structures for a stapler, and also includes an active stop dial button 67 provided with a second slide groove 671, which is used to manually push the first switching trigger member 12 to deflect; the first switching trigger member 12 is also provided with a second toggle portion 125 inserted into the second slide groove 671. A side of the second toggle portion 125 close to the active stop dial button 67 is provided with an avoidance notch 125a. Specifically, the active stop dial button 67 moves forward and backward, toggling the second toggle portion 125 of the first switching trigger member 12 to rotate the first switching trigger member 12, so as to turn on and off the first switching switch SW1.

[0059] An active retraction structure of a stapler, such as Figure 19-Figure 23 As shown, it 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; and also includes a driven retracting wheel 63 and an active retracting wheel 64. The driven retracting wheel 63 is meshed with the firing rack 5. The active retracting wheel 64 is meshed with the driven retracting wheel 63, and the active retracting wheel 64 is provided with a first limit force applying portion 641 for rotating the active retracting wheel 64 by applying force from the outside.

[0060] Furthermore, the stapler active retraction structure also includes a guide shaft 65, and 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 the end of the firing wheel 62 away from the driven retraction wheel 63. It also includes a wrench 7 for rotating the active retraction wheel 64, and the wrench 7 is provided with a second position-limiting force-applying portion 71 that matches the first position-limiting force-applying portion 641, so that the active retraction wheel 64 is force-applied by the wrench 7. The first position-limiting force-applying portion 641 is a force-applying shaft, and the second position-limiting force-applying portion 71 is a position-limiting connection port. The force-applying shaft is provided with an external thread, and the position-limiting connection port is provided with an internal thread matching the external thread. The wrench 7 is provided with a pressing portion 72, and a pressed portion 632 pressed against by the pressing portion 72 is provided on the top of the driven retracting wheel 63; the wrench 7 is also used to press the driven retracting wheel 63 and the firing wheel 62 by pressing the pressing portion 72 against the pressed portion 632. A detachable safety cover 81 is provided on the main body of the stapler, and the safety cover 81 is located on the top of the first position limiting force applying portion 641. Opening the safety cover 81 can expose the first position limiting force applying portion 641 of the active retracting wheel 64, so that the wrench 7 can be connected and manually apply force to the active retracting wheel 64 and rotate it.

[0061] In addition, if Fig.24 As shown, the stapler of this scheme also includes a circuit board 88, and a coupling hole 881 is opened on the circuit board 88. The first limit force-applying part 641 of the active retraction wheel 64 is inserted into the coupling hole 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 limit force-applying part 641 to the bottom until the active retraction wheel 64 and the circuit board 88 are slightly tightened, and the active retraction wheel 64 can be rotated by the wrench 7. In addition, the active retraction wheel 64 can also be movably inserted into the circuit board 88 by setting a bearing. See the active retraction step. Fig.25 As shown in Figure A, open the safety cover 81, as shown in Figure B, screw in the wrench 7 to separate the firing generator 6 from the firing rack 5, as shown in Figure C, screw the wrench 7 clockwise to the bottom and press the reset button to open the jaws.

[0062] A one-way transmission type stapler, such as Figure 19-Figure 23 As shown, it includes a firing generator 6, a firing rack 5, and a firing wheel 62; it also includes: a driven retracting wheel 63, an active retracting wheel 64, a wrench 7, a guide shaft 65 and an elastic member 66. Among them: The firing wheel 62 is meshed and connected with the firing generator 6 and the firing rack 5 respectively; The driven retracting wheel 63 is coaxially connected to the firing wheel 62 and is adjacent to the firing wheel 62. A first offset engaging portion 631 is provided on one end surface close to the firing wheel 62. The active retracting wheel 64 is meshingly connected to the driven retracting wheel 63; The wrench 7 is used to rotate the active retracting wheel 64 and press down the driven retracting wheel 63; The guide shaft 65 is coaxially disposed through the firing wheel 62 and the driven retracting wheel 63, respectively, so that the firing wheel 62 and the driven retracting wheel 63 can slide on the guide shaft 65; The elastic member 66 is sleeved on the guide shaft 65 and acts on the firing wheel 62 to maintain the firing wheel 62 at a predetermined position on the guide shaft 65 where it can mesh with the firing rack 5, and provides a restoring elastic force for the firing wheel 62 when the firing wheel 62 is pressed down; Among them, one 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.

