Electric anastomat driving circuit and control method thereof

Abstract

The invention provides an electric anastomat driving circuit and a control method thereof.The circuit comprises a switch control module, a percussion control module, a voltage dividing module and a self-locking module, the voltage of a battery acts on a motor through the switch control module, so that the electric anastomat conducts knife returning operation after percussion; when the voltage of the battery acts on the motor, the percussion condition of the electric anastomat is controlled according to a switch tube in the percussion control module and is not influenced by external force; the voltage dividing module is used for dividing the voltage of the output end of the percussion control module, so that the driving impact of the battery on the motor is reduced; when the knife is returned, the state of a switch tube in the percussion control module is switched from a conduction state to a cut-off state through the self-locking module, so that the integrated design of the battery and the electric kiss gun is realized, no extra current is consumed when the battery is inserted, the size of the electric anastomat is reduced, and the operation process is simple.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuit design, and in particular to an electric stapler driving circuit and a control method thereof. Background Art

[0002] Laparoscopic staplers (laparoscopic cutting staplers and disposable stapler magazines) are one of the important instruments for laparoscopic surgery. They replace traditional manual suturing and use titanium staples to separate or staple tissues. They are easy and quick to operate, greatly shortening the operation time. Laparoscopic staplers make it easy and accurate to suture deep areas with narrow fields of view, which are difficult to do manually, and significantly reduce the incidence of anastomotic fistulas. Depending on the power transmission method, staplers can be divided into manual and electric. Electric staplers use electric motors to drive the anastomosis, and their main function is to achieve automatic anastomosis or release of the anastomosis.

[0003] In the related art, after the battery is connected to the electric stapler gun body, there is always current consumption when the jaws are opened, which will consume the power in the battery. Therefore, the battery is generally inserted when in use, but the operation process is increased; the firing state of the electric stapler is reflected by the magnetic force of the permanent magnet relay. Under the action of shaking or some external force, the mechanical contacts of the permanent magnet are prone to reverse, and the electric stapler in the standby state cannot work normally, and the jaws need to be reopened and reset to work normally; and because of the permanent magnet relay, the traditional electric stapler is large in size and high in production cost.

[0004] Therefore, how to provide an electric stapler driving circuit that is not affected by external forces and is energy-saving is a technical problem that urgently needs to be solved. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an electric stapler driving circuit and a control method thereof to solve at least one of the above-mentioned technical problems.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by this application is as follows.

[0007] According to one aspect of an embodiment of the present application, there is provided an electric stapler driving circuit, comprising:

[0008] A switch control module is connected to the battery and the motor, and the switch control module applies the output voltage of the battery to the motor so that the electric stapler performs a knife-retracting operation after firing;

[0009] A firing control module, connected to the switch control module, controls the firing of the electric stapler according to the working state of the switch tube;

[0010] A voltage dividing module, connected to the firing control module, dividing the voltage at the output end of the firing control module;

[0011] The self-locking module is connected to the motor, the switch control module, and the firing control module. During the back-knife operation, based on the driving voltage sent by the switch control module, the switching tube of the firing control module is switched from the conducting state to the cut-off state.

[0012] In an embodiment of the present invention, the switching tube in the firing control module is a PMOS tube or an NMOS tube. When the switching tube is a PMOS tube, the self-locking module includes an optocoupler; when the switching tube is an NMOS tube, the self-locking module includes a transistor.

[0013] In an embodiment of the present invention, the firing control module includes a first resistor, a first capacitor, and a switching tube. One end of the first resistor is connected to the first end of the switching tube, the other end of the first resistor is connected to the control end of the switching tube, and the first capacitor is connected in parallel with the first resistor. Among them, the first end of the switching tube is the input end of the firing control module, the second end of the switching tube is the output end of the firing control module, and the control end of the switching tube is the control end of the firing control module.

