CN115429389A - Ultrasonic scalpel system phase locking method and ultrasonic scalpel system - Google Patents

Ultrasonic scalpel system phase locking method and ultrasonic scalpel system Download PDF

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CN115429389A
CN115429389A CN202111075013.1A CN202111075013A CN115429389A CN 115429389 A CN115429389 A CN 115429389A CN 202111075013 A CN202111075013 A CN 202111075013A CN 115429389 A CN115429389 A CN 115429389A
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voltage
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李阳
骆威
王福源
刘振中
韦大纶
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Innolcon Medical Technology Suzhou Co Ltd
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    • A61B17/32—Surgical cutting instruments
    • A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
    • A—HUMAN NECESSITIES
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    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/32—Surgical cutting instruments
    • A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
    • A61B2017/320069—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic for ablating tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
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    • A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
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Abstract

The invention provides an ultrasonic knife system phase locking method and an ultrasonic knife system, wherein the ultrasonic knife system comprises an ultrasonic knife, a transducer and a generator which are connected, and the method comprises the following steps: the generator generates an initial current signal and sends the initial current signal to the transducer as a current working signal of the ultrasonic knife; measuring to obtain a voltage value and a current value of a trunk circuit in the equivalent circuit of the ultrasonic knife; calculating the voltage effective value, the current effective value and the voltage-current phase difference of the trunk circuit; calculating the voltage value, the current value and the voltage-current phase difference of the second branch circuit; and the control generator generates a current signal under a new frequency as a current working signal of the ultrasonic knife, and sends the current signal to the transducer to drive the ultrasonic knife to work, and the current signal is circularly carried out. Compared with the traditional method that the ultrasonic equipment needs to be provided with the tuning inductor matched with the traditional ultrasonic equipment according to the frequency required by the system, the phase locking method of the ultrasonic system does not need to limit the ultrasonic frequency, and has good universality.

Description

Phase locking method for ultrasonic scalpel system and ultrasonic scalpel system
Technical Field
The invention relates to the technical field of ultrasonic knives, in particular to a phase locking method of an ultrasonic knife system and the ultrasonic knife system.
Background
An ultrasonic scalpel is a surgical instrument widely used in surgical operations for tissue cutting and coagulation hemostasis, and is implemented by converting an electrical signal into an ultrasonic signal through a transducer, transmitting the ultrasonic signal to a knife tip, generating high-frequency vibration (for example, 55500 times) at the knife tip, denaturing protein in tissue at the knife tip to form a viscous coagulum, and forming a hemostasis seal through the coagulum. The precision of cutting and coagulation is controlled by the surgeon's skill and adjustments to power level, blade edge, tissue traction, and blade pressure.
The ultrasonic scalpel system mainly comprises a generator, a transducer and an ultrasonic scalpel head, and as shown in fig. 1, the ultrasonic scalpel system is a schematic diagram, and comprises a transducer 11, an ultrasonic scalpel head shell 12, an ultrasonic scalpel head sleeve 13, an ultrasonic scalpel bar 14 and the like, wherein the ultrasonic scalpel bar 14 is coupled with the transducer 11 inside the ultrasonic scalpel head sleeve 13, and the transducer 11 is connected with the generator through a cable 15.
The ultrasonic blade system may be generally equivalent to an equivalent circuit having a main leg and first and second "dynamic" legs, as shown in fig. 2. The first branch is mainly a static capacitor C0 and is a parasitic parameter of the handle of the ultrasonic knife. The second "dynamic" branch comprises an inductor L1, a resistor R1 and a capacitor C1 which are connected in series, wherein the inductor L1, the resistor R1 and the capacitor C1 are the electromechanical properties of the main body part of the ultrasonic scalpel. The generator of a conventional ultrasonic blade introduces a tuning inductor Ls on the main line which is used to detune the static capacitance at the resonant frequency so that substantially all of the current output of the generator flows into the second "dynamic" branch. Thus, the actual measured voltage, current, voltage current phase difference parameters are the parameters of the second "dynamic" branch, and the generator control frequency drive output brings the transducer of the ultrasonic blade at the resonant frequency. The tuning inductor Ls also transforms the phase impedance diagram of the transducer of the ultrasonic blade to improve the frequency locking capability of the generator.
