Ultrasonic knife control system and signal processing circuit

Abstract

The embodiment of the invention relates to the technical field of medical instruments, and discloses an ultrasonic knife control system and a signal processing circuit. The ultrasonic knife control system comprises an ultrasonic knife, a signal processing circuit and a controller, the ultrasonic knife is used for outputting a first voltage signal carrying a first interference signal to the signal processing circuit in response to the configuration instruction; the signal processing circuit is used for processing the first voltage signal loaded with the first interference signal to obtain a second voltage signal loaded with a second interference signal and a signal acquisition control signal; performing signal acquisition on a second voltage signal carrying a second interference signal based on the signal acquisition control signal to obtain a target voltage signal; and the controller is used for generating a control signal of the ultrasonic knife based on the target voltage signal and outputting the control signal to the ultrasonic knife. Based on the technical scheme of the invention, not only can the accuracy and safety of the operation be improved, but also the applicability and expandability of the system are improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the application relates to the technical field of medical instruments, and particularly relates to an ultrasonic knife control system and a signal processing circuit. BACKGROUND

[0002] At present, the use scene of medical instruments is increasingly diversified. In some minimally invasive surgery scenes, due to the limitation of the operation space and the convenience of operation, it is necessary to alternately or cooperatively use an ultrasonic knife and an electric knife in the same operation area. In this way, the electric knife signal output by the electric knife will cause serious interference to the ultrasonic knife signal output by the ultrasonic knife in various ways such as electromagnetic radiation and conduction, so as to cause a large number of high-frequency interference signals to be included in the ultrasonic knife signal. Generally, the high-frequency interference signals in the ultrasonic knife signal can be filtered out by using a traditional filtering method.

[0003] However, the traditional filtering method has obvious limitations, which can cause the high-frequency interference signals in the ultrasonic knife signal to be retained, or cause part of the high-frequency components required for the operation of the ultrasonic knife to be mistakenly filtered out, so that there is a deviation between the obtained ultrasonic knife signal and the original pure ultrasonic knife signal. Further, the precision and safety of the operation are affected. SUMMARY

[0004] In view of the above problems, the embodiment of the application provides an ultrasonic knife control system and a signal processing circuit, which are used for solving the problem that there is a deviation between the ultrasonic knife signal obtained by using the existing filtering method and the original pure ultrasonic knife signal.

[0005] The first aspect of the embodiment of the application provides an ultrasonic knife control system, which comprises an ultrasonic knife, a signal processing circuit and a controller. The input end of the signal processing circuit is coupled with the output end of the ultrasonic knife, the output end of the signal processing circuit is coupled with the control input end of the controller, the control output end of the controller is coupled with the input end of the ultrasonic knife. The ultrasonic knife is used for outputting a first voltage signal carrying a first interference signal to the signal processing circuit in response to a configuration instruction. The signal processing circuit is used for processing the first voltage signal carrying the first interference signal to obtain a second voltage signal carrying a second interference signal and a signal acquisition control signal. The second voltage signal carrying the second interference signal is subjected to signal acquisition based on the signal acquisition control signal to obtain a target voltage signal. The controller is used for generating a control signal of the ultrasonic knife based on the target voltage signal and outputting the control signal to the ultrasonic knife.

[0006] In some embodiments, the signal processing circuit includes a first voltage processing circuit and a second voltage processing circuit; an input end of the first voltage processing circuit is an input end of the signal processing circuit; an output end of the first voltage processing circuit is coupled with an input end of the second voltage processing circuit; an output end of the second voltage processing circuit is an output end of the signal processing circuit; the first voltage processing circuit is configured to perform amplitude adjustment on a first voltage signal carrying a first interference signal to obtain a second voltage signal carrying a second interference signal; the second voltage processing circuit is configured to perform processing on the second voltage signal carrying the second interference signal to obtain a signal acquisition control signal; and the second voltage signal carrying the second interference signal is acquired based on the signal acquisition control signal to obtain a target voltage signal.

[0007] In some embodiments, the second voltage processing circuit includes a zero-crossing comparison circuit and a signal acquisition circuit; an input end of the zero-crossing comparison circuit is coupled with an input end of the second voltage processing circuit; an output end of the zero-crossing comparison circuit is coupled with a control input end of the signal acquisition circuit; a signal input end of the signal acquisition circuit is coupled with an output end of the first voltage processing circuit; a signal output end of the signal acquisition circuit is an output end of the second voltage processing circuit; the zero-crossing comparison circuit is configured to perform zero-crossing detection on the second voltage signal carrying the second interference signal to obtain the signal acquisition control signal; and the signal acquisition circuit is configured to perform signal acquisition on the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain the target voltage signal.

[0008] In some embodiments, the zero-crossing comparison circuit includes a filter circuit and a zero-crossing comparator; an input end of the filter circuit is an input end of the zero-crossing comparison circuit; an output end of the filter circuit is coupled with an input end of the zero-crossing comparator; an output end of the zero-crossing comparator is an output end of the zero-crossing comparison circuit; the filter circuit is configured to perform filter processing on the second voltage signal carrying the second interference signal to obtain the second interference signal; and the zero-crossing comparator is configured to perform zero-crossing detection on the second interference signal to obtain the signal acquisition control signal.

[0009] In some embodiments, the filter circuit includes a first resistor and a first capacitor; a first end of the first resistor is an input end of the filter circuit, and a second end of the first resistor is coupled with an output end of the filter circuit; the first capacitor is connected across the output end of the filter circuit and a ground end.

[0010] In some embodiments, the first voltage signal includes an ultrasonic knife signal of a first frequency; the first interference signal includes an electrotome output signal of an electrotome signal of a second frequency; and the first frequency is less than the second frequency.

[0011] In some embodiments, the signal acquisition control signal is a pulse signal; when the pulse signal changes from the second level to the first level, the signal processing circuit starts the signal acquisition of the second voltage signal carrying the second interference signal; and when the pulse signal changes from the first level to the second level, the signal processing circuit stops the signal acquisition of the second voltage signal carrying the second interference signal.