[0014] In an embodiment of the present invention, the voltage dividing module includes a second resistor, a third resistor, a fourth resistor, a first NPN transistor, and a voltage stabilizing chip. One end of the second resistor is connected to the collector of the first NPN transistor, the other end of the second resistor is connected to the base of the first NPN transistor, the base of the first NPN transistor is also connected to the cathode of the voltage stabilizing chip, the anode of the voltage stabilizing chip is connected to one end of the third resistor, the other end of the third resistor is connected to the emitter of the first NPN transistor, the other end of the third resistor is also connected to the control end of the voltage stabilizing chip, one end of the fourth resistor is connected to the anode of the voltage stabilizing chip, and the other end of the fourth resistor is connected to the control end of the voltage stabilizing chip. Among them, the collector of the first NPN transistor is the input end of the voltage dividing module, and one end of the third resistor is the output end of the voltage dividing module.

[0015] In an embodiment of the present invention, the switch control module includes a first selector switch, a second selector switch, a third selector switch, a fourth selector switch, and a fifth selector switch. The first end of the first selector switch is connected to the first end of the second selector switch. The second end of the first selector switch is connected to the positive electrode of the battery. The negative electrode of the battery is grounded. The third end of the first selector switch is left floating. The second end of the second selector switch is connected to the second end of the third selector switch. The second end of the second selector switch is also connected to the second end of the fifth selector switch. The second end of the second selector switch is also connected to the input end of the firing control module. The third end of the second selector switch is left floating. The third end of the third selector switch is connected to the output end of the voltage dividing module. The first end of the third selector switch is connected to the second end of the fourth selector switch. The third end of the fourth selector switch is grounded. The first end of the fourth selector is connected to the first end of the motor. The third end of the fifth selector is grounded. The first end of the fifth selector switch is connected to the second end of the motor.

[0016] In an embodiment of the present invention, the self-locking module includes a fifth resistor, a sixth resistor, a seventh resistor, a first optocoupler, and a second optocoupler. One end of the seventh resistor is connected to the first end of the fifth selector switch. The other end of the seventh resistor is connected to the anode of the light-emitting diode in the first optocoupler. The cathode of the light-emitting diode in the first optocoupler is grounded. The collector of the triode in the first optocoupler is connected to the second end of the second selector switch. The collector of the triode in the first optocoupler is also connected to the collector of the triode in the second optocoupler. The emitter of the triode in the first optocoupler is connected to one end of the sixth resistor. The emitter of the triode in the first optocoupler is also connected to the emitter of the triode in the second optocoupler. One end of the sixth resistor is also connected to one end of the fifth resistor. One end of the fifth resistor is also connected to the control end of the switch tube. The other end of the fifth resistor is connected to the anode of the light-emitting diode in the second optocoupler. The other end of the sixth resistor is connected to the cathode of the light-emitting diode in the second optocoupler. The cathode of the light-emitting diode in the second optocoupler is also grounded.

[0017] In an embodiment of the present invention, the self-locking module includes an eighth resistor, a ninth resistor, a tenth resistor, a first PNP transistor, and a second NPN transistor. One end of the eighth resistor is connected to the first end of the fifth selector switch. The collector of the first PNP transistor is connected to one end of the eighth resistor. The other end of the eighth resistor is connected to the base of the second NPN transistor. The emitter of the second NPN transistor is grounded. The collector of the second NPN transistor is connected to one end of the ninth resistor. One end of the ninth resistor is also connected to the control end of the switching transistor. The other end of the ninth resistor is connected to the base of the first PNP transistor. The emitter of the first PNP transistor is connected to one end of the tenth resistor. One end of the tenth resistor is also connected to the second end of the second selector switch. The other end of the tenth resistor is connected to one end of the ninth resistor.

[0018] In an embodiment of the present inventor, the first end of the fourth selector switch is further connected to the first end of the motor through a series-connected thermistor. The first end of the motor is connected to one end of a fifth capacitor. The second end of the motor is connected to the second end of the fifth capacitor.

[0019] According to another aspect of the embodiments of the present application, a control method for an electric stapler driving circuit is further provided, which is applied to any of the electric stapler driving circuits described above, and includes:

[0020] Applying the output voltage of the battery to the motor, and controlling the firing of the electric stapler based on the working state of the switching transistor in the firing control module;

[0021] When the firing situation of the electric stapler is firing, perform a knife retraction operation after firing through the switch control;

[0022] During the knife retraction operation, switch the switching transistor in the firing control module from the conducting state to the cut-off state through the self-locking module.

