Control circuit and method for electric endoscope cutting anastomat

Abstract

The control circuit comprises a circuit board body, five small microswitches are arranged on the circuit board body, one end of a switch A is connected with the negative electrode of a power source, and the other end of the switch A and a switch B are connected to the fourth pin and the fifth pin of a relay in series. A pin 3 of the relay, a resistor, a self-recovery fuse and a switch D are connected in series to the positive electrode of the motor; a switch C is connected in parallel between the switch D and the self-recovery fuse, and the switch C and a switch E are connected in series to a pin 6 of the relay; according to the anastomosis cutting device, the continuity of the anastomosis cutting process can be guaranteed, and the anastomosis cutting effect is greatly improved. And moreover, an uncompleted cutting switch E cannot be automatically triggered, so that the surgical risk caused by knife return due to misoperation when anastomosis cutting is not completed is avoided, and the risk of surgical accidents caused by secondary loading and use of the used disposable nail bin is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of laparoscopic cutting stapler control, and specifically relates to a control circuit and method for an electric laparoscopic cutting stapler. Background Art

[0002] Laparoscopic cutting staplers are used in minimally invasive or open surgical procedures for the transection, resection, and / or establishment of anastomoses of internal organs and tissues. In recent years, with the popularization of minimally invasive surgery, laparoscopic cutting staplers have been used more and more widely. Currently, commonly used laparoscopic cutting staplers are divided into manual laparoscopic cutting staplers and electric laparoscopic cutting staplers. The cutting and anastomosis of tissues and the back-knife operation after the cutting and anastomosis are completed in manual laparoscopic cutting staplers are all manually controlled. Most electric laparoscopic cutting staplers cannot fully automate the above actions and also require manual back-knife operation, which will cause the anastomosis and cutting process to be discontinuous, affecting the anastomosis and cutting effect, or it is easy to perform a back-knife operation by mistake before the anastomosis and cutting are completed, resulting in surgical risks. Summary of the Invention

[0003] The purpose of the present invention is to provide a control circuit and method for an electric laparoscopic cutting stapler, which can realize the electrification of the anastomosis and cutting process and the back-knife operation during the operation, and at the same time, there will be no misoperation of the back-knife before the anastomosis and cutting are completed, so as to solve the deficiencies of the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A control circuit for an electric laparoscopic cutting stapler includes a circuit board body. Five small microswitches are provided on the circuit board body, namely switch A, switch B, switch C, switch D, and switch E; resistors, a self-resetting fuse, and a relay are also arranged on the circuit board body; one end of switch A is connected to the negative pole of the power supply, and the other end is connected in series with switch B to the 4th and 5th pins of the relay. The 3rd pin of the relay is connected in series with the resistor, the self-resetting fuse, and switch D to the positive pole of the motor; switch C is connected in parallel between switch D and the self-resetting fuse, and switch C and switch E are connected in series to the 6th pin of the relay; the negative pole of the motor is connected to the 6th pin of the relay, and the positive pole of the power supply is connected to the 10th pin of the relay.

[0006] Further, the COM pins of the five small microswitches are common terminals, the NC pins are normally closed terminals, and the NO pins are normally open terminals. When the switch trigger button is not pressed, the COM terminal is disconnected from the NO terminal and conducts with the NC terminal. When the switch trigger button is pressed, the COM terminal is disconnected from the NC terminal and conducts with the NO terminal.

[0007] Further, in the relay, when power is applied to pins 1 and 5, pins 3 and 4 of the relay are connected, pins 7 and 8 are connected, pins 2 and 3 are disconnected, and pins 8 and 9 are disconnected. After power-off, this state is maintained. When power is applied to pins 6 and 10, the state of the relay changes, pins 2 and 3 are connected, pins 8 and 9 are connected, pins 3 and 4 are disconnected, and pins 7 and 8 are disconnected.

[0008] Further, a battery pack mounting position and a motor connection wire are provided on the circuit board body.

[0009] A control method for a control circuit of an electric endoscopic cutting stapler includes the following steps:

[0010] S1: Before using the instrument, load the DC power supply. Switch A is turned on between the COM and NO terminals, and switches B, C, D, and E are turned on between the COM and NC terminals. Power is applied to pins 1 and 5 of the relay, and pins 3 and 4 of the relay are turned on.

[0011] S2: After the instrument clamps the tissue and before performing the anastomosis and cutting operation, switch B changes its state. At this time, switches A and B are turned on between the COM and NO terminals, and switches C, D, and E are turned on between the COM and NC terminals. Power is removed from pins 1 and 5 of the relay, and the relay continues to keep pins 3 and 4 turned on.

