Ultrasound generator control method, ultrasound generator, storage medium and computer

Abstract

The application provides an ultrasonic generator control method, an ultrasonic generator, a storage medium and a computer, which obtains a second output target according to a preset rule when the ultrasonic generator meets a constant power mode switching condition, and adjusts an output state according to the second output target. When the power output of the power supply is limited, the output state is adaptively adjusted according to the slight shift characteristics of the resonance state caused by the actual load characteristics, the shifted resonance point is tracked based on the trackable parameters, the output efficiency is increased, and the active power is improved. By dynamically adjusting the output target, the output state can be adjusted according to the change of the load, the degree of reduction of the output efficiency caused by the slight shift of the resonance point caused by the load is reduced, the degree of reduction of the active power caused by the load is reduced, the cutting effect of the ultrasonic scalpel is ensured, and the operation effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to an ultrasonic generator control method, an ultrasonic generator, a storage medium and a computer. BACKGROUND

[0002] An ultrasonic scalpel is a medical device that uses high-frequency ultrasonic waves to cut and coagulate tissue. Its core principle is to convert electrical energy into mechanical vibration through a piezoelectric ceramic transducer, generating high-frequency ultrasonic waves of about 55.5 kHz, causing the blade to vibrate at a micro-amplitude of about 50-100 μm, and decomposing tissue through selective thermal and cavitation effects, while achieving precise cutting and coagulation.

[0003] Ultrasonic scalpel systems usually use phase-locked frequency tracking technology to control the phase difference between the output voltage and output current of the power supply, so that the frequency of the output driving signal is consistent with the mechanical resonance frequency (fs) of the ultrasonic scalpel, to ensure the conversion efficiency of electrical energy into mechanical vibration. In an ideal state, when the system works at the resonance point, the output amplitude is maximum and the cutting efficiency is optimal. In the prior art, various improvement schemes aim to improve the accuracy and speed of phase-locked frequency tracking, such as using dynamic parameter calculation or intelligent algorithms to better track and lock the resonance point fs, so as to maintain stable output and effective cutting when the system power is not at the upper limit.

[0004] However, the inventors have found through in-depth research that although the prior art has made progress in resonance point tracking, it still has a fundamental limitation: the control target is always to find and lock the mechanical resonance point (fs) in order to obtain the maximum output amplitude. This strategy is effective when the system output power is not at the upper limit, but when cutting thick or dense tissue, the total output power of the ultrasonic generator reaches the upper limit, and the system has to enter the constant power mode. In this power saturation state, continuing to pursue the resonance point fs will result in a low proportion of active power in the system output, and a large amount of power will be dissipated in the reactive component, so that the actual mechanical energy obtained by the blade is insufficient, the cutting speed decreases, and the demand for efficient surgery cannot be met. More importantly, since the interaction between the scalpel and the cut tissue dynamically changes the load characteristics, causing the resonance point to shift slightly, the existing scheme is difficult to further optimize the energy conversion efficiency in the constant power mode.

[0005] Therefore, there is an urgent need in the art for a method that can adaptively find and lock the system's optimal energy conversion efficiency point (such as the second resonance frequency fm) in the constant power mode to output the maximum active power. This is not a simple frequency tracking problem, but a new problem involving power adaptive control strategy switching: how to automatically switch from "pursuing maximum amplitude (constant current mode)" to "pursuing maximum efficiency (constant power mode)" by monitoring the power state, so as to solve the problem of insufficient active power output efficiency in the power saturation state. SUMMARY

[0006] The present application aims to solve the fundamental problem pointed out in the background: the existing ultrasonic generator still takes the mechanical resonance frequency fs as the control target in constant power mode, resulting in insufficient active power output efficiency and failing to meet the high load cutting demand.

[0007] To solve this problem, the present application conducts theoretical analysis and simulation research based on the equivalent circuit model of the ultrasonic scalpel. It is found that when the system output power reaches the upper limit, the optimal working point in theory is not the mechanical resonance point fs, but a maximum energy conversion efficiency point (corresponding to the frequency fm), at which the maximum active power output in constant power mode can be achieved. However, this frequency fm is affected by the dynamic load and cannot be directly measured and tracked.