[0023] In another embodiment of the present inventor, controlling the firing of the electric stapler according to the working state of the switching transistor in the firing control module includes: when the working state of the switching transistor is conducting, the electric stapler is in the firing state; when the working state of the switching transistor is cut off, the electric stapler is in the fired state.

[0024] The present application provides an electric stapler driving circuit and its control method. The circuit includes a switch control module, a firing control module, a voltage dividing module, and a self-locking module. The voltage of the battery is applied to the motor through the switch control module, enabling the electric stapler to perform a retraction operation after firing. When the voltage of the battery is applied to the motor, the firing condition of the electric stapler is controlled according to the switching tube in the firing control module, without being affected by external forces. The voltage at the output end of the firing control module is divided through the voltage dividing module to reduce the driving impact of the battery on the motor. During the retraction operation, the state of the switching tube in the firing control module is switched from conduction to cutoff through the self-locking module, realizing the integrated design of the battery and the electric stapler gun. When the battery is plugged in, no additional current is consumed, which not only reduces the volume of the electric stapler but also simplifies the operation process.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present invention. Brief Description of the Drawings

[0026] The accompanying drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present invention and, together with the specification, are used to explain the principles of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0027] Figure 1 is a block diagram of an electric stapler driving circuit shown in an exemplary embodiment of the present invention;

[0028] Figure 2 is a specific structural diagram of an electric stapler driving circuit shown in an exemplary embodiment of the present invention

[0029] Figure 3 is a specific structural diagram of an electric stapler driving circuit shown in another exemplary embodiment of the present invention;

[0030] Reference Numerals: 11 - Firing Control Module, 12 - Voltage Dividing Module, 13 - Switch Control Module, 14 - Self-Locking Module. Detailed Description of the Embodiments

[0031] The following will illustrate the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0032] It should be noted that the illustrations provided in the following embodiments only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and proportion of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0033] In the following description, a large number of details are explored to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0034] The endoscopic stapler (endoscopic cutting stapler and disposable staple cartridge) is one of the important instruments in endoscopic surgery. It replaces traditional manual suturing and uses titanium staples to sever or anastomose tissues. The operation is simple and rapid, greatly shortening the operation time. The endoscopic stapler makes it easy and accurate to suture difficult manual operations with a narrow field of view and deep parts, significantly reducing the incidence of anastomotic leakage. According to the different power transmission methods, the stapler can be divided into manual and electric types. The electric stapler uses an electric motor to drive the anastomosis, and its main function is to achieve automatic anastomosis or release of the anastomosis.

[0035] The inventor's research found that after the battery is connected to the electric stapler body in a traditional electric stapler, the current in the battery flows through the relay contacts and then back to the battery to form a circuit. There is always current consumption during the stage when the jaws are open, and the formed circuit consumes the power in the battery. Therefore, generally, the battery is inserted only during use, but this increases the operation process; the firing state of the electric stapler is reacted by the magnetic force of the relay with a permanent magnet. Under the action of jitter or a certain external force, the mechanical contacts of the permanent magnet are prone to reverse, and the electric stapler in the standby state cannot work normally and needs to re-open and close the jaws to reset before it can work normally; after the jaws of the electric stapler are closed and the staple cartridge is fired, the mechanical structure will feedback a physical signal to make the electric stapler automatically perform knife withdrawal. After the knife withdrawal is completed, through the function of circuit switching and locking maintenance, it is ensured that the firing button will not fire again. The traditional electric stapler uses a dual coil of a magnetic latching relay to switch states, and driving the magnetic latching relay requires a current ranging from several milliamperes to 100 milliamperes. The magnetic force generated by electromagnetic conversion attracts the mechanical contacts, and the relay with a permanent magnet makes the traditional electric stapler large in size and high in manufacturing cost.

[0036] Please refer to Figure 1 , Figure 1 which is a block diagram of the driving circuit of the electric stapler shown in an exemplary embodiment of the present invention.

[0037] As Figure 1 shown, in an exemplary embodiment of the present application, an electric stapler driving circuit includes:

[0038] A switch control module 13, connected to the battery and the motor. The switch control module 13 applies the output voltage of the battery to the motor so that the electric stapler performs a knife retraction operation after firing;

[0039] A firing control module 11, connected to the switch control module 13, controls the firing of the electric stapler according to the working state of the switch tube;

[0040] A voltage dividing module 12, connected to the firing control module 11, divides the voltage at the output end of the firing control module 11;

[0041] A self-locking module 14, connected to the motor, the switch control module 13, and the firing control module 11. During the knife retraction operation, based on the driving voltage sent by the switch control module 13, the switch tube of the firing control module 11 is switched from the conducting state to the cut-off state.