However, the tuning inductor Ls must be matched to the specific static capacitance of the transducer of the ultrasonic blade. Transducers with different ultrasonic blades having different static capacitances require different tuning inductors. This makes an ultrasonic knife system can only use one type of ultrasonic knife, and the commonality is relatively poor. The present application is directed to solving the above-mentioned problems and providing an ultrasonic blade phase locking method and an ultrasonic blade system capable of controlling a frequency without a tuning inductor.
Disclosure of Invention
In view of the defects of the prior art, the present invention provides a phase locking method for an ultrasonic blade system and an ultrasonic blade system with good versatility.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a method of locking a phase of an ultrasonic blade system including an ultrasonic blade, a transducer, and a generator connected, the method comprising the steps of:
step S1, a generator generates an initial current signal and sends the initial current signal to a transducer to serve as a current working signal of an ultrasonic knife;
s2, measuring to obtain a voltage value and a current value of a main circuit in an ultrasonic knife equivalent circuit, wherein the ultrasonic knife equivalent circuit comprises the main circuit, a first branch circuit and a second branch circuit, the first branch circuit and the second branch circuit are connected with the main circuit in parallel, the main circuit is formed by directly connecting the generator and the ultrasonic knife without a tuning inductor, the ultrasonic knife comprises an ultrasonic knife handle and an ultrasonic knife main body which are connected, the first branch circuit is a parasitic electrostatic capacitor of the ultrasonic knife handle, and the second branch circuit comprises a first inductor, a first resistor and a first capacitor which are connected in series and is the electromechanical performance of the ultrasonic knife main body;
s3, calculating a voltage effective value, a current effective value and a voltage-current phase difference of the trunk circuit according to the voltage value and the current value of the trunk circuit;
s4, calculating a voltage value, a current value and a voltage-current phase difference of a second branch according to the voltage effective value, the current effective value, the voltage-current phase difference and the vector diagram of the trunk circuit;
and S5, controlling a generator to generate a current signal under a new frequency according to the voltage value, the current value and the voltage-current phase difference of the second branch circuit, sending the current signal to the transducer to drive the ultrasonic knife to work, and returning to the step S2 for circulation.
Further, in step S1, the frequency of the initial current signal is far away from the resonance point.
Further, in the step S2, the voltage value and the current value of the trunk circuit in the ultrasonic blade equivalent circuit are obtained by measuring and sampling through the ADC according to the sampling frequency.
Further, the sampling frequency is dynamically adjusted according to the frequency of the current working signal of the ultrasonic knife.
Further, in step S3, the voltage effective value, the current effective value, and the voltage-current phase difference of the trunk are calculated according to the voltage value and the current value of the trunk by using fast fourier transform, and after the voltage effective value and the current effective value of the trunk are calculated, the voltage-current phase difference is obtained by detecting a zero-crossing time according to the voltage effective value and the current effective value of the trunk.
Further, in step S4, calculating a voltage value, a current value, and a voltage-current phase difference of the second branch according to the voltage effective value, the current effective value, the voltage-current phase difference, and the vector diagram of the trunk, including:
U 1 ＝U；
Figure BDA0003261946920000041
Figure BDA0003261946920000042
wherein, U 1 Is the voltage value of the second branch, U is the effective voltage value of the trunk, I 1 Is the current value of the second branch, I is the effective value of the current of the main circuit, theta 1 Is the voltage-current phase difference of the second branch, theta is the voltage-current phase difference of the main branch, C 0 Is the parasitic static capacitance of the handle of the ultrasonic knife in the first branch.
Further, in step S5, the step of calculating a frequency variation according to the voltage value, the current value, and the voltage-current phase difference of the second branch, wherein the current signal generated by the control generator at the new frequency is used as the current working signal of the ultrasonic scalpel, and the frequency variation is calculated according to the difference between the voltage-current phase difference of the second branch and the target phase difference and the first resistance, the first capacitance, the first inductance, and the voltage-current phase difference of the second branch, includes:
Figure BDA0003261946920000043
Figure BDA0003261946920000044
Figure BDA0003261946920000045
θ' (ω) is positive; or alternatively
Figure BDA0003261946920000046
θ' (ω) is negative;
wherein f is Δ For the amount of frequency change, θ 1 Is the second branch voltage current phase difference, omega is angular frequency, omega =2 pi f, f is the frequency of the current working signal, k is a proportionality coefficient, which is set according to the actual situation, theta') omega) is the derivative of the second branch voltage current phase difference on the angular frequency omega, m is an intermediate variable used for simplifying the formula, without actual meaning, omega =2 pi f s To preset a fixed frequency, theta' (ω) s ) Is the voltage current phase difference of the second branch circuit to the preset fixed frequency omega s The derivative of (c) is equal to the formula of θ' (ω);
and then generating a current signal under a new frequency according to the frequency variation and the frequency of the current working signal to serve as the current working signal of the ultrasonic knife.