[0012] S3: When the instrument starts the anastomosis and cutting operation, switch D changes its state. At this time, switches A, B, and D are turned on between the COM and NO terminals, and switches C and E are turned on between the COM and NC terminals; the positive pole of the power supply is conducted to the negative pole of the motor through switch E, and the negative pole of the power supply is conducted to the positive pole of the motor through switches A, B, pins 3 and 4 of the relay, the resistor, the self-resetting fuse, and switch D. The motor starts to rotate and drives the cutting knife forward through the transmission system to start the anastomosis and cutting operation.

[0013] S4: After the instrument starts the anastomosis and cutting, switch C changes its state. At this time, switches A, B, C, and D are turned on between the COM and NO terminals, and switch E is turned on between the COM and NC terminals. Pins 3 and 4 of the relay, the resistor, and the self-resetting fuse are all short-circuited. At this time, the positive pole of the power supply is conducted to the negative pole of the motor through switch E, and the negative pole of the power supply is directly conducted to the positive pole of the motor through switches A, B, C, and D. The motor current increases, and both the motor torque and speed increase. The cutting knife is driven forward through the transmission system to perform a fast anastomosis and cutting operation.

[0014] S5: When the instrument's anastomosis and cutting are completed, switch E changes its state. At this time, switches A, B, C, D, and E are conducting between the COM and NO terminals. At this moment, the positive pole of the power supply is disconnected from the negative pole of the motor, the instrument stops working, the 10th pin of the relay is conducting with the positive pole of the power supply, and the 6th pin is conducting with the negative pole of the power supply through switches A, B, and E. The 6th and 10th pins of the relay are powered, the state of the relay changes, and the 3rd and 4th pins are disconnected;

[0015] S6: After the instrument's anastomosis and cutting are completed and the instrument stops working, change the state of switch D so that switches A, B, C, and E are conducting between the COM and NO terminals, and switch D is conducting between the COM and NC terminals. The positive pole of the power supply is conducting with the positive pole of the motor through switch D, and the negative pole of the power supply is conducting with the negative pole of the motor through switches A, B, and E. The motor starts to rotate in reverse, and drives the cutting knife to move backward through the transmission system to start the knife-return operation;

[0016] S7: When the cutting knife returns to the initial position before anastomosis and cutting, the states of switches C and E change. At this time, switches A and B are conducting between the COM and NO terminals, and switches C, D, and E are conducting between the COM and NC terminals. The 6th and 10th pins of the relay are powered off, and the relay continues to maintain the state where the 3rd and 4th pins are disconnected. At this time, the clamped tissue is withdrawn from the instrument, change the state of switch B so that switch A is conducting between the COM and NO terminals, and switches B, C, D, and E are conducting between the COM and NC terminals. The 1st and 5th pins of the relay are powered again, the state of the relay changes again, and the 3rd and 4th pins are conducting, and the instrument returns to the state of loading the DC power supply before use.

[0017] An electric laparoscopic cutting stapler, comprising a control circuit for an electric laparoscopic cutting stapler, and further comprising a cartridge seat and a handheld part. A disposable cartridge is installed in the cartridge seat, and the disposable cartridge is fixed in the cartridge seat through an anvil; the handheld part includes a manual knife-return button, a circuit board body, a manual knife-return device cover plate, a battery pack, a reset button, a motor, a closing handle, and a firing button; the battery pack is connected to the battery pack insertion position on the circuit board body; the motor connection wire on the circuit board body is connected to the motor.

[0018] A control method for an electric laparoscopic cutting stapler, comprising the following steps:

[0019] S1: When the electric laparoscopic cutting stapler leaves the factory, the manual knife-return device cover plate is already installed. Ensure that the switch A button is in the trigger position where the COM and NO terminals are conducting. When in use, first load the disposable cartridge into the cartridge seat, insert the battery pack into the battery pack insertion position to supply power to the device. At this time, the instrument is in the state before use;

[0020] S2: Place the tissue to be cut between the disposable staple cartridge and the anvil. Close the closing handle towards the motor until the locked position. The reset button is linked, triggering the switch B button to keep the COM terminal and the NO terminal conducting. The anvil closes towards the disposable staple cartridge to complete the clamping of the tissue. At this time, after the instrument clamps the tissue and before performing the anastomosis and cutting operation;