[0042] Specifically, the switch tube in the firing control module is a PMOS tube or an NMOS tube. When the switch tube is a PMOS tube, the self-locking module includes an optocoupler; when the switch tube is an NMOS tube, the self-locking module includes a transistor.

[0043] Embodiment 1

[0044] Please refer to Figure 2 , Figure 2 which is a specific structure diagram of the electric stapler driving circuit shown in an exemplary embodiment of the present invention.

[0045] Specifically, as Figure 2 shown, the firing control module 11 includes a first resistor R1, a first capacitor C1, and a switch tube Q1. One end of the first resistor R1 is connected to the first end of the switch tube Q1, the other end of the first resistor R1 is connected to the control end of the switch tube Q1, and the first capacitor C1 is connected in parallel with the first resistor R1. Among them, the first end of the switch tube Q1 is the input end of the firing control module 11, the second end of the switch tube Q1 is the output end of the firing control module 11, and the control end of the switch tube Q1 is the control end of the firing control module 11.

[0046] It should be noted that in Embodiment 1, the switch tube Q1 is a PMOS tube.

[0047] Specifically, as Figure 2As shown, the voltage division module 12 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first NPN transistor Q2, and a voltage regulator chip D1. One end of the second resistor R2 is connected to the collector of the first NPN transistor Q2, and the other end of the second resistor R2 is connected to the base of the first NPN transistor Q2. The base of the first NPN transistor Q2 is also connected to the cathode of the voltage regulator chip D1. The anode of the voltage regulator chip D1 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the emitter of the first NPN transistor Q2. The other end of the third resistor R3 is also connected to the control terminal of the voltage regulator chip D1. One end of the fourth resistor R4 is connected to the anode of the voltage regulator chip D1, and the other end of the fourth resistor R4 is connected to the control terminal of the voltage regulator chip D1. Among them, the collector of the first NPN transistor Q2 is the input end of the voltage division module 12. The input end of the voltage division module 12 is connected to the second end of the switching transistor Q1. One end of the third resistor R3 is the output end of the voltage division module 12.

[0048] It should be emphasized that the voltage division module 12 divides the voltage at the output end of the firing control module 11. The voltage division module is not affected by the battery voltage, and the load current is constant, reducing the driving impact on the motor and performing slow firing on the electric stapler.

[0049] More specifically, as Figure 2 shown, the switch control module 13 includes a first selector switch SW1, a second selector switch SW2, a third selector switch SW3, a fourth selector switch SW4, and a fifth selector switch SW5. The first end of the first selector switch SW1 is connected to the first end of the second selector switch SW2. The second end of the first selector switch SW1 is connected to the positive electrode of the battery. The negative electrode of the battery is grounded. The third end of the first selector switch SW1 is left floating. The second end of the second selector switch SW2 is connected to the second end of the third selector switch SW3. The second end of the second selector switch SW2 is also connected to the second end of the fifth selector switch SW5. The second end of the second selector switch SW2 is also connected to the input end of the firing control module 11. The second end of the second selector switch SW2 is also connected to the first end of the switching transistor Q1. The third end of the second selector switch SW2 is left floating. The third end of the third selector switch SW3 is connected to the output end of the voltage division module 12. The third end of the third selector switch SW3 is connected to one end of the third resistor R3. The first end of the third selector switch SW3 is connected to the second end of the fourth selector switch SW4. The third end of the fourth selector switch SW4 is grounded. The first end of the fourth selector switch SW4 is connected to the first end of the motor. The third end of the fifth selector switch SW5 is grounded. The first end of the fifth selector switch SW5 is connected to the second end of the motor.