Further, in step S5, the generator is controlled to generate a current signal at a new frequency as a current working signal of the ultrasonic blade according to the voltage value, the current value, and the voltage-current phase difference of the second branch, and the frequency of the current signal of the generator is controlled to directly reach the resonant frequency after the second branch series resonant frequency is directly calculated according to the voltage value, the current value, and the voltage-current phase difference of the second branch as the current working signal of the ultrasonic blade.
Further, in the step S1, the initial current signal is an initial current sinusoidal signal generating a specific frequency and amplitude and an arbitrary phase;
the method further comprises the following steps:
and S6, after the shearing is finished, closing the current output.
The invention also discloses an ultrasonic knife system which comprises the ultrasonic knife, the transducer and the generator which are connected, wherein the generator generates a current signal to be sent to the transducer as a current working signal of the ultrasonic knife by using the phase locking method of the ultrasonic knife system.
The ultrasonic knife system phase locking method and the ultrasonic knife system are characterized in that the voltage value and the current value of a trunk circuit in an ultrasonic knife equivalent circuit are measured, then the voltage value, the current value and the voltage-current phase difference of a branch circuit are calculated according to the voltage value and the current value of the trunk circuit, and a new frequency signal is generated according to the voltage value, the current value and the voltage-current phase difference of the branch circuit to work in a circulating reciprocating mode, so that a transducer works under a resonant frequency without tuning an inductor.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of an ultrasonic blade system;
FIG. 2 is an equivalent circuit diagram of an ultrasonic blade;
FIG. 3 is a schematic flow chart illustrating a phase locking method for an ultrasonic scalpel system according to an embodiment of the present invention;
FIG. 4 is an equivalent circuit diagram of an ultrasonic blade of the present invention;
FIG. 5 is a schematic diagram illustrating the detection of voltage-current phase difference;
FIG. 6 is a waveform diagram of a current signal output by the generator;
FIG. 7 is a vector diagram with current as a variable;
fig. 8 is a graph of phase versus frequency.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 3, an ultrasonic blade system phase locking method according to an embodiment of the present invention includes an ultrasonic blade, a transducer and a generator, which are connected to each other, and includes the following steps:
step S1, a generator generates an initial current signal and sends the initial current signal to a transducer to serve as a current working signal of an ultrasonic knife;
s2, measuring to obtain a voltage value and a current value of a main circuit in an ultrasonic knife equivalent circuit, wherein the ultrasonic knife equivalent circuit comprises the main circuit and a first branch circuit and a second branch circuit (as shown in figure 4) which are connected with the main circuit in parallel, the main circuit is formed by directly connecting a generator and an ultrasonic knife without a tuning inductor, the ultrasonic knife comprises an ultrasonic knife handle and an ultrasonic knife main body which are connected, the first branch circuit is a parasitic electrostatic capacitor of the ultrasonic knife handle, and the second branch circuit comprises a first inductor, a first resistor and a first capacitor which are connected in series and is the electromechanical performance of the ultrasonic knife main body;
s3, calculating a voltage effective value, a current effective value and a voltage-current phase difference of the trunk circuit according to the voltage value and the current value of the trunk circuit;
s4, calculating a voltage value, a current value and a voltage-current phase difference of a second branch according to the voltage effective value, the current effective value, the voltage-current phase difference and the vector diagram of the trunk circuit;
and S5, controlling the generator to generate a current signal under a new frequency according to the voltage value, the current value and the voltage-current phase difference of the second branch circuit, sending the current signal to the transducer to drive the ultrasonic knife to work, and returning to the step S2 for circulating.