[0021] S3: Continuously press the firing button to trigger the switch D button and keep the COM terminal and the NO terminal conducting. The motor 27 starts to rotate and drives the cutting knife forward through the transmission system to start the anastomosis and cutting operation. At this time, the instrument is in the state of starting the anastomosis and cutting operation;

[0022] S4: After the instrument starts the anastomosis and cutting, the transmission system triggers the switch C and keeps the COM terminal and the NO terminal conducting. The motor torque and speed both increase, and the cutting knife is driven by the transmission system to perform a rapid anastomosis and cutting operation. At this time, the instrument is in the state after starting the anastomosis and cutting;

[0023] S5: After the instrument completes the anastomosis and cutting, the transmission system triggers the switch E and keeps the COM terminal and the NO terminal conducting. The instrument stops working. At this time, the instrument is in the state when the anastomosis and cutting are completed;

[0024] S6: Release the firing button. The switch D changes to the untriggered state where the COM terminal and the NC terminal are conducting. The motor starts to rotate in the reverse direction and drives the cutting knife to move backward to start the retraction operation. At this time, after the anastomosis and cutting are completed and the instrument stops working;

[0025] S7: When the cutting knife returns to the initial position before the anastomosis and cutting, the transmission system touches the switch C and the switch E, and both change to the untriggered state where the COM terminal and the NC terminal are conducting. At this time, even if the firing button is pressed, the instrument will not perform the anastomosis and cutting operation. At this time, the instrument is in the state when the cutting knife returns to the initial position before the anastomosis and cutting;

[0026] S8: Press the reset button to release the closing handle. The anvil at the front end of the instrument and the disposable staple cartridge open to release the clamped tissue that has completed the anastomosis and cutting. After pressing the reset button, the state of the trigger switch B changes to the untriggered state. The instrument returns to the state before use. After replacing the disposable staple cartridge, the secondary anastomosis and cutting operation can be performed.

[0027] Further, in actual use, when the disposable staple cartridge replaced by misoperation is a used one, when the instrument starts the anastomosis and cutting operation, the cutting knife will be stuck due to the mechanical structure when moving forward, the current in the circuit will be overloaded, and the self - resetting fuse will cut off the circuit. At this time, release the firing button to change the state of switch D to the untriggered state, and change the state of switch E to the triggered state by pushing the manual knife - retracting button forward. The motor starts to reverse, drives the cutting knife to move backward to the initial position before anastomosis and cutting through the transmission system, and then operate according to the operations in S7 - S8 to return the instrument to the state before use.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] The control circuit and method for the electric endoscopic cutting stapler of the present invention can realize the electrification of the anastomosis and cutting process and the knife - retracting operation during the operation, ensure the continuity of the anastomosis and cutting process, and greatly improve the effect of anastomosis and cutting. Moreover, switch E will not be automatically triggered when the cutting is not completed, avoiding the risk of misoperation to retract the knife before the anastomosis and cutting are completed, which may cause surgical risks, and avoiding the risk of re - loading and using a used disposable staple cartridge, which may cause surgical accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a perspective view of the underside structure of the circuit board body of the present invention;

[0031] Figure 2 It is a perspective view of the top - side structure of the circuit board body of the present invention;

[0032] Figure 3 It is a connection diagram of the control circuit of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the electric endoscopic cutting stapler of the present invention.