[0063] Furthermore, if Fig.21 As shown in Figures A and B of the embodiment, the first misaligned engagement portion 631 is a misaligned protrusion 631a, and the second misaligned engagement portion 621 is a misaligned groove 621a. When the misaligned protrusion 631a is inserted into the misaligned groove 621a, the teeth of the firing wheel 62 and the teeth of the driven retracting wheel 63 are misaligned with each other. A first one-way limiting surface 631a1 is provided at one end of the misaligned protrusion 631a, and a first one-way guiding inclined surface 631a2 is provided at the other end. A second one-way limiting surface 621a1 is provided at one end of the misaligned groove 621a, which is abutted by the first one-way limiting surface 631a1, and a second one-way guiding inclined surface 621a2 is provided at the other end. Furthermore, when the offset protrusion 631a is inserted into the offset groove 621a and the driven retraction wheel 63 rotates in the forward direction (clockwise) of the firing rack 5, the driven retraction wheel 63 rotates synchronously with the firing wheel 62; and when the offset protrusion 631a is inserted into the offset groove 621a and the driven retraction wheel 63 rotates in the retraction direction (counterclockwise) of the firing rack 5, the driven retraction wheel 63 and the firing wheel 62 can rotate relative to each other, such as the firing wheel 62 is stationary while the driven retraction wheel 63 rotates, thereby realizing one-way transmission.

[0064] Furthermore, a first position-limiting force-applying portion 641 is provided on the top of the active retracting wheel 64; the wrench 7 is provided with a second position-limiting force-applying portion 71 matched with the first position-limiting force-applying portion 641 so as to apply force to the active retracting wheel 64 through the wrench 7; and a safety cover plate 81 is provided on the top of the active retracting wheel 64. Specifically, the second position-limiting force-applying portion 71 is a position-limiting connection port with an internal thread, and the first position-limiting force-applying portion 641 is a force-applying shaft inserted into the position-limiting connection port, and the force-applying shaft is provided with an external thread matching the internal thread.

[0065] Manual retraction process: open the safety cover 81 to expose the force-applying shaft at the top of the active retraction wheel 64, align the limit connection port of the wrench 7 with the force-applying shaft and tighten it until the wrench 7 is pressed down and pre-tightened on the active retraction wheel 64. During the pressing process, the pressing portion 72 of the wrench 7 hits the pressed portion 632 at the top of the driven retraction wheel 63, so as to press the driven retraction wheel 63 and the firing wheel 62 down for a certain stroke until the firing wheel 62 is separated from the firing rack 5, and the elastic member 66 is pressed to generate a reset elastic force, After the firing wheel 62 is separated from the firing rack 5, when the wrench 7 is continuously turned, the driven retracting wheel 63 rotates, and the dislocation protrusion 631a can be inserted into the dislocation groove 621a. At this time, the teeth between the firing wheel 62 and the driven retracting wheel 63 are dislocated with each other (i.e., the gears of the two are dislocated). Since the driven retracting wheel 63 is still meshed with the firing rack 5, the teeth between the firing wheel 62 and the firing rack 5 are also dislocated, 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 bevel 631a2 and the second one-way guide bevel 621a2, if the wrench 7 is turned to rotate the driven retracting wheel 63 counterclockwise, the driven retracting wheel 63 can still continue to rotate in the counterclockwise direction, so that the firing rack 5 drives the firing rod to continue to retract, thereby ensuring the manual retraction function.

[0066] On the other hand, the offset protrusion 631a is inserted into the offset groove 621a. If the wrench 7 is turned to make the driven retraction wheel 63 move clockwise, due to the structural design that the first one-way limiting surface 631a1 abuts against the second one-way limiting surface 621a1, the driven retraction wheel 63 and the firing wheel 62 will move synchronously. However, the firing wheel 62 is always engaged with the output wheel 61 on the output shaft of the striking generator 6, and the striking generator 6 is not working at this time. Therefore, it is affected by the braking of the striking generator 6 and the driven retraction wheel 63 cannot rotate clockwise. Furthermore, it is ensured that the teeth between the driven retracting wheel 63 and the firing wheel 62 are always misaligned, and the teeth between the firing rack 5 and the firing wheel 62 are always misaligned, which prevents the teeth of the firing wheel 62 from realigning with the teeth of the firing rack 5, causing the firing wheel 62 to slide again and mesh with the firing rack 5 under the pressure of the elastic member 66, that is, the firing wheel 62 and the firing rack 5 cannot be re-engaged after the downward pressure of the wrench 7 is withdrawn. The teeth between the firing wheel 62 and the firing rack 5 are prevented from being re-engaged and reset, and the stapler that has failed is prevented from being put into use again. After the stapler that has failed is manually retracted, the anti-reuse function and effect can be achieved at the same time, effectively avoiding the safety hazards caused by reusing the stapler that has failed.

[0067] 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 advance and retreat. Thus, the possibility of the stapler being reused after manual retreat after being stuck is avoided.

[0068] like Fig.21 As shown, the first staggered joint portion 631 is a right-angled trapezoidal projection structure, and the second staggered joint portion 621 is a trapezoidal projection groove structure that matches the right-angled trapezoidal projection and is engaged by the right-angled trapezoidal projection.