In the step S1, the initial current signal is an initial current sine signal with a specific frequency and amplitude and an arbitrary phase, in a preferred scheme, a sine signal and a cosine signal with a phase difference of pi/2 are used, in other embodiments, other specific signals may be set according to actual needs, the amplitude and the phase of the initial current signal may also be set arbitrarily, and the frequency of the initial current signal is far away from the resonance point. Due to the different processes and designs of each ultrasonic blade, the resonant frequency of the ultrasonic blades is different, and the resonant frequency is reduced when the temperature is increased. And because the phase-locked signal is larger than the resonant frequency and passes through the vicinity of the anti-resonant point, and the impedance near the anti-resonant point is very large, which causes the problems of overlarge output power, oscillation and the like, the frequency of the initial current signal of the equipment is definitely smaller than the resonant frequency, and the frequency smaller than the resonant frequency 2000-2500 is generally selected as the frequency of the initial current signal according to experience.
In the step S2, the voltage value and the current value of the trunk circuit in the ultrasonic blade equivalent circuit are obtained by measuring and sampling through the ADC according to the sampling frequency. The sampling frequency is dynamically adjusted according to the frequency of the current working signal of the ultrasonic knife, for example, the fundamental frequency is always equal to the last output frequency, so that the voltage, current and voltage-current phase difference values of the required frequency components can be accurately obtained.
In step S3, the voltage effective value, the current effective value, and the voltage-current phase difference of the trunk are calculated according to the voltage value and the current value of the trunk by using fast fourier transform, and after the voltage effective value and the current effective value of the trunk are calculated, the voltage-current phase difference is obtained by detecting the zero-crossing time according to the voltage effective value and the current effective value of the trunk (as shown in fig. 5). The waveform shape of the current signal output from the generator is affected by various distortion sources present in the output drive circuit (e.g., power transformer, power amplifier), thereby generating harmonics, and the actual waveform is not a single wave (as shown in fig. 6). The latter frequency control calculation does not want to use these higher harmonic components, so the method uses Fast Fourier Transform (FFT) to obtain the voltage, current effective values and further calculate the voltage current phase difference parameter values.
In step S4, calculating a voltage value, a current value, and a voltage-current phase difference of the second branch according to the voltage effective value, the current effective value, the voltage-current phase difference, and the vector diagram of the trunk, including:
U 1 ＝U；
Figure BDA0003261946920000091
Figure BDA0003261946920000092
wherein, U 1 Is the voltage value of the second branch, U is the effective voltage value of the trunk, I 1 Is the current value of the second branch, I is the effective value of the current of the main circuit, theta 1 Is the voltage-current phase difference of the second branch, theta is the voltage-current phase difference of the main branch, C 0 Is the parasitic static capacitance of the handle of the ultrasonic knife in the first branch. As shown in fig. 7, a vector diagram with current as a variable can be obtained according to the equivalent circuit.
In step S5, the step of calculating the frequency variation according to the voltage value, the current value, and the voltage-current phase difference of the second branch, and the difference between the voltage-current phase difference of the second branch and the target phase difference, wherein the current signal generated by the control generator according to the voltage value, the current value, and the voltage-current phase difference of the second branch is used as the current working signal of the ultrasonic scalpel, and the frequency variation includes:
Figure BDA0003261946920000093
Figure BDA0003261946920000094
Figure BDA0003261946920000095
θ' (ω) is positive; or alternatively
Figure BDA0003261946920000096
θ' (ω) is negative;
wherein, f Δ For the frequency variation, θ 1 is the second branch voltage current phase difference, ω is the angular frequency, ω =2 π f, f is the frequency of the current working signal, k is the proportionality coefficient, which is set according to the actual situation, θ' (ω) is the derivative of the second branch voltage current phase difference with respect to the angular frequency ω, m is the intermediate variable, which is mainly used to simplify the formula, without practical meaning, ω is a derivative of the intermediate variable s To preset a fixed frequency, theta' (ω) s ) Is the voltage-current phase difference of the second branch circuit to the preset fixed frequency omega s The derivative of (c) is equal to the formula of θ' (ω);
and then generating a current signal under a new frequency according to the frequency variation and the frequency of the current working signal to serve as the current working signal of the ultrasonic knife.