[0008] The core creation of the present application lies in the discovery that the above-mentioned maximum efficiency point fm corresponds to a specific voltage-current phase angle a, and this phase angle a is not unknown, but has a definite mathematical relationship with the static parameters (L0, C0) of the system and the operating parameters (resonant frequency fs, voltage U, current I) easily obtained in constant current mode. Based on this discovery, the control strategy in constant power mode is completely changed, and a new method of tracking the target phase angle a calculated instead of the traditional zero phase angle is proposed, thereby indirectly and accurately making the system work near the maximum efficiency point fm.

[0009] Therefore, the purpose of the present application is to provide an ultrasonic generator control method to effectively solve the problem of low active power output efficiency caused by improper control target in constant power mode through the above-mentioned innovative strategy, thereby guaranteeing the cutting effect of the ultrasonic scalpel under high load working conditions.

[0010] In one aspect, the present application provides an ultrasonic generator control method, comprising:

[0011] When the ultrasonic generator is in constant current mode, the output state is regulated according to a preset first output target;

[0012] The working condition of the ultrasonic generator is monitored, and when it is determined that the preset constant power mode switching condition is met according to the working condition of the ultrasonic generator, the constant power mode is switched to;

[0013] When the ultrasonic generator is in constant power mode, a second output target is obtained according to a preset rule, and the output state is regulated according to the second output target, wherein the output efficiency of the second output target is greater than that of the first output target in the constant power mode.

[0014] Optionally, the step of obtaining the second output target according to the preset rule comprises:

[0015] searching a target output frequency of the ultrasonic generator according to the preset rule, and adjusting a current output frequency of the constant power mode to the target output frequency, the target output frequency being an output frequency corresponding to a maximum output efficiency of the ultrasonic generator;

[0016] wherein the preset rule is to search the target output frequency of the ultrasonic generator by adjusting the output frequency of the constant power mode to make a measured phase angle of the ultrasonic generator approach a target phase angle, the target phase angle being calculated according to a preset formula.

[0017] Optionally, the step of adjusting the output frequency of the constant power mode to make the measured phase angle of the ultrasonic generator approach the target phase angle comprises:

[0018] calculating a target phase angle of the ultrasonic generator according to the preset formula, and judging whether the measured phase angle of the ultrasonic generator approaches the target phase angle;

[0019] if not, adjusting the output frequency of the constant power mode according to a preset frequency adjustment rule, and returning to execute the step of calculating the target phase angle of the ultrasonic generator according to the preset formula, and judging whether the measured phase angle of the ultrasonic generator approaches the target phase angle;

[0020] if yes, outputting the current output frequency of the constant power mode to search the target output frequency of the ultrasonic generator.

[0021] Optionally, the preset formula is:

[0022] ;

[0023] wherein a is the target phase angle, arctan is an inverse tangent calculation formula, U is a power output voltage at a first resonance frequency, I is a power output current at the first resonance frequency, π is a circular constant, fs is the first resonance frequency in the first output target, C0 is a parallel equivalent capacitance value of the target ultrasonic generator, and L0 is a parallel equivalent inductance value of the target ultrasonic generator.

[0024] Optionally, further comprising: switching a working mode of the ultrasonic generator to the constant power mode when a preset constant power mode switching condition is met.

[0025] Optionally, the constant power mode switching condition comprises at least one of the current power of the ultrasonic generator being greater than or equal to a power threshold, the current current of the ultrasonic generator exceeding a current threshold, and the current voltage of the ultrasonic generator exceeding a voltage threshold.

[0026] Optionally, further comprising:

[0027] When the ultrasonic generator is started, the working mode of the ultrasonic generator is set to the constant current mode, and it is determined whether the constant power mode switching condition is met at present.

