CN112754604B - Ultrasonic knife host, ultrasonic knife system and automatic matching method for impedance of transducer of ultrasonic knife system - Google Patents
Ultrasonic knife host, ultrasonic knife system and automatic matching method for impedance of transducer of ultrasonic knife system Download PDFInfo
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Abstract
The invention provides an ultrasonic knife host, an ultrasonic knife system and an automatic impedance matching method for an ultrasonic knife system transducer, wherein the ultrasonic knife system obtains a real-time static capacitance of an ultrasonic transducer through calculation, and obtains a value range of a matched inductance through calculation by combining with a working frequency range of the ultrasonic knife system, and then selects a proper inductance from a transducer matching circuit to access the ultrasonic transducer, so that the inductance value of the matched inductance can be effectively and dynamically adjusted according to the static capacitance of the ultrasonic transducer and the change of the working frequency range of the ultrasonic knife system, the maximum matching is realized, and the ultrasonic transducer works in an optimal state; in addition, if the matching of the inductors fails, the ultrasonic transducer is aged seriously and may not work normally, the inductors need to be matched again after the ultrasonic transducer is replaced, the matching of the ultrasonic transducer and the matched inductors is further ensured to the maximum extent through indirect inspection of the working state of the ultrasonic transducer, and the working efficiency of the ultrasonic transducer is improved.
Description
Technical Field
The invention relates to the technical field of ultrasonic knives, in particular to an ultrasonic knife host, an ultrasonic knife system and an automatic impedance matching method for a transducer of the ultrasonic knife system.
Background
An ultrasonic scalpel (an ultrasonic cutting hemostatic scalpel) is a common surgical scalpel, has the characteristics of small wound, less smoke, blood coagulation and the like in the operation process, and can be widely applied to surgical operations. The ultrasonic knife (system) consists of an ultrasonic knife host machine, an ultrasonic transducer and an ultrasonic knife head, and the working principle is that the ultrasonic knife host machine generates a power source with certain frequency to the ultrasonic transducer, the ultrasonic transducer generates mechanical vibration with the frequency and drives the ultrasonic knife head to generate mechanical vibration, and the ultrasonic knife (system) can cut small-area human tissues because of high frequency and small amplitude.
Wherein the equivalent circuit of the ultrasonic transducer is shown as a dashed box in FIG. 1, L1Is a dynamic inductor, C1In the form of a dynamic capacitor, the capacitance,R1the three are dynamic resistors, form a series circuit and also are mechanical circuits, and can change according to different loads; c0The static capacitor, namely the capacitor in a static state, is connected in parallel in the circuit. In operation, the ultrasonic blade main unit generates power at a frequency that minimizes the impedance of the mechanical circuit to achieve maximum efficiency. According to the principle of series resonant circuit, the frequency needs to be satisfied
When the ultrasonic transducer works in a series resonance state, the series loop is equivalent to only a dynamic resistor R1The impedance is minimum and the efficiency is highest. But because of the static capacitance C0The presence of the capacitive element limits the efficiency of the operation of the ultrasonic transducer even at the point of the series resonance frequency, and with the current technology, the static capacitance C0Cannot be eliminated, and it is common practice to use a fixed inductor L0Connected in parallel or in series in a loop (as shown in fig. 1 and 2) to make the inductor L0And a static capacitance C0The working is in a resonance state under the current working frequency, thereby meeting the requirements
Because of the static capacitance C0Relatively fixed, so only one proper inductance L needs to be selected0Matching with it, the purpose can be achieved.
However, in the working process of the ultrasonic blade system, due to the change of the load, the series resonance frequency is not fixed but changes within a certain range, for example, the frequency change of the ultrasonic blade system is 55KHz to 56 KHz; while the static capacitance C of the different ultrasonic transducers0Also has different sizes, and according to the characteristics of the ultrasonic transducer, the longer the service life is, the static capacitance C is0The value of (c) will increase slowly. According to the formula of parallel resonance
Wherein, ω is0＝2πf0Frequency f of ultrasonic signal0And a static capacitance C0Can all change the inductance L0So that the value of the inductance L is fixed0The inductance L is not necessarily made0And a static capacitance C0When the ultrasonic scalpel system works in a resonance state, although the impedance of the circuit formed by the ultrasonic scalpel system and the circuit is not in the resonance state is large, the impedance of the series resonance loop is less influenced, if the ultrasonic scalpel system works in a high-impedance environment, such as when some hard tissues are cut, the impedance is large, and at the moment, the inductor L0And a static capacitance C0The impedance of the loop will have an effect on the impedance of the series loop and will reduce the efficiency of operation.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide an automatic impedance matching solution for ultrasonic blade system transducers, which solves the above-mentioned technical problems.