The specific principle is that after the voltage, current, voltage and current phase difference of the second branch circuit is calculated, the frequency of the output signal can be adjusted so that the voltage and current phase difference of the second branch circuit approaches a certain specific value, such as 0 degree. The present embodiment adopts a method of calculating the frequency change amount from the current impedance and the phase difference, that is, from the difference between the current second branch phase difference and the target phase difference (generally, 0 degree). From the equivalent circuit shown in fig. 4, the relationship between the phase difference θ and the frequency ω is obtained as follows:
Figure BDA0003261946920000101
deriving theta from omega to obtain theta' (omega);
as shown in fig. 8, the larger the slope of the approach resonance point, the smaller the frequency to be changed, the smaller the slope of the left side of the resonance point away from the resonance point, the larger the change of the frequency to be approached to the resonance point, the negative slope of the right side of the resonance point away from the resonance point, and the interval in which the slope of the resonance point is positive. The slope of the same phase difference point under different impedances is different, the smaller the impedance is, the phase difference is, the steeper the frequency curve is, so the frequency variation f is obtained according to the above conditions Δ The calculation formula of (2). And wherein θ' (ω) is positive according to the formula
Figure BDA0003261946920000111
Making adjustment according to formula when negative
Figure BDA0003261946920000112
And returning to the interval with positive slope at the resonance point as soon as possible. Wherein ω is s The frequency of the initial current signal can be selected and specifically adjusted according to actual conditions.
Of course, in step S5, the generator is controlled to generate a current signal at a new frequency as the current working signal of the ultrasonic blade according to the voltage value, the current value, and the voltage-current phase difference of the second branch, or the frequency of the current signal of the generator is controlled to directly reach the resonant frequency after the second branch series resonant frequency is directly calculated according to the voltage value, the current value, and the voltage-current phase difference of the second branch as the current working signal of the ultrasonic blade. However, the RLC circuit is oscillated due to too large frequency change in the method, and the impedance, the capacitance and the inductance of the second branch circuit are changed according to the temperature of the cutter point cutter bar and the shearing pressure of the cutter point, so that a large error exists in the calculation of the resonant frequency.
Finally, the method further comprises:
and S6, after the shearing is finished, closing the current output.
After the operation shearing work is finished, the power supply can be turned off, the current output is turned off, and the work is finished.
The invention also provides an ultrasonic scalpel system which comprises the ultrasonic scalpel, the transducer and the generator which are connected, wherein the generator generates a current signal to be sent to the transducer as a current working signal of the ultrasonic scalpel by using the phase locking method of the ultrasonic scalpel system.
According to the phase locking method of the ultrasonic knife system and the ultrasonic knife system, the voltage value and the current value of the trunk circuit in the ultrasonic knife equivalent circuit are measured, then the voltage value, the current value and the voltage-current phase difference of the branch circuit are calculated according to the voltage value and the current value of the trunk circuit, and a new frequency signal is generated according to the voltage value, the current value and the voltage-current phase difference of the branch circuit to work in a circulating reciprocating mode, so that the transducer works under the resonance frequency, an inductor does not need to be tuned, and the universality is good.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A method of phase locking an ultrasonic blade system, the ultrasonic blade system including an ultrasonic blade, a transducer, and a generator coupled together, the method comprising the steps of:
step S1, a generator generates an initial current signal and sends the initial current signal to a transducer to serve as a current working signal of an ultrasonic knife;
s2, measuring to obtain a voltage value and a current value of a main circuit in an ultrasonic knife equivalent circuit, wherein the ultrasonic knife equivalent circuit comprises the main circuit, a first branch circuit and a second branch circuit, the first branch circuit and the second branch circuit are connected with the main circuit in parallel, the main circuit is formed by directly connecting the generator and the ultrasonic knife without a tuning inductor, the ultrasonic knife comprises an ultrasonic knife handle and an ultrasonic knife main body which are connected, the first branch circuit is a parasitic electrostatic capacitor of the ultrasonic knife handle, and the second branch circuit comprises a first inductor, a first resistor and a first capacitor which are connected in series and is the electromechanical performance of the ultrasonic knife main body;
s3, calculating a voltage effective value, a current effective value and a voltage-current phase difference of the trunk circuit according to the voltage value and the current value of the trunk circuit;
s4, calculating a voltage value, a current value and a voltage-current phase difference of a second branch according to the voltage effective value, the current effective value, the voltage-current phase difference and the vector diagram of the trunk circuit;
and S5, controlling the generator to generate a current signal under a new frequency according to the voltage value, the current value and the voltage-current phase difference of the second branch circuit, sending the current signal to the transducer to drive the ultrasonic knife to work, and returning to the step S2 for circulating.