[0034] In the figure: 9. Switch D; 10. Switch C; 11. Switch E; 12. Switch B; 13. Battery pack insertion position; 14. Resistor; 15. Self - resetting fuse; 16. Switch A; 17. Relay; 18. Motor connection wire; 19. Disposable staple cartridge; 20. Anvil; 21. Staple cartridge seat; 22. Manual knife - retracting button; 23. Circuit board body; 24. Cover plate of the manual knife - retracting device; 25. Battery pack; 26. Reset button; 27. Motor; 28. Closing handle; 29. Firing button. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In view of the problems existing in current manual and electric endoscopic cutting staplers, an embodiment of the present invention designs a control circuit for an electric endoscopic cutting stapler, as Figures 1-3 shown: It includes a circuit board body 23, on which five small microswitches are provided, namely switch A16, switch B12, switch C10, switch D9, and switch E11. Among them, the COM pins of the five small microswitches are common terminals, the NC pins are normally closed terminals, and the NO pins are normally open terminals. When the switch trigger button is not pressed, the COM terminal is disconnected from the NO terminal and conducts with the NC terminal. When the switch trigger button is pressed, the COM terminal is disconnected from the NC terminal and conducts with the NO terminal; a resistor 14, a self-resetting fuse 15, and a relay 17 are also arranged on the circuit board body 23; one end of switch A16 is connected to the negative pole of the power supply, and the other end is connected in series with switch B12 to the 4th and 5th pins of the relay 17. The 3rd pin of the relay 17 is connected in series with the resistor 14, the self-resetting fuse 15, and switch D9 to the positive pole of the motor; switch C10 is connected in parallel between switch D9 and the self-resetting fuse 15, and switch C10 and switch E11 are connected in series to the 6th pin of the relay 17; the negative pole of the motor is connected to the 6th pin of the relay 17, and the positive pole of the power supply is connected to the 10th pin of the relay 17. In the relay 17, when power is applied to pins 1 and 5, the 3rd and 4th pins of the relay 17 are connected, the 7th and 8th pins are connected, the 2nd and 3rd pins are disconnected, and the 8th and 9th pins are disconnected. After power-off, this state is maintained. When power is applied to pins 6 and 10, the state of the relay 17 changes, the 2nd and 3rd pins are connected, the 8th and 9th pins are connected, the 3rd and 4th pins are disconnected, and the 7th and 8th pins are disconnected.

[0037] In the above embodiment, the anastomosis and cutting operation of the electric endoscopic cutting stapler is completed by the rotation of a DC motor driving the cutting knife forward through a transmission system, and the back-knife operation is completed by the reverse rotation of the DC motor driving the cutting knife backward through the transmission system. The power supply uses a DC power supply. Based on this, the specific control method of the control circuit in the embodiment of the present invention is as follows:

[0038] S1: Before using the instrument, load the DC power supply. Switch A16 is in a conducting state between the COM and NO terminals, switches B12, C10, D9, and E11 are in a conducting state between the COM and NC terminals, power is applied to pins 1 and 5 of the relay 17, and the 3rd and 4th pins of the relay 17 are conducting.

[0039] S2: After the instrument clamps the tissue and before performing the anastomosis cutting operation, the state of switch B12 changes. At this time, switches A16 and B12 are conducting between COM and NO, switches C10, D9, and E11 are conducting between COM and NC, pins 1 and 5 of relay 17 are de-energized, and relay 17 continues to keep pins 3 and 4 conducting;

[0040] S3: When the instrument starts the anastomosis cutting operation, the state of switch D9 changes. At this time, switches A16, B12, and D9 are conducting between COM and NO, switches C10 and E11 are conducting between COM and NC; the positive pole of the power supply is conducting with the negative pole of the motor through switch E11, and the negative pole of the power supply is conducting with the positive pole of the motor through switches A16, B12, pin 3 and 4 of relay 17, resistor 14, self-resetting fuse 15, and switch D9. The motor starts to rotate and drives the cutting knife forward through the transmission system to start the anastomosis cutting operation;

[0041] S4: After the instrument starts the anastomosis cutting, the state of switch C10 changes. At this time, switches A16, B12, C10, and D9 are conducting between COM and NO, switch E11 is conducting between COM and NC, and pin 3 and 4 of relay 17, resistor 14, and self-resetting fuse 15 are all short-circuited. At this time, the positive pole of the power supply is conducting with the negative pole of the motor through switch E11, and the negative pole of the power supply is directly conducting with the positive pole of the motor through switches A16, B12, C10, and D9. The current of the motor increases, and both the torque and speed of the motor increase. The cutting knife is driven forward through the transmission system to perform a fast anastomosis cutting operation;

[0042] S5: When the anastomosis cutting of the instrument is completed, the state of switch E11 changes. At this time, switches A16, B12, C10, D9, and E11 are conducting between COM and NO. At this time, the positive pole of the power supply is disconnected from the negative pole of the motor, and the instrument stops working. Pin 10 of relay 17 is conducting with the positive pole of the power supply, and pin 6 is conducting with the negative pole of the power supply through switches A16, B12, and E11. Pins 6 and 10 of relay 17 are energized, and the state of relay 17 changes, and pins 3 and 4 are disconnected;

[0043] S6: After the anastomosis cutting of the instrument is completed and the instrument stops working, change the state of switch D9 to make switches A16, B12, C10, and E11 conduct between COM and NO, and switch D9 conduct between COM and NC. The positive pole of the power supply is conducting with the positive pole of the motor through switch D9, and the negative pole of the power supply is conducting with the negative pole of the motor through switches A16, B12, and E11. The motor starts to reverse and drives the cutting knife backward through the transmission system to start the back-knife operation;