[0028] Another aspect of the present application provides an ultrasonic generator for an ultrasonic scalpel, the ultrasonic generator comprising:

[0029] a collection module configured to collect working conditions of the ultrasonic generator;

[0030] a main controller configured to control a working mode of the ultrasonic generator, the working mode comprising a constant current mode and a constant power mode;

[0031] a phase-locked frequency tracking module configured to regulate output voltage, output current and output frequency of the ultrasonic generator according to a phase-locked frequency tracking target;

[0032] The main controller is further configured to regulate the working state of the ultrasonic generator according to the ultrasonic generator control method.

[0033] Optionally, the phase-locked frequency tracking target of the phase-locked frequency tracking module comprises a phase angle, and the initial phase angle is zero.

[0034] Another aspect of the present application provides an ultrasonic generator for an ultrasonic scalpel, the ultrasonic generator comprising a main controller configured to regulate the working state of the ultrasonic generator according to the ultrasonic generator control method.

[0035] The present application further provides a storage medium, which is a computer readable storage medium and stores a computer program, the computer program being configured to execute the ultrasonic generator control method when read and run.

[0036] The present application further provides a computer, which stores a computer program, the computer program being configured to execute the ultrasonic generator control method when read and run.

[0037] The ultrasonic generator control method provided by the present application switches to the constant power mode when the constant power mode switching condition is met in the constant current mode, and obtains a second output target according to a preset rule and regulates the output state according to the second output target in the constant power mode, so as to increase the output efficiency. When the output efficiency is reduced due to the influence of the load, the output target can be dynamically adjusted to increase the output efficiency, reduce the degree of reduction of the output efficiency caused by the slight shift of the resonance point caused by the load, and ensure the cutting effect of the ultrasonic scalpel and improve the surgical effect. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1The main flow chart of the ultrasonic generator control method in the embodiment of the application;

[0039] Figure 2 The equivalent circuit diagram of the ultrasonic generator in the embodiment of the application;

[0040] Figure 3 The main module structure schematic diagram of the ultrasonic generator in the embodiment of the application;

[0041] Figure 4 The flow chart of the ultrasonic generator control method provided by the embodiment of the application.

[0042] The following specific embodiments will further illustrate the application in combination with the above-mentioned drawings. DETAILED DESCRIPTION

[0043] In order to facilitate the understanding of the application, the application will be described more fully below with reference to the accompanying drawings. The application is shown in several embodiments in the drawings. However, the application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the application more thorough and comprehensive.

[0044] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely used for the purpose of illustration.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] In actual application, the prior art produces interaction between the ultrasonic scalpel and the cut tissue, which changes the load characteristics of the blade head, causes the resonance state to deviate, and reduces the proportion of active power actually acting on the load in the phase-locked frequency-fixed working state, resulting in that the working efficiency in actual cutting of the ultrasonic scalpel is lower than the ideal efficiency, which reduces the surgical effect. Moreover, when different tissues are cut and the state of the cut tissue changes, the load characteristics also change, causing dynamic deviation of the resonance state of the system, which is difficult to standardize and quantize.

[0047] To solve the problems in the prior art, the application provides an ultrasonic generator control method, as shown in the accompanying drawings, mainly comprising: Figure 1

[0048] Step S01: When the ultrasonic generator is in a constant current mode, the output state is regulated according to a preset first output target;

[0049] Step S02: The working condition of the ultrasonic generator is monitored, and when it is determined that a preset constant power mode switching condition is met according to the working condition of the ultrasonic generator, the constant power mode is switched to;

[0050] Step S03: When the ultrasonic generator is in the constant power mode, a second output target is obtained according to a preset rule, and the output state is regulated according to the second output target, wherein in the constant power mode, the output efficiency of the second output target is greater than the output efficiency of the first output target.

[0051] In step S03, the target output frequency of the ultrasonic generator is searched according to the preset rule, and the current output frequency of the constant power mode is adjusted to the target output frequency, and the target output frequency is the output frequency corresponding to the maximum output efficiency of the ultrasonic generator.