2. The method of claim 1, wherein in step S1, the frequency of the initial current signal is far from a resonance point.
3. The method according to claim 1, wherein in the step S2, the voltage value and the current value of the trunk circuit in the ultrasonic blade equivalent circuit are obtained by ADC sampling according to a sampling frequency.
4. The method of claim 3, wherein the sampling frequency is dynamically adjusted based on a frequency of a current operating signal of the ultrasonic blade.
5. The method according to claim 1, wherein in step S3, the calculating of the main circuit voltage effective value, current effective value, and voltage-current phase difference according to the main circuit voltage value and current value is performed by using fast fourier transform according to the main circuit voltage value and current value, and after calculating the main circuit voltage effective value and current effective value, the voltage-current phase difference is obtained by detecting a zero-crossing time according to the main circuit voltage effective value and current effective value.
6. The method according to claim 1, wherein in step S4, calculating the voltage value, the current value, and the voltage-current phase difference of the second branch according to the voltage effective value, the current effective value, the voltage-current phase difference, and the vector diagram of the trunk includes:
U 1 ＝U；
Figure FDA0003261946910000021
Figure FDA0003261946910000022
wherein, U 1 Is the voltage value of the second branch, U is the effective voltage value of the trunk, I 1 Is the current value of the second branch, I is the effective value of the current of the main circuit, theta 1 Is the voltage-current phase difference of the second branch, theta is the voltage-current phase difference of the main branch, C 0 Is the parasitic static capacitance of the handle of the ultrasonic knife in the first branch.
7. The method according to claim 6, wherein in step S5, the controlling the generator to generate a current signal at a new frequency as the current working signal of the ultrasonic blade according to the voltage value, the current value, and the voltage-current phase difference of the second branch, and the frequency variation is calculated according to the difference between the first resistance, the first capacitance, the first inductance of the second branch, and the voltage-current phase difference of the second branch and the target phase difference, and includes:
Figure FDA0003261946910000031
Figure FDA0003261946910000032
Figure FDA0003261946910000033
θ' (ω) is positive; or alternatively
Figure FDA0003261946910000034
θ' (ω) is negative;
wherein f is Δ As the amount of frequency change, θ 1 The phase difference of the voltage and the current of the second branch is omega, angular frequency is omega =2 pi f, f is the frequency of the current working signal, k is a proportionality coefficient and is set according to actual conditions, theta' (omega) is the derivative of the phase difference of the voltage and the current of the second branch on the angular frequency omega, m is an intermediate variable and is used for simplifying a formula, the actual meaning is not available, and omega is a variable s To preset a fixed frequency, theta' (ω) s ) Is the voltage current phase difference of the second branch circuit to the preset fixed frequency omega s The derivative of (c) is equal to the formula of θ' (ω);
and then generating a current signal under a new frequency according to the frequency variation and the frequency of the current working signal to serve as the current working signal of the ultrasonic knife.
8. The method according to claim 1, wherein in step S5, the generator is controlled to generate a current signal at a new frequency as the current working signal of the ultrasonic blade according to the voltage value, the current value and the voltage-current phase difference of the second branch, and the frequency of the current signal of the generator is controlled to directly reach the resonant frequency after the second branch series resonant frequency is directly calculated as the current working signal of the ultrasonic blade according to the voltage value, the current value and the voltage-current phase difference of the second branch.
9. The method according to claim 1, wherein in step S1, the initial current signal is an initial current sinusoidal signal with a specific frequency and amplitude and an arbitrary phase;
the method further comprises the following steps:
and S6, after the shearing is finished, closing the current output.
10. An ultrasonic blade system comprising an ultrasonic blade, a transducer and a generator connected to generate a current signal to be sent to the transducer as a present operating signal of the ultrasonic blade using the ultrasonic blade system phase locking method according to any one of claims 1 to 9.
CN202111075013.1A 2021-09-14 2021-09-14 Ultrasonic scalpel system phase locking method and ultrasonic scalpel system Pending CN115429389A (en)

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