[0012] A second aspect of the embodiments of the present application provides a signal processing circuit, which comprises a first voltage processing circuit and a second voltage processing circuit; an input end of the first voltage processing circuit is an input end of the signal processing circuit; an output end of the first voltage processing circuit is coupled with an input end of the second voltage processing circuit; an output end of the second voltage processing circuit is an output end of the signal processing circuit; the first voltage processing circuit is configured to perform amplitude adjustment on a first voltage signal carrying a first interference signal to obtain a second voltage signal carrying a second interference signal; the second voltage processing circuit is configured to perform processing on the second voltage signal carrying the second interference signal to obtain a signal acquisition control signal; and the second voltage signal carrying the second interference signal is acquired based on the signal acquisition control signal to obtain a target voltage signal.

[0013] In some embodiments, the second voltage processing circuit comprises a zero-crossing comparison circuit and a signal acquisition circuit; an input end of the zero-crossing comparison circuit is coupled with the input end of the second voltage processing circuit; an output end of the zero-crossing comparison circuit is coupled with a control input end of the signal acquisition circuit; a signal input end of the signal acquisition circuit is coupled with the output end of the first voltage processing circuit; a signal output end of the signal acquisition circuit is the output end of the second voltage processing circuit; the zero-crossing comparison circuit is configured to perform zero-crossing detection on the second voltage signal carrying the second interference signal to obtain the signal acquisition control signal; and the signal acquisition circuit is configured to perform signal acquisition on the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain the target voltage signal.

[0014] In some embodiments, the zero-crossing comparison circuit comprises a filter circuit and a zero-crossing comparator; an input end of the filter circuit is the input end of the zero-crossing comparison circuit; an output end of the filter circuit is coupled with an input end of the zero-crossing comparator; an output end of the zero-crossing comparator is the output end of the zero-crossing comparison circuit; the filter circuit is configured to perform filter processing on the second voltage signal carrying the second interference signal to obtain the second interference signal; and the zero-crossing comparator is configured to perform zero-crossing detection on the second interference signal to obtain the signal acquisition control signal.

[0015] In the ultrasonic knife control system provided by the embodiments of the present application, when the signal acquisition control signal includes a plurality of sampling points corresponding to the high-frequency interference signal with a zero amplitude, the second ultrasonic knife signal carrying the high-frequency interference signal is acquired based on the signal acquisition control signal, so that the target voltage signal without the high-frequency interference signal can be obtained, that is, the pure ultrasonic knife signal can be accurately acquired. Then, the control signal of the ultrasonic knife can be accurately generated based on the target voltage signal, so that the precise control of the ultrasonic knife is realized. Therefore, the precision and safety of the operation are improved.

[0016] Meanwhile, the ultrasonic knife operation system described above does not need to perform complex signal processing on the second ultrasonic knife signal carrying the high-frequency interference signal, that is, a high-performance multi-core processor or a large-scale memory resource is not needed to support complex algorithm operation, so that the dependence of the system on hardware resources is reduced. Moreover, the ultrasonic knife operation system described above only needs a controller with a lower configuration to realize the stable extraction of the ultrasonic knife signal, so that not only the hardware cost is reduced, but also the power consumption is reduced, and the device endurance time or service life is prolonged. Furthermore, the lower hardware resource requirement makes the system smaller in size and simpler in structure, which is beneficial to popularization in application scenarios with strict restrictions on the size and complexity of the device, such as portable medical devices and intelligent sensor nodes, so that the applicability and scalability of the system are improved.

[0017] The above description is only a summary of the technical solutions of the embodiments of the present application, in order to more clearly understand the technical means of the embodiments of the present application, the embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are only used to show the embodiments and are not considered as limitations of the present application. Moreover, the same reference signs are used to represent the same components throughout the drawings. In the drawings:

[0019] Figure 1 A structure schematic diagram of an ultrasonic knife control system provided by the embodiments of the present application is shown in FIG. 1.

[0020] Figure 2 A waveform schematic diagram of a first interference signal, a first voltage signal and a first voltage signal carrying the first interference signal provided by the embodiments of the present application is shown in FIG. 2.

[0021] Figure 3 A structure schematic diagram of another ultrasonic knife control system provided by the embodiments of the present application is shown in FIG. 3.

[0022] Figure 4 A structure schematic diagram of still another ultrasonic knife control system provided by the embodiments of the present application is shown in FIG. 4.

[0023] Figure 5A structure schematic diagram of still another ultrasonic knife control system provided by an embodiment of the present application;

[0024] Figure 6 A structure schematic diagram of still another ultrasonic knife control system provided by an embodiment of the present application;

[0025] Figure 7 A structure schematic diagram of still another ultrasonic knife control system provided by an embodiment of the present application;

[0026] Figure 8 A structure schematic diagram of a signal processing circuit provided by an embodiment of the present application;

[0027] Figure 9 A structure schematic diagram of another signal processing circuit provided by an embodiment of the present application;

[0028] Figure 10 A structure schematic diagram of still another signal processing circuit provided by an embodiment of the present application;

[0029] Figure 11 A flow schematic diagram of an ultrasonic knife control method provided by an embodiment of the present application;

[0030] Figure 12 A flow schematic diagram of another ultrasonic knife control method provided by an embodiment of the present application;

[0031] Figure 13 A flow schematic diagram of still another ultrasonic knife control method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0032] The terminology used in the following description of the embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the embodiments and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0033] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to one or more feature, structure, or characteristic of a particular embodiment.

[0034] The terms "first", "second", etc. in the following embodiments of the present application are used only for descriptive purpose, and cannot be understood as implying or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features, and in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0035] For the convenience of understanding the present application, the terms involved in the present application are explained.

[0036] An ultrasonic knife is a medical instrument commonly used in surgery and minimally invasive surgery. It relies on an ultrasonic frequency generator to drive the metal knife head to produce high-frequency ultrasonic oscillation, so that the water molecules in the cells of the tissue in contact with the knife head vibrate and generate heat by friction, thereby realizing the cutting and coagulation of the tissue. With its precise cutting performance and relatively small thermal damage effect, the ultrasonic knife is widely used in neurosurgery, otolaryngology and laparoscopy, etc. fine surgery, which can minimize the thermal damage to the surrounding important nerves, blood vessels and other delicate tissue structures, is beneficial to the rapid recovery of the patient's function after surgery and reduces the occurrence of complications.