To achieve the above and other related objects, the present invention provides an ultrasonic blade main unit, including: the device comprises a digital signal processor, a programmable logic module, a waveform generator, a digital-to-analog converter, a power amplification circuit, a transducer matching circuit, a voltage sampling conversion module and a current sampling conversion module;
the digital signal processor is connected with the waveform generator, the waveform generator is connected with the input end of the power amplifying circuit, the digital signal processor is connected with the digital-to-analog converter, the digital-to-analog converter is connected with the input end of the power amplifying circuit, the output end of the power amplifying circuit is connected with the transducer matching circuit, the digital signal processor is connected with the transducer matching circuit, and the digital signal processor adjusts and controls the inductance provided by the transducer matching circuit;
the output end of the power amplifying circuit is connected with the voltage sampling conversion module, the voltage sampling conversion module is connected with the programmable logic module, the output end of the power amplifying circuit is connected with the current sampling conversion module, the current sampling conversion module is connected with the programmable logic module, and the programmable logic module is connected with the digital signal processor;
the programmable logic module calculates the impedance of an external ultrasonic transducer according to the output voltage and the output current, the digital signal processor calculates the static capacitance of the ultrasonic transducer according to the impedance and calculates the value range of the matching inductance of the ultrasonic transducer according to the static capacitance, and the digital signal processor automatically connects the inductance in the transducer matching circuit to the ultrasonic transducer in a matching mode according to the value range of the matching inductance.
Optionally, the transducer matching circuit includes a chip selection chip and a plurality of inductors with different inductance values, one inductor is connected in series to each selection channel of the chip selection chip, a control terminal of the chip selection chip is connected to the digital signal processor, and output terminals of the chip selection chip are respectively connected to the ultrasonic transducer and the output terminal of the power amplification circuit.
Optionally, the ultrasonic scalpel host further comprises a microcontroller, an input module, a display module, an audio playing module and a communication module, wherein the microcontroller is respectively connected with the input module, the display module, the audio playing module and the communication module, and the microcontroller is further connected with the digital signal processor.
Optionally, the ultrasonic scalpel host further comprises a switching power supply module, and the switching power supply module is connected with the power amplification circuit and provides power for the power amplification circuit.
Optionally, the ultrasonic knife host further includes a safety detection module, the safety detection module is connected to the output end of the power amplification circuit, the safety detection module is further connected to the programmable logic module, the safety detection module monitors the output voltage and the output current of the power amplification circuit, and an alarm signal is fed back to the programmable logic module when an abnormal condition is found.
Optionally, the voltage sampling conversion module includes a voltage sampling unit and a first analog-to-digital conversion unit, an input end of the voltage sampling unit is connected to an output end of the power amplification circuit, an output end of the voltage sampling unit is connected to an input end of the first analog-to-digital conversion unit, and an output end of the first analog-to-digital conversion unit is connected to the programmable logic module; the current sampling conversion module comprises a current sampling unit and a second analog-to-digital conversion unit, wherein the input end of the current sampling unit is connected with the output end of the power amplification circuit, the output end of the current sampling unit is connected with the input end of the second analog-to-digital conversion unit, and the output end of the second analog-to-digital conversion unit is connected with the programmable logic module.
Meanwhile, in order to achieve the above object and other related objects, the present invention further provides an ultrasonic scalpel system, including the ultrasonic scalpel host described in any one of the above objects, further including an ultrasonic transducer and an ultrasonic scalpel head, wherein an output terminal of the power amplification circuit is connected to an output terminal of the transducer matching circuit and an input terminal of the ultrasonic transducer, respectively, and an output terminal of the ultrasonic transducer is connected to the ultrasonic scalpel head.
Optionally, the ultrasonic scalpel system further comprises a gear control module, the gear control module is connected with the digital signal processor, and the gear control module is used for adjusting and controlling the output energy of the ultrasonic scalpel host.
In addition, to achieve the above and other related objects, the present invention provides a method for automatically matching impedance of a transducer of an ultrasonic blade system, comprising the steps of:
providing an ultrasonic knife system, wherein the ultrasonic knife system comprises an ultrasonic knife host and an ultrasonic transducer, the ultrasonic knife host comprises a transducer matching circuit, and the transducer matching circuit can provide a plurality of inductances with different inductance values;
starting the ultrasonic knife host, controlling the transducer matching circuit to connect a first inductor into the ultrasonic transducer, and outputting a first frequency signal to the ultrasonic transducer;
detecting the output voltage and the output current of the ultrasonic knife host, and calculating impedance according to the output voltage and the output current;
calculating a static capacitance of the ultrasonic transducer from the first inductance, the frequency of the first frequency signal, and the impedance;
calculating the value range of the matching inductance according to the static capacitance and the working frequency range of the ultrasonic scalpel system and a parallel resonance formula;
and controlling the transducer matching circuit to connect a second inductor into the ultrasonic transducer, wherein the inductance value of the second inductor meets the value range of the matching inductor.