[0050] More specifically, as Figure 2As shown, the switch control module 13 further includes a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. The first end of the fourth selector switch SW4 is connected to the second end of the second selector switch SW2 after being connected in series with the second capacitor C2. The first end of the fourth selector switch SW4 is connected to the second end of the fourth selector switch SW4 after being connected in series with the third capacitor C3. The first end of the fifth selector switch SW5 is connected to the second end of the fifth selector switch SW5 after being connected in series with the fourth capacitor C4. Specifically, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 limit the current in the electric stapler driving circuit provided in this application, reduce the impact of large current, absorb high-voltage spike peaks, reduce the electric spark caused by the opening and closing of contacts, and improve the characteristics of electromagnetic interference.

[0051] More specifically, as Figure 2 shown, the self-locking module 14 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first optocoupler U1, and a second optocoupler U2. One end of the seventh resistor R7 is connected to the first end of the fifth selector switch SW5. The other end of the seventh resistor R7 is connected to the anode of the light-emitting diode in the first optocoupler U1. The cathode of the light-emitting diode in the first optocoupler U1 is grounded. The collector of the transistor in the first optocoupler U1 is connected to the second end of the second selector switch SW2. The collector of the transistor in the first optocoupler U1 is also connected to the collector of the transistor in the second optocoupler U2. The emitter of the transistor in the first optocoupler U1 is connected to one end of the sixth resistor R6. The emitter of the transistor in the first optocoupler U1 is also connected to the emitter of the transistor in the second optocoupler U2. One end of the sixth resistor R6 is also connected to one end of the fifth resistor R5. One end of the fifth resistor R5 is also connected to the control end of the switch transistor Q1. The other end of the fifth resistor R5 is connected to the anode of the light-emitting diode in the second optocoupler U2. The other end of the sixth resistor R6 is connected to the cathode of the light-emitting diode in the second optocoupler U2. The cathode of the light-emitting diode in the second optocoupler U2 is also grounded.

[0052] More specifically, as Figure 2 shown, the first end of the fourth selector switch SW4 is also connected to the first end of the motor after being connected in series with a thermistor NTC. The first end of the motor is connected to one end of a fifth capacitor C5. The second end of the motor is connected to the second end of the fifth capacitor C5. It should be emphasized that the motor in the electric stapler is a DC brush motor. At the moment of starting, the peak voltage is extremely high. By connecting the thermistor NTC1 in series at the common end of the motor, the initial impedance of the thermistor NTC1 is high and the current limiting is large, which forms a complement with the initial impedance and large current of the motor. When the motor starts, the impedance of the thermistor will rise, and it will not affect the power of the motor. The fifth capacitor C5 absorbs high-voltage spike peaks to improve the characteristics of electromagnetic interference.

[0053] As Figure 1-2As shown below, the principle of the driving circuit of the electric stapler provided by this application is as follows:

[0054] (1) When the electric stapler is in the standby state, the first end of the first selector switch SW1 is connected to the second end of the first selector switch SW1, the first end of the second selector switch SW2 is connected to the third end of the second selector switch SW2, the first end of the third selector switch SW3 is connected to the third end of the third selector switch SW3, the first end of the fourth selector switch SW4 is connected to the second end of the fourth selector switch SW4, the first end of the fifth selector switch SW5 is connected to the third end of the fifth selector switch SW5, and the control end of the switching tube Q1 in the firing control module 11 is grounded through the sixth resistor R6. The switching tube Q1 is in the conducting state. Since the first end of the second selector switch SW2 is connected to the third end of the second selector switch SW2, the electric stapler is in the standby state. Although the battery is integrally designed with the electric stapler, it does not consume the battery power.

[0055] (2) When the electric stapler is in the firing state, first, the first end of the first selector switch SW1 is connected to the second end of the first selector switch SW1, the first end of the second selector switch SW2 is connected to the second end of the second selector switch SW2, the first end of the third selector switch SW3 is connected to the third end of the third selector switch SW3, the first end of the fourth selector switch SW4 is connected to the second end of the fourth selector switch SW4, the first end of the fifth selector switch SW5 is connected to the third end of the fifth selector switch SW5. The current generated by the output voltage of the battery flows through the first selector switch SW1, the second selector switch SW2, the firing control module 11, the voltage dividing module 12, the third selector switch SW3, the fourth selector switch SW4, and the thermistor NTC1 in sequence, then enters from the first end of the motor, exits from the second end of the motor, and then enters the ground through the fifth selector switch SW5 to start and drive the motor, realizing slow firing of the electric stapler.