[0037] An electrotome is an electrosurgical instrument used for cutting tissue during surgery. It operates on the principle of the thermal effect of high-frequency current, generates high-frequency high-voltage current, and when the high-frequency high-voltage current comes into contact with human tissue, the electrical energy corresponding to the high-frequency high-voltage current is quickly converted into heat energy due to the electrical resistance characteristics of human tissue, heating human tissue to separate and coagulate human tissue, thereby achieving the functions of cutting and coagulation. The electrotome can quickly vaporize water and denature proteins in the tissue, thereby effectively cutting the tissue and sealing blood vessels, which can significantly reduce intraoperative bleeding and greatly speed up the surgical process when dealing with large blood vessel-rich tissues in general surgery.

[0038] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0039] With the development of medical technology and the diversification of patients, the complexity of surgery is increasing, and the application scenarios of medical instruments are also increasingly diversified. For the same surgical environment, especially in some minimally invasive surgery scenarios, due to the limitation of surgical space and the convenience of operation, it is necessary to alternately or cooperatively use ultrasonic knives and electrotomes in the same operation area. In this way, the strong electrotome signal generated during the operation of the electrotome will seriously interfere with the ultrasonic knife signal generated by the ultrasonic knife in various ways such as electromagnetic radiation and conduction. In terms of electromagnetic radiation, the alternating electromagnetic field generated by the electrotome signal will propagate in space, and the signal lines, power lines and internal signal processing circuits of the ultrasonic knife (equivalent to receiving antennas) will be inducted to the electrotome signal, resulting in a large amount of high-frequency noise components mixed in the ultrasonic knife signal received by the ultrasonic knife. In terms of conduction interference, if the ultrasonic knife and the electrotome share part of the power line or the ground line, the electrotome signal will be conducted to the corresponding circuit of the ultrasonic knife through the parasitic capacitance, inductance and other coupling elements between the lines, so that the ultrasonic knife signal output by the ultrasonic knife includes a large amount of high-frequency interference signals, resulting in the original pure ultrasonic knife signal being severely distorted.

[0040] The high-frequency interference can cause the originally accurately set ultrasonic vibration frequency, amplitude and phase parameters to be disordered, directly leading to a significant reduction in cutting and coagulation effect, and being unable to accurately process human tissues, increasing the difficulty and risk of surgical operation. At the same time, the high-frequency interference signal can also cause the control system of the ultrasonic knife to make a mistake, such as triggering an incorrect alarm signal or displaying incorrect working state information. In this way, not only does it interfere with the normal operation and judgment of the surgeon, but it can also cause unnecessary surgical pauses or adjustments due to incorrect working state information, further prolonging the operation time and posing a potential threat to the patient's life safety.

[0041] In order to solve the above technical problems, a traditional filtering method can be generally used to filter out the ultrasonic knife signal including a large amount of high-frequency interference signals. However, the traditional filtering method has obvious limitations. It is difficult to determine the appropriate cutoff frequency and filter order when designing the filter. If the cutoff frequency is set too low, although the high-frequency interference signals in the ultrasonic knife signal can be effectively filtered out, part of the high-frequency components required for the operation of the ultrasonic knife itself may be mistakenly filtered out, thereby affecting the normal working performance of the ultrasonic knife; on the contrary, if the cutoff frequency is set too high, the high-frequency interference signals in the ultrasonic knife signal cannot be completely filtered out, and the residual high-frequency interference signals will still have an adverse effect on the operation of the ultrasonic knife. In addition, the filter will inevitably introduce signal distortion in the process of filtering out the signal, causing problems such as amplitude attenuation and phase delay, so that there is a deviation between the ultrasonic knife signal output by the ultrasonic knife and the original pure ultrasonic knife signal, which cannot truly reflect the actual situation of the tissue, thereby affecting the accuracy and safety of the surgery.

[0042] Based on the above technical problems, an embodiment of the present application provides an ultrasonic scalpel system, which includes an ultrasonic scalpel, a signal processing circuit, and a controller. The ultrasonic scalpel outputs a first ultrasonic scalpel signal carrying a high-frequency interference signal to the signal processing circuit, and the signal processing circuit processes the first ultrasonic scalpel signal carrying the high-frequency interference signal to obtain a signal acquisition control signal and a second ultrasonic scalpel signal carrying the high-frequency interference signal. The second ultrasonic scalpel signal carrying the high-frequency interference signal is then acquired based on the signal acquisition control signal to obtain a target ultrasonic scalpel signal. In this way, when the signal acquisition control signal includes multiple sampling points corresponding to high-frequency interference signals with zero amplitude, the second ultrasonic scalpel signal carrying the high-frequency interference signal is acquired based on the signal sampling control signal to obtain a target voltage signal that does not contain the high-frequency interference signal, that is, a pure ultrasonic scalpel signal can be accurately obtained. Furthermore, based on the target voltage signal, a control signal for the ultrasonic scalpel can be accurately generated to achieve precise control of the ultrasonic scalpel. This improves the accuracy and safety of the surgery.

[0043] At the same time, the ultrasonic knife operating system does not need to perform complex signal processing on the second ultrasonic knife signal carrying the high-frequency interference signal, that is, it does not require a high-performance multi-core processor or large-scale memory resources to support complex algorithm operations, thus reducing the system's dependence on hardware resources. Moreover, the ultrasonic knife operating system only requires a relatively low-configuration controller to achieve stable extraction of ultrasonic knife signals, which not only reduces hardware costs, but also helps to reduce power consumption and extend the device's battery life or service life. Furthermore, the lower hardware resource requirements make the system smaller and simpler in structure, which is conducive to promotion in application scenarios with strict restrictions on device size and complexity, such as portable medical devices, smart sensor nodes, etc., improving the applicability and scalability of the system.

[0044] Figure 1 This is a schematic diagram of the structure of an ultrasonic knife control system provided in an embodiment of the present application, such as Figure 1 As shown, the ultrasonic scalpel control system 10 includes an ultrasonic scalpel 101, a signal processing circuit 102 and a controller 103; the input end of the signal processing circuit 102 is coupled to the output end of the ultrasonic scalpel 101, and the output end of the signal processing circuit 102 is coupled to the control input end of the controller 103; the control output end of the controller 103 is coupled to the input end of the ultrasonic scalpel 101.