[0044] S7: When the cutting knife returns to the initial position before anastomosis cutting, the states of switch C10 and switch E11 change. At this time, switches A16 and B12 are conducting between COM and NO terminals, and switches C10, D9, and E11 are conducting between COM and NC terminals. The 6th and 10th pins of relay 17 are de-energized, and relay 17 continues to maintain the open state of its 3rd and 4th pins. Although the state of the instrument switch is the same as that before the instrument holds the tissue and performs anastomosis cutting operation at this time, due to the different states of the relay, even if the state of switch D9 is changed, the instrument will not work. This can avoid performing secondary anastomosis cutting on the used instrument (the disposable staple cartridge used in conjunction with the instrument), thus causing surgical risks. At this time, the held tissue is withdrawn from the instrument, the state of switch B12 is changed, so that switch A16 is conducting between COM and NO terminals, and switches B12, C10, D9, and E11 are conducting between COM and NC terminals. The 1st and 5th pins of relay 17 are re-energized, the state of relay 17 changes again, and its 3rd and 4th pins are conducting, and the instrument returns to the state of loading the DC power supply before use.

[0045] In actual use, when replacing the disposable staple cartridge 19 used in conjunction with the instrument, there may be a misoperation that the replaced staple cartridge has actually been used. When the instrument starts the anastomosis cutting operation, when the cutting knife moves forward, it will be stuck due to the mechanical structure, and the current in the circuit will be overloaded. The self-resetting fuse 15 will cut off the circuit, which can avoid unacceptable surgical risks caused by misoperation. At this time, the operation can only be stopped, and the states of switches D9 and E11 are changed, so that switches A16, B12, and E11 are conducting between COM and NO terminals, and switches C10 and D9 are conducting between COM and NC terminals. The positive pole of the power supply is conducted to the positive pole of the motor through switch D9, and the negative pole of the power supply is conducted to the negative pole of the motor through switches A16, B12, and E11. The motor starts to rotate in reverse, and drives the cutting knife to move backward to the initial position before anastomosis cutting through the transmission system. Then the instrument returns to the state of loading the DC power supply before use according to the operation in S7.

[0046] To further better explain the present invention, this embodiment also provides an electric laparoscopic cutting stapler, as Figure 4 shown, which includes a control circuit for an electric laparoscopic cutting stapler, and also includes a staple cartridge seat 21 and a handheld part. The staple cartridge seat 21 is used to install the disposable staple cartridge 19, and the disposable staple cartridge 19 is fixed in the staple cartridge seat 21 through the anvil 20; the handheld part includes a manual retraction button 22, a circuit board body 23, a manual retraction device cover plate 24, a battery pack 25, a reset button 26, a motor 27, a closing handle 28, and a firing button 29; a battery pack insertion position 13 and a motor connection wire 18 are provided on the circuit board body 23, and the battery pack 25 is connected to the battery pack insertion position 13 on the circuit board body 23; the motor connection wire 18 on the circuit board body 23 is connected to the motor 27.

[0047] The control method of the electric laparoscopic cutting stapler in this embodiment is as follows:

[0048] S1: When the electric laparoscopic cutting stapler leaves the factory, the cover plate 24 of the manual knife return device is already installed. After the installation of the cover plate 24 of the manual knife return device, it can ensure that the switch A16 button is in the trigger position where the COM terminal and the NO terminal are conducting. During use, first load the disposable staple cartridge 19 into the staple cartridge seat 21, and insert the battery pack 25 into the battery pack insertion position 13 to supply power to the device. At this time, the instrument is in the state before use;

[0049] S2: Place the tissue to be cut between the disposable staple cartridge 19 and the anvil 20, close the closing handle 28 towards the motor 27 until the locked position. The reset button 26 is linked, triggering the switch B12 button to keep the COM terminal and the NO terminal conducting. The anvil 20 closes towards the disposable staple cartridge 19 to complete the clamping of the tissue. At this time, the instrument is in the state after clamping the tissue and before performing the anastomosis cutting operation;

[0050] S3: Continuously press the firing button 29, trigger the switch D9 button and keep the COM terminal and the NO terminal conducting. The motor 27 starts to rotate and drives the cutting knife forward through the transmission system to start the anastomosis cutting operation. At this time, the instrument is in the state of starting the anastomosis cutting operation;