[0056] Secondly, when the rotational speed of the motor reaches the preset output power, the first terminal of the first selector switch SW1 is connected to the second terminal of the first selector switch SW1, the first terminal of the second selector switch SW2 is connected to the second terminal of the second selector switch SW2, the first terminal of the third selector switch SW3 is connected to the second terminal of the third selector switch SW3, the first terminal of the fourth selector switch SW4 is connected to the second terminal of the fourth selector switch SW4, the first terminal of the fifth selector switch SW5 is connected to the third terminal of the fifth selector switch SW5. The current generated by the output voltage of the battery flows through the first selector switch SW1, the second selector switch SW2, the third selector switch SW3, the fourth selector switch SW4, and the thermistor NTC1 in sequence, then enters from the first terminal of the motor, exits from the second terminal of the motor, and then enters the ground through the fifth selector switch SW5 after passing through the fifth selector switch SW5, driving the motor to achieve rapid firing of the electric stapler. The jaws are closed by the motor to staple the designated part.

[0057] (3) After the electric stapler is fired, the electric stapler is in the knife return state. The first terminal of the first selector switch SW1 is connected to the second terminal of the first selector switch SW1, the first terminal of the second selector switch SW2 is connected to the second terminal of the second selector switch SW2, the first terminal of the third selector switch SW3 is connected to the second terminal of the third selector switch SW3, the first terminal of the fourth selector switch SW4 is connected to the third terminal of the fourth selector switch SW4, the first terminal of the fifth selector switch SW5 is connected to the second terminal of the fifth selector switch SW5. The current generated by the output voltage of the battery flows through the first selector switch SW1, the second selector switch SW2, and the fifth selector switch SW5 in sequence, then enters from the second terminal of the motor, exits from the first terminal of the motor, and then enters the ground through the thermistor NTC1 and the fourth selector switch SW4, driving the motor in reverse to open the jaws.

[0058] During the knife return operation, the driving voltage output from the first terminal of the fifth selector switch SW5, the driving voltage is a high level, and the driving voltage makes the first optocoupler U1 conduct. Since the second optocoupler U2 and the first optocoupler U1 are in a mirror image relationship, the second optocoupler U2 also conducts, converting the control terminal voltage of the switching transistor Q1 from a low level to a high level, and the switching transistor Q1 is turned off. The firing state of the electric stapler switches from firing to stopping firing.

[0059] Embodiment 2

[0060] Please refer to Figure 3 , Figure 3 which is the specific structural diagram of the driving circuit of the electric stapler shown in another exemplary embodiment of the present invention.

[0061] It should be emphasized that in Embodiment 2, the switching transistor Q1 in the firing control module is an NMOS transistor.

[0062] As shown Figure 3 in the figure, the self-locking module 14 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first PNP transistor Q3, and a second NPN transistor Q4. One end of the eighth resistor R8 is connected to the first end of the fifth selector switch SW5. The collector of the first PNP transistor Q3 is connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to the base of the second NPN transistor Q4. The emitter of the second NPN transistor Q4 is grounded. The collector of the second NPN transistor Q4 is connected to one end of the ninth resistor R9. One end of the ninth resistor R9 is also connected to the control end of the switching transistor Q1. The other end of the ninth resistor R9 is connected to the base of the first PNP transistor Q3. The emitter of the first PNP transistor Q3 is connected to one end of the tenth resistor R10. One end of the tenth resistor R10 is also connected to the second end of the second selector switch SW2. The other end of the tenth resistor R10 is connected to one end of the ninth resistor R9.

[0063] The working principle of Embodiment 2 provided by this application is as follows:

[0064] When the electric stapler is in the standby state, the first end of the second selector switch SW2 is connected to the third end of the second selector switch SW2, and the output voltage of the battery does not act on the motor, and the firing control module does not control the firing of the electric stapler.

[0065] When the electric stapler is in the firing state, the first end of the second selector switch SW2 is connected to the second end of the second selector switch SW2, the first end of the fifth selector switch SW5 is connected to the third end of the fifth selector switch SW5, the switching transistor Q1 is turned on, the first PNP transistor Q3 is turned off, and the second NPN transistor Q4 is turned off.