[0045] The ultrasonic scalpel 101 is configured to output a first voltage signal carrying a first interference signal to the signal processing circuit 102 in response to a configuration instruction;

[0046] The signal processing circuit 102 is configured to process the first voltage signal carrying the first interference signal to obtain a second voltage signal carrying a second interference signal and a signal acquisition control signal; and perform signal acquisition on the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain a target voltage signal.

[0047] The controller 103 is configured to generate a control signal of the ultrasonic knife based on the target voltage signal, and output the control signal to the ultrasonic knife.

[0048] Exemplarily, the ultrasonic knife 101 can include multiple operation modes, and the ultrasonic knife 101 can output ultrasonic knife signals of the same frequency but different voltage amplitudes and current amplitudes in different operation modes. The ultrasonic knife 101 can include a cutting mode, a coagulation mode, and a mixed mode, etc. The voltage amplitudes of the ultrasonic knife signals output by the ultrasonic knife 101 in the cutting mode, the coagulation mode, and the mixed mode can be different, and the current amplitudes of the ultrasonic knife signals output by the ultrasonic knife 101 in the cutting mode, the coagulation mode, and the mixed mode can also be different. In some examples, the voltage amplitude of the ultrasonic knife signal in the cutting mode can be a first amplitude in a first voltage amplitude range; the voltage amplitude of the ultrasonic knife signal in the coagulation mode can be a second amplitude in a second voltage amplitude range; and the voltage amplitude of the ultrasonic knife signal in the mixed mode can be a third amplitude in a third voltage amplitude range. The first voltage amplitude range and the second voltage amplitude range do not have an intersection, and the minimum voltage amplitude in the first voltage amplitude range is greater than the maximum voltage amplitude in the second voltage range; the third voltage amplitude range has an intersection with the first voltage amplitude range and the second voltage amplitude range. The voltage amplitude range, the first amplitude, the second amplitude, and the third amplitude of the ultrasonic knife signal in each mode are not limited in the embodiments of the present application. Exemplarily, the voltage amplitude of the ultrasonic knife signal in the cutting mode is 150V, the voltage amplitude of the ultrasonic knife signal in the coagulation mode is 90V, and the voltage amplitude of the ultrasonic knife signal in the mixed mode is 120V.

[0049] Similarly, in some examples, the current amplitude of the ultrasonic knife signal in the cutting mode can be a fourth amplitude in a first current amplitude range; the current amplitude of the ultrasonic knife signal in the coagulation mode can be a fifth amplitude in a second current amplitude range; and the current amplitude of the ultrasonic knife signal in the mixed mode can be a sixth amplitude in a third current amplitude range. The first current amplitude range and the second current amplitude range have no intersection, and the minimum current amplitude in the first current amplitude range is greater than the maximum current amplitude in the second current amplitude range; the third current amplitude range has an intersection with the first current amplitude range and the second current amplitude range. The present application does not limit the size of the current amplitude range, the fourth amplitude, the fifth amplitude and the sixth amplitude of the ultrasonic knife signal in each mode. The present application takes the current amplitude of the ultrasonic knife signal in the cutting mode as 900 mV, the current amplitude of the ultrasonic knife signal in the coagulation mode as 300 V, and the current amplitude of the ultrasonic knife signal in the mixed mode as 500 mA as an example for exemplary description.

[0050] The frequency of the ultrasonic knife signal in each operation mode can be any frequency value within a preset frequency range. In some examples, the preset frequency range can include 30 kHz to 50 kHz. In some examples, the frequency of the ultrasonic knife signal in each operation mode can be 30 kHz. In other examples, the frequency of the ultrasonic knife signal in each operation mode can be 45 kHz. In yet other examples, the frequency of the ultrasonic knife signal in each operation mode can be 50 kHz. The present application does not limit the size of the frequency of the ultrasonic knife signal in each operation mode.

[0051] The configuration instruction can be an instruction corresponding to the operation mode of the ultrasonic knife 101 determined by a user (e.g., a surgeon) according to the needs of the operation, and the configuration instruction can be generated by the ultrasonic knife 101 in response to the configuration operation input by the user. Then, the ultrasonic knife 101 can generate the ultrasonic knife signal in the corresponding mode in response to the configuration instruction corresponding to the different operation modes.

[0052] The first voltage signal can be an ultrasonic knife signal with a first frequency, a first voltage amplitude and a first current amplitude, and the size of the first voltage amplitude and the first current amplitude can be determined according to the operation mode corresponding to the configuration instruction. Taking the first voltage amplitude as 150 V and the first frequency as 55 kHz as an example, it can be seen from Figure 2 that the waveform of the first voltage signal can refer to waveform 201. Wherein, the abscissa is time, and the ordinate is amplitude.

[0053] The first interference signal can be an interference signal superimposed into the first voltage signal in various ways such as electromagnetic radiation and conduction. In some examples, the first interference signal can include an electrotome signal of a second frequency and a second voltage amplitude output by the electrotome. In other examples, the first interference signal can include an electrotome signal of a second frequency and a second voltage amplitude and a high frequency signal of a frequency greater than a preset frequency. The embodiments of the present disclosure are exemplarily described by taking the electrotome signal of the second frequency and the second voltage amplitude as the first interference signal.

[0054] Exemplarily, the second frequency can be between several hundred kilohertz and several megahertz. In some examples, the second frequency can be between 300 kHz and 5 MHz (megahertz). The second voltage amplitude can be the same as the first voltage amplitude. In some examples, the second voltage amplitude and the first voltage amplitude can both be 150 V. If the second frequency is 475 kHz, the second voltage amplitude is 150 V, and the first interference signal is an electrotome signal, the first interference signal can refer to the waveform 202 in Figure 2 .

[0055] The first voltage signal carrying the first interference signal can be a signal obtained after superimposing the first interference signal and the first voltage signal. The first voltage signal carrying the first interference signal can refer to the waveform 203 in Figure 2 , and can be obtained by superimposing the first voltage signal (waveform 201) and the first interference signal (waveform 202).