[0069] In detail, Fig.21 As shown, the second misaligned engagement portion 621 is a trapezoidal protrusion, and the first misaligned engagement portion 631 is a trapezoidal protrusion that matches the trapezoidal protrusion and is engaged by the trapezoidal protrusion.

[0070] Staple / clamp process: Engage the stapling handle 83 to close the staple cartridge assembly 82 to clamp the tissue to be cut and stapled.

[0071] Firing process: pinch the firing handle 84, one end of the firing handle 84 presses against one end of the third switching trigger member 32, so that the third switching trigger member 32 rotates until the third switching trigger member 32 contacts the third switching switch SW3, so that the third switching switch SW3 switches from the conduction between the common end and the normally closed end to the conduction between the common end and the normally open end, thereby triggering the firing generator 6 to rotate forward, so as to drive the firing wheel 62 to rotate clockwise, and the firing wheel 62 drives the firing rack 5 forward, and the firing rack 5 pushes the firing rod forward, and the firing rod pushes forward to drive the closed nail magazine assembly 82 to perform the cutting and stapling action, thereby completing the cutting and stapling of the tissue.

[0072] Automatic retraction process: Release the firing handle 84 to reset the third switching trigger 32 and disconnect it from the third switching switch SW3, so that the third switching switch SW3 switches back to the conduction between the common end and the normally closed end, thereby triggering the firing generator 6 to reverse, so as to drive the firing wheel 62 to rotate counterclockwise, thereby driving the firing rack 5 and the firing rod to retract.

[0073] In yet another embodiment, Fig.19 and Fig. 22 As shown, the percussion generator 6 is provided with a transmission output wheel 61 mounted on the output shaft of the percussion generator 6 , and the firing wheel 62 is meshed with the transmission output wheel 61 .

[0074] A method for controlling the firing of a stapler includes the following steps: an initialization step, a stapling step, a firing current limiting step, a full-strength firing step, a current limiting switch cutting step, a firing to the end step, a retraction initial step, a retraction back stage step, and a retraction to the end step. Among them: Initialization steps: See the circuit section 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 Fig.11 and Fig.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. Fig.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. Fig.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. Fig.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. Fig.18 and Fig.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.

[0075] Anastomosis step: pinch the anastomosis handle 83, see Fig.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. Fig.23 , pinching the anastomosis handle 83 will drive the staple cartridge assembly 82 to perform anastomosis (ie, the staple cartridge assembly 82 will close).

[0076] Firing current limiting steps: pinch the firing handle 84, see Fig.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 Fig.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, realizing Figure 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 Fig.18 and Fig.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.

[0077] 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 Fig.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.

[0078] Initial step of retreat: release the firing handle 84, see Fig.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.

[0079] Backward step: firing rack 5 backs up, see Fig.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.

[0080] Step of returning to the bottom: The firing rack 5 continues to return until the Fig.13 From A to B, and Fig.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).

[0081] 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 Fig.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.

[0082] Reset steps: Manually turn the current limit reset dial 43, see Fig. 22 , Fig.23 ,as well as Fig.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.

[0083] 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.

[0084] Furthermore, after the full-strength firing step, the method also includes: a manual retraction step: opening the safety cover 81, switching the fourth switching switch SW0 to conduction between the common end and the normally open end, stopping the firing generator 6, exposing the first limit force portion 641 of the active retraction wheel 64, and connecting the second limit force portion 71 of the wrench 7 to the first limit force portion 641. Manually rotating the wrench 7 drives 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 motor control circuit, characterized in that: It comprises a striking generator (6), 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 end, a first switching end and a second switching end; wherein: A third switching switch (SW3), the common end of which is connected to one end of the striking generator (6), the first switching end of which is connected to one end of the current limiting protection unit, and the second switching end of which is connected to a power supply electrode; A second switch (SW2), the common end of which is connected to another power supply electrode, the first switch end of which is connected to the first switch end of the third switch (SW3), and the second switch end of which is connected to the other end of the current limiting protection unit; The first switching switch (SW1) has a common end connected to the other end of the striking generator (6), a first switching end connected to another power supply electrode, and a second switching end connected to a power supply electrode.

2. The motor control circuit according to claim 1, characterized in that: The current limiting protection unit comprises a current limiting resistor, a thermistor and a current limiting disconnect switch (4) connected in series; The current limiting disconnect switch (4) has a first end and a second end that can be switched on and off, the second end is electrically connected to one end of a current limiting resistor, and one end of a thermistor is electrically connected to the other end of the current limiting resistor; The common end of the third switch (SW3) is connected to one end of the shock generator (6), the first switch end is connected to the other end of the thermistor, and the second switch end is connected to the power supply electrode.