[0066] During the knife retraction operation, the driving voltage output from the first end of the fifth selector switch SW5, the driving voltage is at a high level, and the driving voltage causes the second NPN transistor Q4 to conduct. Because the second NPN transistor Q4 conducts, the first PNP transistor Q3 also conducts, converting the control end voltage of the switching transistor Q1 from a high level to a low level, and the switching transistor Q1 is turned off, and the firing state of the electric stapler switches from firing to stopping firing.

[0067] This application also provides a control method for an electric stapler drive circuit, which is applied to the electric stapler drive circuit described above, and includes:

[0068] Applying the output voltage of the battery to the motor, and controlling the firing of the electric stapler based on the working state of the switching transistor in the firing control module;

[0069] When the firing situation of the electric stapler is firing, perform a knife retraction operation after firing through the switch control module;

[0070] During the knife retraction operation, the switch tube of the firing control module is switched from the conducting state to the cut-off state through the self-locking module.

[0071] Specifically, the firing of the electric stapler is controlled according to the working state of the switch tube in the firing control module, including: when the working state of the switch tube is conducting, the electric stapler is in the firing state; when the working state of the switch tube is cut off, the electric stapler is in the fired state. Specifically, when the output voltage of the battery acts on the motor, when the switch tube Q1 is conducting, the electric stapler is in the firing state, and when the switch tube Q1 is cut off, the electric stapler stops firing and performs the knife retraction operation.

[0072] The present application provides an electric stapler drive circuit and its control method. The circuit includes a switch control module, a firing control module, a voltage dividing module and a self-locking module. The voltage of the battery is applied to the motor through the switch control module, so that the electric stapler performs the knife retraction operation after firing; when the voltage of the battery acts on the motor, the firing of the electric stapler is controlled according to the switch tube in the firing control module, without being affected by external forces; the output voltage of the firing control module is divided by the voltage dividing module to reduce the driving impact of the battery on the motor; during the knife retraction operation, the state of the switch tube in the firing control module is switched from conducting to cut off through the self-locking module, realizing the integrated design of the battery and the electric stapler gun. The battery will not consume extra current when plugged in, which not only reduces the volume of the electric stapler, but also simplifies the operation process.

[0073] The above embodiments are only used to exemplarily illustrate the principles and effects of the present invention, rather than to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. An electric stapler drive circuit, characterized in that Comprising: A switch control module, connected to a battery and a motor, the switch control module applying the output voltage of the battery to the motor so that the electric stapler performs a knife retraction operation after firing; A firing control module, connected to the switch control module, controlling the firing of the electric stapler according to the working state of a switch tube; A voltage division module, connected to the firing control module, dividing the voltage at the output end of the firing control module; A self-locking module, connected to the motor, the switch control module, and the firing control module, during the knife retraction operation, switching the switch tube of the firing control module from the conducting state to the cut-off state based on the driving voltage sent by the switch control module.

2. The electric stapler drive circuit according to claim 1, wherein, The switch tube in the firing control module is a PMOS tube or an NMOS tube. When the switch tube is a PMOS tube, the self-locking module includes an optocoupler; when the switch tube is an NMOS tube, the self-locking module includes a transistor.

3. The electric stapler driving circuit according to claim 2, wherein The firing control module includes a first resistor, a first capacitor, and a switch tube. One end of the first resistor is connected to the first end of the switch tube, the other end of the first resistor is connected to the control end of the switch tube, and the first capacitor is connected in parallel with the first resistor. Among them, the first end of the switch tube is the input end of the firing control module, the second end of the switch tube is the output end of the firing control module, and the control end of the switch tube is the control end of the firing control module.

4. The electric stapler driving circuit according to claim 3, characterized in that, The voltage division module includes a second resistor, a third resistor, a fourth resistor, a first NPN transistor, and a voltage regulator chip. One end of the second resistor is connected to the collector of the first NPN transistor, the other end of the second resistor is connected to the base of the first NPN transistor, the base of the first NPN transistor is also connected to the cathode of the voltage regulator chip, the anode of the voltage regulator chip is connected to one end of the third resistor, the other end of the third resistor is connected to the emitter of the first NPN transistor, the other end of the third resistor is also connected to the control end of the voltage regulator chip, one end of the fourth resistor is connected to the anode of the voltage regulator chip, and the other end of the fourth resistor is connected to the control end of the voltage regulator chip. Among them, the collector of the first NPN transistor is the input end of the voltage division module, and one end of the third resistor is the output end of the voltage division module.