[0056] Exemplarily, if the operating area of the ultrasonic knife 101 and the electrotome is the same, and the electrotome is also working while the ultrasonic knife 101 is working, the ultrasonic knife 101 will be interfered by the electrotome signal generated by the operation of the electrotome. Further, when the ultrasonic knife 101 receives the mode configuration operation input by the user, the first voltage signal generated in response to the configuration instruction corresponding to the mode configuration operation will superimpose the electrotome signal, obtaining the first voltage signal carrying the first interference signal.

[0057] The second voltage signal can be an ultrasonic knife signal of a third voltage amplitude obtained after adjusting the first voltage amplitude of the first voltage signal. The third voltage amplitude and the first voltage amplitude can correspond to a first proportional relationship, and the first proportional relationship can be determined according to the requirement of the third voltage amplitude. If the requirement of the third voltage amplitude is less than or equal to the first voltage amplitude, the ratio K1 corresponding to the first proportional relationship can be greater than 0 and less than or equal to 1. In some examples, the third voltage amplitude can be the amplitude of the input voltage requirement of the signal acquisition circuit in the signal processing circuit 102. For example, the third voltage amplitude can be 3.3 V.

[0058] The second interference signal can be an electrosurgical signal with a fourth voltage amplitude obtained by amplitude adjustment on the second voltage amplitude of the first interference signal. The fourth voltage amplitude and the second voltage amplitude can correspond to a second proportional relationship, and the second proportional relationship can be determined according to the requirement of the fourth voltage amplitude. If the requirement of the fourth voltage amplitude is less than or equal to the second voltage amplitude, the ratio K2 corresponding to the second proportional relationship can be greater than 0 and less than or equal to 1. In some examples, the fourth voltage amplitude can be the same as the third voltage amplitude. For example, K2 and K1 can both be 0.1.

[0059] The signal acquisition control signal can be a signal for controlling the signal acquisition of the signal acquisition circuit in the signal processing circuit 102. In some examples, the signal acquisition control signal can be a pulse signal, and when the pulse signal changes from the second level to the first level, the signal processing circuit starts the signal acquisition of the second voltage signal carrying the second interference signal; when the pulse signal changes from the first level to the second level, the signal processing circuit stops the signal acquisition of the second voltage signal carrying the second interference signal.

[0060] In some examples, the first level can be a logic high level "1", and the second level can be a logic low level "0". In other examples, the first level can be a logic low level "0", and the second level can be a logic high level "1". The specific level of the first level and the second level is not limited in the embodiments of the present application. The embodiments of the present application are exemplarily described taking the first level as a logic high level "1" and the second level as a logic low level "0".

[0061] Taking the first level as a logic high level "1" and the second level as a logic low level "0" as an example, the signal processing circuit 102 can control to start the signal acquisition of the second voltage signal carrying the second interference signal at the rising edge of the square wave, and control to stop the signal acquisition of the second voltage signal carrying the second interference signal at the falling edge of the square wave.

[0062] Exemplarily, the amplitude of the target voltage signal can be the same as the third voltage amplitude of the second voltage signal. In some examples, the target voltage signal and the third voltage amplitude can both be 3.3V.

[0063] The controller 103 can generate a control signal of the ultrasonic knife 101 according to the target voltage signal and the reference voltage signal, and output the control signal to the ultrasonic knife 101 to control the voltage amplitude and the current amplitude of the first voltage signal output by the ultrasonic knife 101, so that the ultrasonic knife 101 outputs the first voltage signal with the first voltage amplitude and the first current amplitude.

[0064] In the ultrasonic scalpel system provided in an embodiment of the present application, when the signal acquisition control signal includes multiple sampling points corresponding to a high-frequency interference signal with zero amplitude, a second ultrasonic scalpel signal carrying the high-frequency interference signal is acquired based on the signal sampling control signal. This can yield a target voltage signal that does not contain the high-frequency interference signal, i.e., a pure ultrasonic scalpel signal can be accurately acquired. Furthermore, based on the target voltage signal, an ultrasonic scalpel control signal can be accurately generated, achieving precise control of the ultrasonic scalpel. This improves the accuracy and safety of surgery.

[0065] At the same time, the ultrasonic knife operating system does not need to perform complex signal processing on the second ultrasonic knife signal carrying the high-frequency interference signal, that is, it does not require a high-performance multi-core processor or large-scale memory resources to support complex algorithm operations, thus reducing the system's dependence on hardware resources. Moreover, the ultrasonic knife operating system only requires a relatively low-configuration controller to achieve stable extraction of ultrasonic knife signals, which not only reduces hardware costs, but also helps to reduce power consumption and extend the device's battery life or service life. Furthermore, the lower hardware resource requirements make the system smaller and simpler in structure, which is conducive to promotion in application scenarios with strict restrictions on device size and complexity, such as portable medical devices, smart sensor nodes, etc., improving the applicability and scalability of the system.

[0066] like Figure 3 As shown in the above Figure 1 Based on the shown embodiment, the signal processing circuit 102 may include a first voltage processing circuit 1021 and a second voltage processing circuit 1022; the input end of the first voltage processing circuit 1021 is the input end of the signal processing circuit 102, and is coupled to the output end of the ultrasonic knife 101; the output end of the first voltage processing circuit 1021 is coupled to the input end of the second voltage processing circuit 1022; the output end of the second voltage processing circuit 1022 is the output end of the signal processing circuit 102, and is coupled to the control input end of the controller 103.

[0067] The first voltage processing circuit 1021 is configured to adjust the amplitude of the first voltage signal carrying the first interference signal to obtain a second voltage signal carrying the second interference signal;

[0068] The second voltage processing circuit 1022 is used to process the second voltage signal carrying the second interference signal to obtain a signal acquisition control signal; and perform signal acquisition on the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain a target voltage signal.

[0069] Exemplarily, the first voltage processing circuit 1021 can include at least one amplitude adjustment circuit. In some examples, the first voltage processing circuit 1021 includes one amplitude adjustment circuit. In other examples, the first voltage processing circuit 1021 includes two amplitude adjustment circuits. In yet other examples, the first voltage processing circuit 1021 can include two amplitude adjustment circuits. The number of amplitude adjustment circuits included in the first voltage processing circuit 1021 is not limited in the embodiments of the present application. The embodiments of the present application exemplarily take the example that the first voltage processing circuit 1021 includes two amplitude adjustment circuits.