[0052] In step S03, the target output frequency of the ultrasonic generator is searched according to the preset rule, and the current output frequency of the constant power mode is adjusted to the target output frequency, and the target output frequency is the output frequency corresponding to the maximum output efficiency of the ultrasonic generator.

[0053] In step S03, the target output frequency of the ultrasonic generator is searched according to the preset rule, and the current output frequency of the constant power mode is adjusted to the target output frequency, and the target output frequency is the output frequency corresponding to the maximum output efficiency of the ultrasonic generator. Figure 2 As shown in the accompanying drawings, it is an equivalent model of an ultrasonic scalpel, wherein S is a power supply of a host, L0 is a parallel equivalent inductance, C0 is a parallel equivalent capacitance, Lm is a series equivalent inductance, Cm is a series equivalent capacitance, and Rm is a dynamic load of a cut tissue.

[0054] Based on the theoretical analysis and simulation research on the equivalent circuit model, the inventors find that there is a theoretical maximum energy conversion efficiency point (corresponding to the second resonance frequency fm) in the system, and the maximum active power output under constant power can be obtained at the point. However, the frequency fm cannot be directly measured and tracked due to the influence of the dynamic load (Lm, Cm, Rm).

[0055] The key discovery of the application is that the above-mentioned maximum efficiency point fm corresponds to a specific voltage and current phase angle a, and the phase angle a is not unknown, and there is a certain mathematical relationship between the phase angle a and the static parameters (L0, C0) of the system and the operating parameters (resonance frequency fs, voltage U, current I) obtained under the constant current mode.

[0056] ​Through theoretical derivation, the target phase angle α can be calculated and determined using the following preset formula and the corresponding inverse trigonometric function:

[0057] ;Formula (1)

[0058] Where, a is the target phase angle, which is calculated from the value of tan(a) and a = arctan[tan(a)], where arctan() is the arctangent function; π is pi; fs is the first resonant frequency determined by phase-locked loop frequency tracking under constant current mode; C0 is the parallel equivalent capacitance value of the ultrasonic transducer (static parameter, which can be pre-calibrated); L0 is the parallel inductance value matched with C0 (static parameter, which can be pre-calibrated); U is the power supply output voltage at the first resonant frequency (operating parameter, which can be measured in real time); and I is the power supply output current at the first resonant frequency (operating parameter, which can be measured in real time).

[0059] The theoretical basis of this formula lies in the fact that at the point of maximum efficiency fm, the equivalent reactance of the dynamic series resonant circuit (Lm-Cm-Rm) is zero, and its impedance is purely resistive. At this time, the total phase difference of the system is determined by the equivalent susceptance of the static parallel circuit (L0-C0), thus deriving the above mathematical relationship.

[0060] The engineering significance of this formula lies in its transformation of an optimal control objective (frequency fm) that cannot be directly measured into a control objective (phase angle α) that can be precisely calculated using known quantities. This provides a unique and feasible implementation path for subsequently tracking this phase angle using phase-locked loop (PLL) technology, thereby indirectly stabilizing the system to operate near its maximum efficiency point.

[0061] It should be noted that the "maximum energy conversion efficiency point (fm)" mentioned in this paper is a theoretical optimum derived from an equivalent circuit model. In practical applications, especially under dynamic load conditions, the essence of the method described in this invention lies in tracking the target phase angle α (which can be directly obtained based on theory and available data) to make the system operate near this theoretical optimum, thereby achieving significant optimization and stabilization of active power output efficiency.

[0062] In practical applications, the parameter range of the equivalent model is: L0∈(1.6mH, 2.4mH), C0∈(3.28nF, 4.92nF), Lm∈(0.3H, 1.5H), Cm∈(6pF, 30pF), Rm∈(50Ω, 500Ω). Based on this, frequency sweep simulation tests (simulation under ideal conditions) are carried out, and some of the test results are shown in Tables 1, 2, 3, 4 and 5.