[0051] S4: After the instrument starts the anastomosis cutting, the transmission system triggers the switch C10 and keeps the COM terminal and the NO terminal conducting. The torque and speed of the motor 27 both increase, and the cutting knife is driven by the transmission system to perform a fast anastomosis cutting operation. At this time, the instrument is in the state after starting the anastomosis cutting;

[0052] S5: After the instrument completes the anastomosis cutting, the transmission system triggers the switch E11 and keeps the COM terminal and the NO terminal conducting. The instrument stops working. At this time, the instrument is in the state when the anastomosis cutting is completed;

[0053] S6: Release the firing button 29, and the switch D9 changes to the untriggered state where the COM terminal and the NC terminal are conducting. The motor 27 starts to rotate in the reverse direction, and the cutting knife is driven by the transmission system to move backward to start the knife return operation. At this time, the instrument is in the state after the anastomosis cutting is completed and the instrument stops working;

[0054] S7: When the cutting knife returns to the initial position before the anastomosis cutting, the transmission system touches the switch C10 and the switch E11, and both change to the untriggered state where the COM terminal and the NC terminal are conducting. At this time, even if the firing button 29 is pressed, the instrument will not perform the anastomosis cutting operation. At this time, the instrument is in the state when the cutting knife returns to the initial position before the anastomosis cutting;

[0055] S8: Press the reset button 26 to release the closing handle 28. The anvil 20 at the front end of the instrument and the disposable staple cartridge 19 open to release the tissue that has been anastomosed and cut and is held in the middle. After pressing the reset button 26, the state of the touch switch B12 changes to the non-triggered state, and the instrument returns to the state before use. After replacing the disposable staple cartridge 19, a second anastomosis and cutting operation can be performed.

[0056] In actual use of the electric laparoscopic cutting stapler in this embodiment, when the accidentally replaced disposable staple cartridge 19 is a used staple cartridge, when the instrument starts the anastomosis and cutting operation, the cutting knife will be jammed due to the mechanical structure when moving forward, and the current in the circuit will be overloaded. The self-resetting fuse 15 cuts off the circuit. At this time, release the firing button 29 to change the state of the switch D9 to the non-triggered state. Push the manual back-knife button 22 forward to touch the switch E11 to change to the triggered state, and the motor 27 starts to reverse. Drive the cutting knife to move backward to the initial position before anastomosis and cutting through the transmission system, and then operate according to S7-S8 to make the instrument return to the state before use.

[0057] In summary: The control circuit and method for an electric laparoscopic cutting stapler provided by the embodiment of the present invention can realize the electrification of the anastomosis and cutting process and the back-knife operation during the operation, ensure the continuity of the anastomosis and cutting process, and greatly improve the effect of anastomosis and cutting. The cutting incomplete switch E11 will not be automatically triggered, avoiding the risk of accidentally operating the back-knife when the anastomosis and cutting are not completed, and avoiding the risk of surgical accidents caused by the reuse of used disposable staple cartridges.

[0058] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A control circuit for an electric endoscopic cutting stapler, comprising a circuit board body (23), characterized in that, There are five small micro switches on the circuit board body (23), namely switch A (16), switch B (12), switch C (10), switch D (9), and switch E (11); a resistor (14), a self - reset fuse (15), and a relay (17) are also arranged on the circuit board body (23); one end of the switch A (16) is connected to the negative pole of the power supply, and the other end is connected in series with the switch B (12) to the 4th and 5th pins of the relay (17). The 3rd pin of the relay (17) is connected in series with the resistor (14), the self - reset fuse (15), and the switch D (9) to the positive pole of the motor; the switch C (10) is connected in parallel between the switch D (9) and the self - reset fuse (15), and the switch C (10) and the switch E (11) are connected in series to the 6th pin of the relay (17); the negative pole of the motor is connected to the 6th pin of the relay (17), and the positive pole of the power supply is connected to the 10th pin of the relay (17).

2. The control circuit for an electric endoscopic cutting stapler according to claim 1, wherein: The COM pins of the five small micro switches are common terminals, the NC pins are normally - closed terminals, and the NO pins are normally - open terminals. When the switch trigger button is not pressed, the COM terminal is disconnected from the NO terminal and conducts with the NC terminal. When the switch trigger button is pressed, the COM terminal is disconnected from the NC terminal and conducts with the NO terminal.