[0070] Taking the example that the first voltage processing circuit 1021 includes two amplitude adjustment circuits, one of which is a transformer and the other is a differential operational amplifier, referring to FIG. 4, the first voltage processing circuit 1021 can include a transformer 401 and a differential operational amplifier 402. The input end of the transformer 401 is the input end of the first voltage processing circuit 1021 and is coupled with the output end of the electrosurgical knife 101; the output end of the transformer 401 is coupled with the input end of the differential operational amplifier 402; the output end of the differential operational amplifier 402 is the output end of the first voltage processing circuit 1021 and is coupled with the input end of the second voltage processing circuit 1022. Figure 4

[0071] The transformer 401 is configured to perform amplitude adjustment on the first voltage signal carrying the first interference signal to obtain the amplitude-adjusted first voltage signal carrying the first interference signal; and the differential operational amplifier 402 is configured to perform amplitude adjustment on the amplitude-adjusted first voltage signal carrying the first interference signal to obtain the second voltage signal carrying the second interference signal.

[0072] Since the transformer 401 has the function of voltage transformation, the first voltage signal carrying the first interference signal can be stepped down by the transformer 401 to achieve amplitude adjustment on the first voltage signal carrying the first interference signal, so that the amplitude-adjusted first voltage signal carrying the first interference signal is adapted to the input voltage range requirement of the differential operational amplifier 402. At the same time, since the transformer 401 has the electromagnetic isolation characteristic, the transformer 401 can block the conductive interference path possibly existing between the electrosurgical knife signal and the ultrasonic knife signal to some extent, thereby reducing the influence of the electrosurgical knife signal on the subsequent processing link.

[0073] ​Since the differential operational amplifier 402 can effectively suppress common-mode noise and improve the signal-to-noise ratio of the signal compared to an ordinary operational amplifier, by reasonably setting the amplification factor, bias voltage and other parameters of the differential operational amplifier 402, the voltage amplitude of the first voltage signal carrying the first interference signal after amplitude adjustment can be finely adjusted to ensure that the output second voltage signal carrying the second interference signal has a suitable amplitude range and accuracy to meet the input voltage and accuracy requirements of the second voltage processing circuit 1022.

[0074] In the ultrasonic knife operating system provided in the embodiment of the present application, the amplitude of the first voltage signal carrying the first interference signal is adjusted by the first voltage processing circuit, so that the second voltage signal carrying the second interference signal that meets the voltage input range requirements of the second voltage processing circuit can be obtained; thus, based on the second voltage processing circuit for processing the second voltage signal carrying the second interference signal, a signal acquisition control signal can be obtained; further, when the signal acquisition control signal includes multiple sampling points corresponding to high-frequency interference signals with zero amplitude, the second ultrasonic knife signal carrying the high-frequency interference signal is acquired based on the signal sampling control signal, and a target voltage signal that does not include the high-frequency interference signal can be obtained.

[0075] refer to Figure 5 As shown in the above Figure 3 Based on the illustrated embodiment, the second voltage processing circuit 1022 may include a zero-crossing comparison circuit 501 and a signal acquisition circuit 502; the input end of the zero-crossing comparison circuit 501 is coupled to the input end of the second voltage processing circuit 1022 and coupled to the output end of the first voltage processing circuit 1021; the output end of the zero-crossing comparison circuit 501 is coupled to the control input end of the signal acquisition circuit 502; the signal input end of the signal acquisition circuit 502 is coupled to the output end of the first voltage processing circuit 1021; the signal output end of the signal acquisition circuit 502 is the output end of the second voltage processing circuit 1022 and coupled to the control input end of the controller 103.

[0076] The zero-crossing comparison circuit 501 is used to perform zero-crossing detection on the second voltage signal carrying the second interference signal to obtain a signal acquisition control signal;

[0077] The signal acquisition circuit 502 is configured to acquire the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain a target voltage signal.

[0078] Because multiple sampling moments at which the second interference signal amplitude is zero can be determined based on the signal acquisition control signal, the zero-crossing comparison circuit 501 can first analyze the second voltage signal carrying the second interference signal to obtain the second interference signal, and then perform zero-crossing detection on the second interference signal to obtain the signal acquisition control signal.

[0079] In some examples, the second voltage signal carrying the second interference signal can be filtered by a filter to resolve the second interference signal from the second voltage signal carrying the second interference signal.

[0080] Taking a square wave pulse signal as an example of the signal acquisition control signal. The signal acquisition circuit 502 can start the signal acquisition circuit 502 at the rising edge of the square wave pulse signal, and perform signal acquisition on the second voltage signal carrying the second interference signal when the square wave pulse signal is a logic high level "1". And the signal acquisition circuit 502 can stop the signal acquisition circuit 502 to perform signal acquisition on the second voltage signal carrying the second interference signal at the falling edge of the square wave pulse signal. In this way, the second voltage signal excluding the second interference signal can be obtained, and the second voltage signal excluding the second interference signal is determined as the target voltage signal.

[0081] In the ultrasonic knife control system provided by the embodiment of the present application, the zero-crossing comparison circuit performs zero-crossing detection on the second voltage signal carrying the second interference signal to obtain a signal acquisition control signal; when the signal acquisition control signal includes a plurality of sampling points corresponding to the high-frequency interference signal with a zero amplitude, the signal acquisition circuit performs signal acquisition on the second voltage signal carrying the second interference signal based on the signal acquisition control signal, and the target voltage signal excluding the high-frequency interference signal can be obtained.

[0082] As shown in FIG. 1, Figure 6 Based on the above-mentioned Figure 5 The zero-crossing comparison circuit 501 includes a filter circuit 601 and a zero-crossing comparator 602; the input end of the filter circuit 601 is the input end of the zero-crossing comparison circuit 501, and is coupled with the output end of the first voltage processing circuit 1021; the output end of the filter circuit 601 is coupled with the input end of the zero-crossing comparator 602; the output end of the zero-crossing comparator 602 is the output end of the zero-crossing comparison circuit 501, and is coupled with the control input end of the signal acquisition circuit 502.

[0083] The filter circuit 601 is configured to filter the second voltage signal carrying the second interference signal to obtain the second interference signal.