[0063] Table 1:

[0064]

[0065] Table 2:

[0066]

[0067] Table 3:

[0068]

[0069] Table 4:

[0070]

[0071] Table 5:

[0072]

[0073] wherein f0 is a static resonance point frequency, fs is a first resonance frequency obtained by phase-locked frequency pursuit when reaching the maximum current in constant current mode, fm is a second resonance frequency obtained based on dynamic equivalent parameters, Y0 is a parallel equivalent susceptance of L0 and C0, a constraint condition of which is |Y0| maximum < 1 / 1370S≈0.000729927 (S is the unit of conductance, susceptance and admittance), Xm is a series equivalent reactance of Lm and Cm, Bm is an equivalent susceptance jBm of jXm and Rm in series to parallel conversion, G is an equivalent conductance of jXm and Rm in series to parallel conversion, j is a complex number, and K is an output efficiency (a proportion of active power).

[0074] wherein a theoretical formula of K is:

[0075] ;

[0076] Since Xm is a dynamic parameter, Rm is related to the cut tissue, and it is difficult to directly solve a fixed value.

[0077] According to Table 1, the output efficiency at the second resonance frequency fm is significantly greater than the output efficiency at the first resonance frequency fs, and the difference with the maximum efficiency is small. Since the maximum efficiency point is difficult to directly solve, the second resonance frequency fm is taken as a control target in the application. According to Table 1, Table 2, under the condition that L0\C0 has no deviation, the change of dynamic load Rm has no obvious influence on the resonance frequency point, and the resonance frequency point has no deviation. According to Table 1, Table 3, Table 4 and Table 5, the main influencing factor of the resonance frequency point deviation is L0 and C0, and the resonance frequency point deviation amount brought by Lm and Cm is extremely small.

[0078] In the above test, the difference between the second resonance frequency fm and the first resonance frequency fs is extremely small, which is difficult to realize by frequency regulation. Further, the applicant has also found that there is a phase difference between the voltage and the current of the power supply at the second resonance frequency fm, and through phasor analysis, the phase difference (target phase angle a) satisfies formula (2):

[0079] ;

[0080] At the second resonance frequency fm, Xm=0, Rm=U / I, Y0=2*Π*fs*C0-1 / (2*Π*fs*L0), substituting into tan(a) formula, formula (1) is obtained:

[0081] ;

[0082] Formula (1) is solved by inverse tangent a=arctan[tan(a)] to obtain the target phase angle a, wherein U is the output voltage of the power supply at the first resonance frequency, I is the output current of the power supply at the first resonance frequency, fs can be obtained by phase-locked frequency tracking in constant current mode, the phase-locked angle in phase-locked frequency tracking in constant current mode is 0, C0 and L0 are system fixed parameters, which are fixed values after hardware design is completed, and considering the deviation caused by machining tolerance, the actual value can be tested and calibrated by the equipment manufacturer.

[0083] The step of adjusting the output frequency of the constant power mode to make the measured phase angle of the ultrasonic generator approach the target phase angle comprises:

[0084] calculating the target phase angle of the current ultrasonic generator by the preset formula, and determining whether the measured phase angle of the current ultrasonic generator approaches the target phase angle;

[0085] If not, adjust the output frequency of the constant power mode according to the preset frequency adjustment rule, and return to execute the step of calculating the target phase angle of the current ultrasonic generator by the preset formula, and determining whether the measured phase angle of the current ultrasonic generator approaches the target phase angle;

[0086] If yes, output the current output frequency of the constant power mode to search for the target output frequency of the ultrasonic generator.

[0087] In an optional embodiment, the step of adjusting the output frequency of the constant power mode to make the measured phase angle of the ultrasonic generator approach the target phase angle is realized by phase-locked frequency tracking, in which closed-loop control can be performed by a PID (proportional-integral-derivative) controller or the like, which obtains the real-time phase angle of the output voltage and the output current according to the phase information of the output voltage and the output current of the power supply, and obtains the real-time difference between the real-time phase angle and the target phase, adjusts the output frequency according to the real-time difference, until the real-time difference is eliminated, and the control reliability is guaranteed.