3. The control circuit for an electric laparoscopic cutting stapler according to claim 1, characterized in that: In the relay (17), when power is applied to pins 1 and 5, pins 3 and 4 of the relay (17) are connected, pins 7 and 8 are connected, pins 2 and 3 are disconnected, and pins 8 and 9 are disconnected. After power - off, this state is maintained. When power is applied to pins 6 and 10, the state of the relay (17) changes, pins 2 and 3 are connected, pins 8 and 9 are connected, pins 3 and 4 are disconnected, and pins 7 and 8 are disconnected.

4. The control circuit for an electric laparoscopic cutting stapler according to claim 1, wherein: A battery pack insertion position (13) and a motor connecting wire (18) are provided on the circuit board body (23).

5. A control method for the control circuit of an electric endoscopic cutting stapler according to claim 1, characterized in that: It includes the following steps: S1: Before using the instrument, load the DC power supply. The switch A (16) is in a state where the COM and NO terminals are conducting, the switches B (12), C (10), D (9), and E (11) are in a state where the COM and NC terminals are conducting, power is applied to pins 1 and 5 of the relay (17), and pins 3 and 4 of the relay (17) are conducting. S2: After the instrument clamps the tissue and before performing the anastomosis cutting operation, the state of the switch B (12) changes. At this time, the switches A (16) and B (12) are in a state where the COM and NO terminals are conducting, the switches C (10), D (9), and E (11) are in a state where the COM and NC terminals are conducting, power is removed from pins 1 and 5 of the relay (17), and the relay (17) continues to maintain the conduction of pins 3 and 4. S3: The instrument starts the anastomosis and cutting operation, and switch D(9) changes its state. At this time, switches A(16), B(12), and D(9) are conducting between the COM and NO terminals, and switches C(10) and E(11) are conducting between the COM and NC terminals; the positive pole of the power supply is conducting with the negative pole of the motor through switch E(11), and the negative pole of the power supply is conducting with the positive pole of the motor through switches A(16), B(12), the 3rd and 4th pins of relay(17), resistor(14), self - reset fuse(15), and switch D(9). The motor starts to rotate and drives the cutting knife forward through the transmission system to start the anastomosis and cutting operation; S4: After the instrument starts the anastomosis and cutting, switch C(10) changes its state. At this time, switches A(16), B(12), C(10), and D(9) are conducting between the COM and NO terminals, and switch E(11) is conducting between the COM and NC terminals. The 3rd and 4th pins of relay(17), resistor(14), and self - reset fuse(15) are all short - circuited. At this time, the positive pole of the power supply is conducting with the negative pole of the motor through switch E(11), and the negative pole of the power supply is directly conducting with the positive pole of the motor through switches A(16), B(12), C(10), and D(9). The current of the motor increases, and both the torque and speed of the motor increase. The cutting knife is driven forward through the transmission system to perform a fast anastomosis and cutting operation; S5: When the anastomosis and cutting of the instrument are completed, switch E(11) changes its state. At this time, switches A(16), B(12), C(10), D(9), and E(11) are conducting between the COM and NO terminals. At this time, the positive pole of the power supply is disconnected from the negative pole of the motor, and the instrument stops working. The 10th pin of relay(17) is conducting with the positive pole of the power supply, and the 6th pin is conducting with the negative pole of the power supply through switches A(16), B(12), and E(11). The 6th and 10th pins of relay(17) are powered on, and the state of relay(17) changes, and the 3rd and 4th pins are disconnected; S6: After the anastomosis and cutting of the instrument are completed and the instrument stops working, change the state of switch D(9) to make switches A(16), B(12), C(10), and E(11) conduct between the COM and NO terminals, and switch D(9) conduct between the COM and NC terminals. The positive pole of the power supply is conducting with the positive pole of the motor through switch D(9), and the negative pole of the power supply is conducting with the negative pole of the motor through switches A(16), B(12), and E(11). The motor starts to reverse and drives the cutting knife backward through the transmission system to start the knife - retracting operation; S7: When the cutting knife returns to the initial position before anastomotic cutting, the states of switch C (10) and switch E (11) change. At this time, switch A (16) and switch B (12) are in a conducting state between the COM and NO terminals. Switch C (10), switch D (9), and switch E (11) are in a conducting state between the COM and NC terminals. The 6th and 10th pins of the relay (17) are de-energized, and the relay (17) continues to maintain the open state of the 3rd and 4th pins. At this time, the clamped tissue is withdrawn from the instrument. Change the state of switch B (12) to make switch A (16) in a conducting state between the COM and NO terminals. Switch B (12), switch C (10), switch D (9), and switch E (11) are in a conducting state between the COM and NC terminals. The 1st and 5th pins of the relay (17) are re-energized, and the state of the relay (17) changes again, and the 3rd and 4th pins are conducting. The instrument returns to the state of loading the DC power supply before use.