[0084] The zero-crossing comparator 602 is configured to perform zero-crossing detection on the second interference signal to obtain a signal acquisition control signal.

[0085] The filter circuit 601 can be a filter for filtering the second voltage signal from the second voltage signal carrying the second interference signal. In some examples, the filter circuit 601 can be a low-pass filter.

[0086] As shown in FIG. 1, Figure 7As shown, the filter circuit 601 includes a first resistor R1 and a first capacitor C1; a first end of the first resistor R1 is an input end of the filter circuit 601, and a second end of the first resistor R1 is coupled with an output end of the filter circuit 601; the first capacitor C1 is connected across the output end and a ground end VSS of the filter circuit 601.

[0087] In the ultrasonic knife control system provided by the embodiment of the present application, the second voltage signal carrying the second interference signal is filtered by the filtering circuit, the second interference signal is obtained, and the zero-crossing detection is performed on the second interference signal, so that the multiple time points at which the amplitude of the second interference signal is 0 are obtained, and the signal sampling control signal can be accurately determined based on the multiple time points at which the amplitude of the second interference signal is 0.

[0088] On the basis of the above-mentioned embodiment, the embodiment of the present application provides a signal processing circuit. Figure 8 As shown, the signal processing circuit 80 can include a first voltage processing circuit 801 and a second voltage processing circuit 802; an input end of the first voltage processing circuit 801 is an input end of the signal processing circuit 80; an output end of the first voltage processing circuit 801 is coupled with an input end of the second voltage processing circuit 802; and an output end of the second voltage processing circuit 802 is an output end of the signal processing circuit 80.

[0089] The first voltage processing circuit 801 is configured to perform amplitude adjustment on the first voltage signal carrying the first interference signal to obtain the second voltage signal carrying the second interference signal.

[0090] The second voltage processing circuit 802 is configured to perform processing on the second voltage signal carrying the second interference signal to obtain a signal sampling control signal; and perform signal sampling on the second voltage signal carrying the second interference signal based on the signal sampling control signal to obtain a target voltage signal.

[0091] As shown, on the basis of the above-mentioned embodiment as shown in Figure 9 As shown, on the basis of the above-mentioned embodiment as shown in Figure 8 The second voltage processing circuit 802 can include a zero-crossing comparison circuit 901 and a signal sampling circuit 902; an input end of the zero-crossing comparison circuit 901 is coupled with an input end of the second voltage processing circuit 802; an output end of the zero-crossing comparison circuit 901 is coupled with a control input end of the signal sampling circuit 902; a signal input end of the signal sampling circuit 902 is coupled with an output end of the first voltage processing circuit; and a signal output end of the signal sampling circuit 902 is an output end of the second voltage processing circuit 802.

[0092] The zero-crossing comparison circuit 901 is configured to perform zero-crossing detection on the second voltage signal carrying the second interference signal to obtain the signal sampling control signal.

[0093] The signal acquisition circuit 902 is configured to acquire the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain a target voltage signal.

[0094] like Figure 10 As shown in the above Figure 9 Based on the embodiment shown, the zero-crossing comparison circuit 901 may include a filter circuit 1001 and a zero-crossing comparator 1002; the input end of the filter circuit 1001 is the input end of the zero-crossing comparison circuit 901; the output end of the filter circuit 1001 is coupled to the input end of the zero-crossing comparator 1002; the output end of the zero-crossing comparator 1002 is the output end of the zero-crossing comparison circuit 901;

[0095] The filtering circuit 1001 is configured to filter the second voltage signal carrying the second interference signal to obtain the second interference signal;

[0096] The zero-crossing comparator 1002 is used to perform zero-crossing detection on the second interference signal to obtain a signal acquisition control signal.

[0097] In some examples, the structure of the filter circuit 1001 can be similar to Figure 7 The structure of the filter circuit 601 is the same as that of the embodiment of the present application, and will not be described in detail here.

[0098] On the basis of the above embodiments, an embodiment of the present application further provides an ultrasonic scalpel control method, which can be applied to the above ultrasonic scalpel system.

[0099] Figure 11 This is a flow chart of an ultrasonic knife control method provided in an embodiment of the present application. Figure 11 As shown, the ultrasonic knife control method may include the following steps 1101 to 1103.

[0100] Step 1101: Outputting a first voltage signal carrying a first interference signal to a signal processing circuit via an ultrasonic scalpel in response to a configuration instruction;

[0101] Step 1102: Processing the first voltage signal carrying the first interference signal by a signal processing circuit to obtain a second voltage signal carrying the second interference signal and a signal acquisition control signal; and acquiring the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain a target voltage signal.

[0102] Step 1103: Generate a control signal for the ultrasonic scalpel based on the target voltage signal through a controller, and output the control signal to the ultrasonic scalpel.

[0103] like Figure 12 As shown in the above Figure 11Based on the illustrated embodiment, step 1102 may include the following steps 1201 and 1202 .

[0104] Step 1201: A first voltage processing circuit is used to adjust the amplitude of a first voltage signal carrying a first interference signal to obtain a second voltage signal carrying a second interference signal.

[0105] Step 1202: Process the second voltage signal carrying the second interference signal through the second voltage processing circuit to obtain a signal acquisition control signal; and acquire the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain a target voltage signal.

[0106] like Figure 13 As shown in the above Figure 12 Based on the illustrated embodiment, step 1202 may include the following steps 1301 and 1302 .

[0107] Step 1301: Perform zero-crossing detection on a second voltage signal carrying a second interference signal through a zero-crossing comparison circuit to obtain a signal acquisition control signal;

[0108] Step 1302 : A signal acquisition circuit is used to acquire a second voltage signal carrying a second interference signal based on a signal acquisition control signal to obtain a target voltage signal.

[0109] In some examples, step 1301 may include: filtering the second voltage signal carrying the second interference signal through a filtering circuit to obtain the second interference signal; performing zero-crossing detection on the second interference signal through a zero-crossing comparator to obtain a signal acquisition control signal.

[0110] The basic principles of the present disclosure have been described above in conjunction with specific embodiments. However, the advantages, strengths, and effects mentioned in this disclosure are merely illustrative and not restrictive, and should not be considered as essential to each embodiment of the present disclosure. Furthermore, the specific details disclosed above are provided for illustrative purposes and to facilitate understanding, rather than as limitations. These details do not limit the present disclosure to necessarily being implemented using these specific details.