[0088] According to different working states, the ultrasonic scalpel often has multiple working modes, and the output efficiency control is mainly applied in the constant power mode. To ensure the effectiveness of the control operation according to the target phase angle, the control operation further includes: when a preset constant power mode switching condition is met, the working mode of the ultrasonic generator is switched to the constant power mode, which can avoid the interference of the phase angle control misstart on the original working mode and ensure the working efficiency of each working mode.

[0089] Specifically, the constant power mode switching condition at least includes that the current power of the ultrasonic generator is greater than or equal to a power threshold value, and the power threshold value is usually a safety threshold value. When the current power is greater than the power threshold value, the output power is limited within a safe range, and safety accidents are avoided, thereby improving the safety of the operation.

[0090] To avoid damage to the electronic equipment by large current, the constant power mode switching condition further includes that the current exceeds a current threshold value or the current voltage exceeds a voltage threshold value, and the current threshold value and the voltage threshold value are corresponding safety threshold values and are pre-calibrated.

[0091] To improve the starting speed of the ultrasonic generator, in the embodiment, the working mode of the ultrasonic generator is set to the constant current mode when the ultrasonic generator is started, and it is judged whether the constant power mode switching condition is met. In the constant current mode, the driving current is large, and the ultrasonic generator can be started quickly, and the system state is detected to judge whether the constant power mode switching condition is met, so as to switch to the constant power mode in time when the starting power is too large, thereby ensuring the safety while taking into account the starting speed.

[0092] In the constant current mode, the active power is mainly affected by the total output power, and at this time the resonance point is located at the first resonance frequency fs. To improve the output efficiency in the constant current mode, in the embodiment, after the step of setting the working mode of the ultrasonic generator to the constant current mode when the ultrasonic generator is started, the output frequency of the ultrasonic generator is locked to the first resonance frequency through a phase-locked loop, and the first resonance frequency is obtained through fixed parameters of the system and is a preset value.

[0093] To determine the mode switching time, in the embodiment, the working condition of the ultrasonic generator is monitored, and when the current working condition meets the preset constant power mode switching condition, the working mode of the ultrasonic generator is switched to the constant power mode.

[0094] The information corresponding to the working condition of the ultrasonic generator includes the real-time output current, the real-time output power, the real-time output voltage and the real-time output frequency of the power supply.

[0095] As a specific example, in the embodiment, the constant power mode switching condition includes: the real-time output current reaches a preset maximum current threshold, and the real-time output power exceeds a preset maximum power threshold. The maximum current threshold and the maximum power threshold are usually safety thresholds and can be obtained from a device parameter manual.

[0096] To facilitate the quick start of the ultrasonic scalpel, in the embodiment, the ultrasonic generator is first started in the constant current mode, and the working condition of the ultrasonic generator is monitored, and when the current working condition meets the preset constant power mode switching condition, the constant power mode is switched to.

[0097] The target phase angle a can be determined in advance in the constant current mode, so that when the constant power mode is switched to, a quick response can be achieved, the stability of the effective output power is improved, the stability of the cutting effect in the operation is improved, and the operation effect is improved. The demand for system computing resources is small, the modification cost is low, the power output voltage at the first resonant frequency, the power output current at the first resonant frequency, and the first resonant frequency are easy to obtain, the data accuracy is high, and the reliability and effectiveness of the control are guaranteed.

[0098] In a specific example, as shown in Figure 4 After the ultrasonic scalpel is started, the main controller first performs self-checking to confirm that its performance is normal, and performs data interaction with the transducer and the main machine to obtain the parameter C0 of the parallel equivalent capacitor from the transducer side and the parameter L0 of the parallel energy efficiency inductor from the main machine side, and after confirmation, the cutting can be started. The process does not take long, and the preparation time before cutting is sufficient to ensure that the cutting is completed. In actual application, for example, the surgeon can be reminded by sound to ensure the effectiveness of the implementation of the control scheme of the application.