3. The motor control circuit according to claim 1, characterized in that: The switch further comprises a fourth switch (SW0), wherein the first switch end of the first switch (SW1) and the common end of the second switch (SW2) are connected to the second switch end of the fourth switch (SW0), and are connected to the other power supply electrode through the common end of the fourth switch (SW0); The first switching end of the fourth switching switch (SW0) is vacant; The first switching end is a normally open end, and the second switching end is a normally closed end; The one power supply electrode is a negative power supply terminal, and the other power supply electrode is a positive power supply terminal; The common end of the third switching switch (SW3) is connected to the negative terminal of the shock generator (6), and the common end of the first switching switch (SW1) is connected to the positive terminal of the shock generator (6).

4. An electric device driven by a motor, characterized in that: The motor control circuit comprises the motor control circuit as described in any one of claims 1 to 3.

5. A quick-stop stapler, characterized in that: It comprises a main body and a control circuit, wherein the control circuit is a motor control circuit according to any one of claims 1 to 3, and the main body comprises: a firing handle (84), used to trigger the switching of the third switching switch (SW3); and The firing rack (5) is driven forward and backward by the firing generator (6); The switching of the second switching switch (SW2) is triggered when the firing rack (5) moves to a predetermined position; and the switching of the first switching switch (SW1) is triggered when the firing rack (5) moves to a predetermined position.

6. The quick-stop stapler according to claim 5, characterized in that: The subject also includes: A firing rod, driven forward and backward by a firing rack (5); and The staple cartridge assembly (82) is used for stapling and cutting human tissue, and is driven and controlled by a firing rod to perform stapling and cutting actions; When the firing handle (84) is pinched, the third switch (SW3) switches from being connected between the common end and the second switching end to being connected between the common end and the first switching end; when the firing handle (84) is released, the third switch (SW3) switches from being connected between the common end and the first switching end to being connected between the common end and the second switching end.

7. A stapler firing control method, characterized in that: The steps include: Initialization step: the first switch (SW1), the second switch (SW2), the third switch (SW3) and the fourth switch (SW0) are all configured to be conductive between the common terminal and the normally closed terminal; the current limiting disconnect switch (4) is configured to be conductive between the first terminal and the second terminal; 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) to trigger the third switch (SW3) to switch between the common end and the normally open end, powering the current limiting protection unit, causing the firing generator (6) to rotate forward, and driving the firing rack (5) to move forward; Full-strength firing steps: the firing rack (5) is pushed forward, triggering the second switch (SW2) to switch between the common end and the normally open end, the current limiting protection unit is powered off, and the firing generator (6) continues to drive the firing rack (5) forward at full strength; Firing to the end step: After the full-strength firing step, the firing rack (5) continues to be pushed forward until the first switching switch (SW1) is triggered to switch the common end and the normally open end to conduction, and 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.

8. The stapler firing control method according to claim 7, characterized in that: The steps between the full-strike step and the full-strike step also include: Current limiting switch disconnection step: after the full-strength firing step, the firing rack (5) continues to be pushed forward until the front inner wall (511) of the firing rack (5) pushes open the current limiting receiving portion (422) of the current limiting disconnection trigger member (42), so that the current limiting disconnection trigger member (42) is deflected, the current limiting trigger portion (421) and the current limiting disconnection contact (41) are separated, and the first end and the second end of the current limiting disconnection switch (4) are disconnected; After the firing step, the following steps are also included: 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 stapler firing control method according to claim 8, characterized in that: The following steps are included after rolling back to the end: Warning step: executing the anastomosis 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 that the staple cartridge assembly (82) may have been used or the staple cartridge assembly (82) is not installed, and a stall occurs during the current limiting period; Reset step: manually toggle the current limiting reset button (43) to deflect the current limiting disconnect trigger (42) in the reset direction until the current limiting trigger portion (421) contacts the current limiting disconnect contact (41) again, and conduction is restored between the first end and the second end of the current limiting disconnect switch (4).

10. The stapler firing control method according to claim 9, characterized in that: The full-strike step and the initial step of retreat also include: Active retraction step during the firing process: pushing the active stop button (67) to push the second toggle portion (125) of the first switching trigger member (12) to rotate the first switching trigger member (12) until the first trigger portion (121) contacts the first switching contact (11), triggering the first switching switch (SW1) to switch between the common end and the normally open end, forming an equipotential voltage at both ends of the firing generator (6) to block the flow of current, 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 performed, the firing rack (5) continues to be pushed forward until the first switching switch (SW1) is triggered to switch the common end and the normally open end to conduction, 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; Also includes: Manual retraction steps: open the safety cover (81), switch the fourth switch (SW0) to conduction between the common end and the normally open end, stop the firing generator (6), expose the first limit force application part (641) of the active retraction wheel (64), connect the second limit force application part (71) of the wrench (7) to the first limit force application part (641), manually rotate the wrench (7) 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.

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