6. An electric laparoscopic cutting stapler, comprising a control circuit for an electric laparoscopic cutting stapler as described in claim 1, characterized in that: It also includes a cartridge seat (21) and a handheld part. The cartridge seat (21) is used to install a disposable cartridge (19), and the disposable cartridge (19) is fixed in the cartridge seat (21) through an anvil (20); the handheld part includes a manual retraction button (22), a circuit board body (23), a manual retraction device cover plate (24), a battery pack (25), a reset button (26), a motor (27), a closing handle (28), and a firing button (29); the battery pack (25) is connected to the battery pack insertion position (13) on the circuit board body (23); the motor connection wire (18) on the circuit board body (23) is connected to the motor (27).

7. A control method for an electric laparoscopic cutting stapler as described in claim 6, characterized in that: It includes the following steps: S1: When the electric laparoscopic cutting stapler leaves the factory, the manual retraction device cover plate (24) is already installed. Ensure that the switch A (16) button is in the triggering position where the COM terminal and the NO terminal are conducting. When in use, first load the disposable cartridge (19) into the cartridge seat (21), and insert the battery pack (25) into the battery pack insertion position (13) to supply power to the device. At this time, the instrument is in the state before use; S2: Place the tissue to be cut between the disposable cartridge (19) and the anvil (20), close the closing handle (28) towards the motor (27) until the locked position. The reset button (26) is linked, triggering the switch B (12) button to maintain the conducting state between the COM terminal and the NO terminal. The anvil (20) closes towards the disposable cartridge (19) to complete the clamping of the tissue. At this time, the instrument is in the state after clamping the tissue and before performing the anastomotic cutting operation; S3: Continuously press the firing button (29) to trigger the switch D (9) button and maintain the conducting state between the COM terminal and the NO terminal. The motor (27) starts to rotate and drives the cutting knife to move forward through the transmission system to start the anastomotic cutting operation. At this time, the instrument is in the state of starting the anastomotic cutting operation; S4: After the instrument starts the anastomotic cutting, the transmission system triggers the switch C (10) and maintains the conducting state between the COM terminal and the NO terminal. The torque and speed of the motor (27) increase, and the cutting knife is driven by the transmission system to perform a rapid anastomotic cutting operation. At this time, the instrument is in the state after starting the anastomotic cutting; S5: After the instrument completes anastomosis and cutting, the drive system triggers switch E(11) and keeps the COM terminal and the NO terminal conducting. The instrument stops working, and at this time, the instrument is in the state when anastomosis and cutting are completed. S6: Release the firing button (29), switch D(9) changes to the untriggered state where the COM terminal and the NC terminal are conducting, the motor (27) starts to rotate in the reverse direction, drives the cutting knife to move backward through the drive system to start the knife retraction operation. At this time, the instrument is in the state after anastomosis and cutting are completed and the instrument stops working. S7: When the cutting knife returns to the initial position before anastomosis and cutting, the drive system touches switch C(10) and switch E(11), and both change to the untriggered state where the COM terminal and the NC terminal are conducting. At this time, even if the firing button (29) is pressed, the instrument will not perform anastomosis and cutting operations. At this time, the instrument is in the state when the cutting knife returns to the initial position before anastomosis and cutting. S8: Press the reset button (26), release the closing handle (28), the anvil (20) at the front end of the instrument and the disposable staple cartridge (19) open to release the tissue that has completed anastomosis and cutting clamped in the middle. After pressing the reset button (26), the state of switch B(12) is changed to the untriggered state, and the instrument returns to the state before use. After replacing the disposable staple cartridge (19), the secondary anastomosis and cutting operation can be performed.

8. The control method of an electric endoscopic cutting stapler according to claim 7, wherein: In actual use, when the replaced disposable staple cartridge (19) is a used cartridge by mistake, when the instrument starts the anastomosis and cutting operation, the cutting knife will be stuck due to the mechanical structure when moving forward, the current in the circuit will be overloaded, and the self-resetting fuse (15) cuts off the circuit. At this time, release the firing button (29), change the state of switch D(9) to the untriggered state, touch switch E(11) by pushing the manual knife retraction button (22) forward to change it to the triggered state, the motor (27) starts to rotate in the reverse direction, drives the cutting knife to move backward to the initial position before anastomosis and cutting through the drive system, and then operate according to S7 - S8 to make the instrument return to the state before use.

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