5. The electric stapler driving circuit according to claim 4, characterized in that, The switch control module includes a first selector switch, a second selector switch, a third selector switch, a fourth selector switch, and a fifth selector switch. The first end of the first selector switch is connected to the first end of the second selector switch. The second end of the first selector switch is connected to the positive electrode of the battery, the negative electrode of the battery is grounded, and the third end of the first selector switch is floating. The second end of the second selector switch is connected to the second end of the third selector switch, and the second end of the second selector switch is also connected to the second end of the fifth selector switch. The second end of the second selector switch is also connected to the input end of the firing control module, and the third end of the second selector switch is floating. The third end of the third selector switch is connected to the output end of the voltage dividing module. The first end of the third selector switch is connected to the second end of the fourth selector switch. The third end of the fourth selector switch is grounded, the first end of the fourth selector switch is connected to the first end of the motor, the third end of the fifth selector switch is grounded, and the first end of the fifth selector switch is connected to the second end of the motor.

6. The electric stapler drive circuit according to claim 5, wherein, The self-locking module includes a fifth resistor, a sixth resistor, a seventh resistor, a first optocoupler, and a second optocoupler. One end of the seventh resistor is connected to the first end of the fifth selector switch, and the other end of the seventh resistor is connected to the anode of the light-emitting diode in the first optocoupler. The cathode of the light-emitting diode in the first optocoupler is grounded. The collector of the triode in the first optocoupler is connected to the second end of the second selector switch, and the collector of the triode in the first optocoupler is also connected to the collector of the triode in the second optocoupler. The emitter of the triode in the first optocoupler is connected to one end of the sixth resistor, and the emitter of the triode in the first optocoupler is also connected to the emitter of the triode in the second optocoupler. One end of the sixth resistor is also connected to one end of the fifth resistor, and one end of the fifth resistor is also connected to the control end of the switch tube. The other end of the fifth resistor is connected to the anode of the light-emitting diode in the second optocoupler, the other end of the sixth resistor is connected to the cathode of the light-emitting diode in the second optocoupler, and the cathode of the light-emitting diode in the second optocoupler is also grounded.

7. The electric stapler drive circuit according to claim 5, characterized in that, The self-locking module includes an eighth resistor, a ninth resistor, a tenth resistor, a first PNP transistor, and a second NPN transistor. One end of the eighth resistor is connected to the first end of the fifth selector switch. The collector of the first PNP transistor is connected to one end of the eighth resistor. The other end of the eighth resistor is connected to the base of the second NPN transistor. The emitter of the second NPN transistor is grounded. The collector of the second NPN transistor is connected to one end of the ninth resistor. One end of the ninth resistor is also connected to the control end of the switching transistor. The other end of the ninth resistor is connected to the base of the first PNP transistor. The emitter of the first PNP transistor is connected to one end of the tenth resistor. One end of the tenth resistor is also connected to the second end of the second selector switch. The other end of the tenth resistor is connected to one end of the ninth resistor.

8. The electric stapler driving circuit according to claim 4, wherein, The first end of the fourth selector switch is also connected to the first end of the motor through a series-connected thermistor. The first end of the motor is connected to one end of a fifth capacitor. The second end of the motor is connected to the second end of the fifth capacitor.

9. A control method for an electric stapler drive circuit, characterized in that, Applied to the electric stapler driving circuit according to any one of claims 1-8, comprising: Applying the output voltage of the battery to the motor, and controlling the firing of the electric stapler based on the working state of the switching transistor in the firing control module; When the firing situation of the electric stapler is firing, performing a knife return operation after firing through the switch control module; During the knife return operation, switching the switching transistor in the firing control module from the conducting state to the cut-off state through the self-locking module.

10. The control method of the driving circuit of the electric stapler according to claim 9, characterized in that, The controlling the firing of the electric stapler according to the working state of the switching transistor in the firing control module includes: When the working state of the switching transistor is conducting, the electric stapler is in the firing state; When the working state of the switching transistor is cut-off, the electric stapler is in the fired state.

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