[0099] When the cutting is started, it is first operated in the constant current mode. In the constant current mode, the first resonant frequency fs (the resonant frequency when the current threshold is reached in the constant current mode) is obtained according to the phase-locked frequency tracking, and the output voltage U and the output current I at this time are obtained. After confirmation, the tangent value tan (a) of the target phase angle is calculated in advance according to formula (2).

[0100] When the current threshold is reached in the constant current mode, it is judged that the constant current mode switching condition is met, and the constant power mode is switched to. In the constant power mode, it is judged whether the current power P reaches the power threshold Pmax.

[0101] When the current power P reaches the power threshold Pmax, the target phase angle a is calculated according to the tangent value tan(a) and the arctangent function, and the phase shift is started, and the target phase angle a is taken as the phase-locked frequency tracking target until the phase shift is completed and the working state is fixed; when the current power P does not reach the power threshold Pmax, it is directly determined that the phase shift is completed, and the working target of the phase-locked frequency tracking is fixed.

[0102] Through the regulation of the present application, the active power of the ultrasonic surgical knife working under the current load state can be maximized, the influence of the load leading to the resonance state deviation and then leading to the actual active power reduction is reduced, the cutting efficiency under various working states is guaranteed, and the surgical effect is improved.

[0103] According to the data in Tables 1 to 5, the output efficiency at the second resonance frequency fm is not the maximum, and the difference between the maximum output efficiency is small, that is, the maximum efficiency in the present application mainly refers to the output efficiency at the second resonance frequency fm point which can be effectively regulated. The target phase angle a can be determined in advance in the constant current mode, so in actual application, after the phase-locked frequency tracking to the second resonance frequency, there is still a certain operation space, which can be combined with other artificial intelligence regulation methods to further improve the output efficiency, that is, the ultrasonic generator control method of the present application also has good embeddability and wide application range.

[0104] The present application also provides an ultrasonic generator for an ultrasonic surgical knife, as shown in the accompanying drawings, the ultrasonic generator comprises: Figure 3 As shown in the accompanying drawings, the ultrasonic generator comprises:

[0105] The acquisition module 21 is used for acquiring the working conditions of the ultrasonic generator 10, including the power supply voltage, current, output frequency and the like of the ultrasonic generator 10;

[0106] The main controller 22 is used for controlling the working mode of the ultrasonic generator 10, and the working mode at least includes the constant power mode in the constant current mode and the constant power mode, and the working state of the ultrasonic generator is regulated according to the working conditions of the ultrasonic generator;

[0107] The phase-locked frequency tracking module 23 is used for regulating the output voltage, output current and output frequency of the ultrasonic generator according to the phase-locked frequency tracking target;

[0108] The main controller 22 is also used for obtaining the target phase angle a according to the ultrasonic generator control method, and providing the target phase angle a to the phase-locked frequency tracking module 23 to adjust the phase-locked frequency tracking target, and then adjust the output efficiency of the ultrasonic generator.

[0109] The phase-locked frequency tracking module 23 is further configured to update the initial phase angle to the target phase angle when the target phase angle is obtained, wherein the initial phase angle is zero.

[0110] The application further provides a storage medium, which is a computer readable storage medium and stores a computer program.

[0111] The application further provides a computer, which stores a computer program.

[0112] Those skilled in the art can understand that the logic or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequence list of executable instructions for implementing the logic function, which can be specifically implemented in any computer readable storage medium for use by or in combination with an instruction execution system, device or equipment (such as a computer-based system, a system including a processor or other system that can fetch and execute instructions from the instruction execution system, device or equipment). For the present specification, the "computer readable storage medium" can be any device that can contain, store, communicate, propagate or transport a program for use by or in combination with the instruction execution system, device or equipment.

[0113] More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: an electrical connection having one or more wires (electronic devices), a portable computer diskette (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CD ROM). In addition, the computer readable storage medium can even be paper or other suitable medium on which the program can be printed, because the program can be electronically obtained, for example, by optical scanning of the paper or other medium, followed by editing, interpreting or otherwise processing, if necessary, in other suitable ways, to be electronically obtained and then stored in the computer memory.