[0111] Those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. An ultrasonic knife control system, characterized in that: The ultrasonic scalpel control system includes an ultrasonic scalpel, a signal processing circuit, and a controller; the input end of the signal processing circuit is coupled to the output end of the ultrasonic scalpel, the output end of the signal processing circuit is coupled to the control input end of the controller; the control output end of the controller is coupled to the input end of the ultrasonic scalpel; The ultrasonic scalpel is configured to output a first voltage signal carrying a first interference signal to the signal processing circuit in response to a configuration instruction; The signal processing circuit is configured to process the first voltage signal carrying the first interference signal to obtain a second voltage signal carrying the second interference signal and a signal acquisition control signal; and perform signal acquisition on the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain a target voltage signal; The controller is configured to generate a control signal for the ultrasonic scalpel based on the target voltage signal and output the control signal to the ultrasonic scalpel.

2. The ultrasonic scalpel control system according to claim 1, characterized in that: The signal processing circuit includes a first voltage processing circuit and a second voltage processing circuit; the input end of the first voltage processing circuit is the input end of the signal processing circuit; the output end of the first voltage processing circuit is coupled to the input end of the second voltage processing circuit; the output end of the second voltage processing circuit is the output end of the signal processing circuit; The first voltage processing circuit is configured to adjust the amplitude of the first voltage signal carrying the first interference signal to obtain a second voltage signal carrying the second interference signal; The second voltage processing circuit is used to process the second voltage signal carrying the second interference signal to obtain the signal acquisition control signal; Based on the signal acquisition control signal, signal acquisition is performed on the second voltage signal carrying the second interference signal to obtain the target voltage signal.

3. The ultrasonic scalpel control system according to claim 2, characterized in that: The second voltage processing circuit includes a zero-crossing comparison circuit and a signal acquisition circuit; the input end of the zero-crossing comparison circuit is coupled to the input end of the second voltage processing circuit; the output end of the zero-crossing comparison circuit is coupled to the control input end of the signal acquisition circuit; the signal input end of the signal acquisition circuit is coupled to the output end of the first voltage processing circuit; and the signal output end of the signal acquisition circuit is the output end of the second voltage processing circuit. The zero-crossing comparison circuit is used to perform zero-crossing detection on the second voltage signal carrying the second interference signal to obtain the signal acquisition control signal; The signal acquisition circuit is used to acquire the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain the target voltage signal.

4. The ultrasonic scalpel control system according to claim 3, characterized in that: The zero-crossing comparison circuit includes a filter circuit and a zero-crossing comparator; the input end of the filter circuit is the input end of the zero-crossing comparison circuit; the output end of the filter circuit is coupled to the input end of the zero-crossing comparator; the output end of the zero-crossing comparator is the output end of the zero-crossing comparison circuit; The filtering circuit is configured to filter the second voltage signal carrying the second interference signal to obtain the second interference signal; The zero-crossing comparator is used to perform zero-crossing detection on the second interference signal to obtain the signal acquisition control signal.

5. The ultrasonic scalpel control system according to claim 4, characterized in that: The filtering circuit includes a first resistor and a first capacitor; the first end of the first resistor is the input end of the filtering circuit, and the second end of the first resistor is coupled to the output end of the filtering circuit; the first capacitor is connected between the output end of the filtering circuit and the ground end.

6. The ultrasonic scalpel control system according to any one of claims 1 to 5, characterized in that: The first voltage signal includes an ultrasonic knife signal of a first frequency; the first interference signal includes an ultrasonic knife signal of a second frequency output by the electric knife; and the first frequency is less than the second frequency.

7. The ultrasonic scalpel control system according to any one of claims 1 to 5, characterized in that: The signal acquisition control signal is a pulse signal; when the pulse signal changes from the second level to the first level, the signal processing circuit starts signal acquisition of the second voltage signal carrying the second interference signal; when the pulse signal changes from the first level to the second level, the signal processing circuit stops signal acquisition of the second voltage signal carrying the second interference signal.

8. A signal processing circuit, characterized in that: The signal processing circuit includes a first voltage processing circuit and a second voltage processing circuit; the input end of the first voltage processing circuit is the input end of the signal processing circuit; the output end of the first voltage processing circuit is coupled to the input end of the second voltage processing circuit; the output end of the second voltage processing circuit is the output end of the signal processing circuit; The first voltage processing circuit is configured to adjust the amplitude of the first voltage signal carrying the first interference signal to obtain a second voltage signal carrying the second interference signal; The second voltage processing circuit is used to process the second voltage signal carrying the second interference signal to obtain a signal acquisition control signal; and based on the signal acquisition control signal, perform signal acquisition on the second voltage signal carrying the second interference signal to obtain a target voltage signal.

9. The signal processing circuit according to claim 8, wherein: The second voltage processing circuit includes a zero-crossing comparison circuit and a signal acquisition circuit; the input end of the zero-crossing comparison circuit is coupled to the input end of the second voltage processing circuit; the output end of the zero-crossing comparison circuit is coupled to the control input end of the signal acquisition circuit; the signal input end of the signal acquisition circuit is coupled to the output end of the first voltage processing circuit; and the signal output end of the signal acquisition circuit is the output end of the second voltage processing circuit. The zero-crossing comparison circuit is used to perform zero-crossing detection on the second voltage signal carrying the second interference signal to obtain the signal acquisition control signal; The signal acquisition circuit is used to acquire the second voltage signal carrying the second interference signal based on the signal acquisition control signal to obtain the target voltage signal.

10. The signal processing circuit according to claim 9, wherein: The zero-crossing comparison circuit includes a filter circuit and a zero-crossing comparator; the input end of the filter circuit is the input end of the zero-crossing comparison circuit; the output end of the filter circuit is coupled to the input end of the zero-crossing comparator; the output end of the zero-crossing comparator is the output end of the zero-crossing comparison circuit; The filtering circuit is configured to filter the second voltage signal carrying the second interference signal to obtain the second interference signal; The zero-crossing comparator is used to perform zero-crossing detection on the second interference signal to obtain the signal acquisition control signal.

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