[0114] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the embodiments described above, various steps or methods can be implemented, for example, in software or firmware that is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and in another embodiment, any of the following techniques can be used to implement the hardware used to implement the described functions: discrete logic circuitry having logic gates for implementing logic functions upon data signals, application specific integrated circuits having logic gates for implementing the logic functions on data signals, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and the like.

[0115] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0116] The above-described embodiments only express several specific embodiments of the application, which are described in detail and specifically, but cannot be understood as a limitation on the protection scope of the application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the application, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. An ultrasonic generator for an ultrasonic scalpel, characterized by, The ultrasonic generator comprises: a collection module configured to collect working conditions of the ultrasonic generator; a main controller connected to the collection module and configured to control a working mode of the ultrasonic generator, the working mode comprising a constant current mode and a constant power mode, and to regulate a working state of the ultrasonic generator according to the working conditions of the ultrasonic generator; a phase-locked frequency tracking module connected to the main controller and configured to regulate output voltage, output current and output frequency of the ultrasonic generator according to a phase-locked frequency tracking target; wherein the main controller is further configured to: when the ultrasonic generator is in the constant current mode, regulate the phase-locked frequency tracking target of the phase-locked frequency tracking module according to a preset first output target, so as to regulate the output state of the ultrasonic generator; when the working conditions meet a preset constant power mode switching condition, switch the ultrasonic generator to the constant power mode; when the ultrasonic generator is in the constant power mode, obtain a second output target according to a preset rule, so as to regulate the phase-locked frequency tracking target of the phase-locked frequency tracking module according to the second output target, wherein the second output target comprises a target phase angle of the phase-locked frequency tracking target, and the output efficiency of the second output target is greater than that of the first output target in the constant power mode; the main controller is further configured to: calculate the target phase angle through a preset formula, and make the measured phase angle of the ultrasonic generator approach the target phase angle by adjusting the output frequency of the constant power mode, the preset formula comprising: ； wherein a is the target phase angle, arctan is an inverse tangent calculation formula, U is the output voltage of the power supply at the first resonant frequency, I is the output current of the power supply at the first resonant frequency, π is a circular constant, fs is the first resonant frequency in the first output target, C0 is the static parallel equivalent capacitance value of the target ultrasonic generator, and L0 is the parallel equivalent inductance value of the target ultrasonic generator.

2. The ultrasonic generator of claim 1, wherein, the main controller is further configured: to calculate the target phase angle of the ultrasonic generator through the preset formula, and to determine whether the measured phase angle of the ultrasonic generator approaches the target phase angle; if not, to adjust the output frequency of the constant power mode according to a preset frequency adjustment rule, and to return to the step of calculating the target phase angle of the ultrasonic generator through the preset formula and determining whether the measured phase angle of the ultrasonic generator approaches the target phase angle; if yes, to take the current output frequency of the constant power mode as the target output frequency corresponding to the second output target.

3. The ultrasonic generator of claim 1, wherein, The constant power mode switching condition comprises at least one of the following: the current power of the ultrasonic generator is greater than or equal to a power threshold value, the current current of the ultrasonic generator exceeds a current threshold value, and the current voltage of the ultrasonic generator exceeds a voltage threshold value.

4. The ultrasonic generator of claim 1, wherein, the main controller is further configured to: when the ultrasonic generator is started, set the working mode of the ultrasonic generator to the constant current mode, and determine whether the constant power mode switching condition is met at present.

5. The ultrasonic generator of claim 4, wherein, The phase-locked frequency tracking target of the phase-locked frequency tracking module comprises a phase angle, and the initial phase angle is zero.

6. A storage medium, characterized by The storage medium is a computer readable storage medium, and stores a computer program. The computer program, when read and executed, is used to realize the functional configuration of the ultrasonic generator according to any one of claims 1 to 5.

7. A computer, characterized in that The computer stores a computer program. The computer program, when read and executed, is used to realize the functional configuration of the ultrasonic generator according to any one of claims 1 to 5.

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