Optionally, the frequency of the first frequency signal is less than a resonant frequency of the ultrasonic blade system.
Optionally, the calculation formula of the static capacitance of the ultrasonic transducer is:
wherein, C0Representing the static capacitance of the ultrasonic transducer, Z representing the impedance, L0Representing said first inductance, ωz＝2πfz，ωzRepresenting the angular frequency, f, of said first frequency signalzRepresenting the frequency of the first frequency signal.
Optionally, the method for automatically matching the impedance of the transducer of the ultrasonic blade system further comprises the steps of:
and if the second inductor meeting the value range of the matching inductor does not exist in the transducer matching circuit, repeating the steps after replacing the ultrasonic transducer.
As described above, the ultrasonic scalpel main body of the present invention has the following beneficial effects:
the transducer matching circuit is added in the ultrasonic knife host, the programmable logic module calculates the impedance of the external ultrasonic transducer according to the output voltage and the output current, the digital signal processor calculates the static capacitance of the external ultrasonic transducer according to the impedance and calculates the value range of the matching inductance of the external ultrasonic transducer according to the static capacitance, the digital signal processor automatically matches and accesses the inductance in the transducer matching circuit into the external ultrasonic transducer according to the value range of the matching inductance, the inductance value of the matching inductance can be effectively and dynamically adjusted according to the real-time static capacitance of the ultrasonic transducer and the change of the working frequency range of the ultrasonic knife system, the maximum matching is realized, the ultrasonic transducer works in the optimal state, and the working efficiency of the ultrasonic transducer is improved.
Drawings
Fig. 1 shows a parallel circuit diagram of an equivalent circuit of an ultrasonic transducer and a matching inductance.
FIG. 2 is a series circuit diagram of an equivalent circuit and a matching inductor of an ultrasonic transducer
Fig. 3 is a schematic structural diagram of an ultrasonic blade system according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a transducer matching circuit according to an embodiment of the present invention.
Figure 5 is a flow chart illustrating automatic matching of impedance of a transducer of an ultrasonic blade system in an embodiment of the present invention.
Description of the reference numerals
1 digital signal processor
2 programmable logic module
3 waveform generator
4D/A converter
5 power amplifying circuit
6 transducer matching circuit
7 voltage sampling conversion module
8 current sampling conversion module
9 safety detection module
10 switching power supply module
11 microcontroller
12 input module
13 display module
14 audio playing module
15 communication module
16 ultrasonic knife main machine
17 ultrasonic transducer
18 ultrasonic knife head
C0Static capacitor
C1Dynamic capacitor
L0、L0-1、L0-2、L0-3、L0-4Inductance
L1Dynamic inductor
R1Dynamic resistance
S1、S2、S3、S4Switch with a switch body
V voltage source (output signal) provided by ultrasonic knife main machine
Detailed Description
As mentioned in the background section above, since the resonant frequency of the ultrasonic blade system is not fixed but fluctuates within a certain range, and the static capacitance of the ultrasonic transducer varies with the age, the parallel resonance formula is used
If an inductance L with a fixed inductance value is connected to the ultrasonic transducer0It is not necessary to make the inductance L0And a static capacitance C0Operating in resonance, inductance L0And a static capacitance C0The impedance of the loop will have an effect on the impedance of the equivalent series loop of the ultrasonic transducer, resulting in a reduced operating efficiency of the ultrasonic transducer.
Based on the technical scheme, the invention provides an automatic matching technical scheme for the impedance of the transducer of the ultrasonic knife system, which comprises the steps of randomly accessing a first inductor to the ultrasonic transducer and outputting a first frequency signal, sampling and feeding back the first frequency signal, and calculating the impedance under the first frequency signal according to the first frequency signal; secondly, calculating the static capacitance of the ultrasonic transducer according to the first inductance, the impedance and the frequency of the first frequency signal; thirdly, calculating the value range of the matching inductance according to the static capacitance of the ultrasonic transducer and the working frequency range of the ultrasonic knife system; and finally, selecting a second inductor meeting the value range of the matching inductor and connecting the second inductor to the ultrasonic transducer.
According to the technical scheme of the automatic matching of the impedance of the transducer of the ultrasonic knife system, the real-time static capacitance of the ultrasonic transducer is obtained through calculation, the value range of the matching inductance is obtained through calculation by combining with the working frequency range (also the change range of the resonant frequency) of the ultrasonic knife system, and then the proper inductance is selected from the transducer matching circuit to be connected into the ultrasonic transducer, so that the inductance value of the matching inductance can be effectively and dynamically adjusted according to the static capacitance of the ultrasonic transducer and the change of the working frequency range of the ultrasonic knife system, the maximum matching is realized, and the ultrasonic transducer works in the optimal state.
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Please refer to fig. 1 to 5. It should be noted that the drawings provided in the present embodiment are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated. The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure.
As shown in fig. 3, the present invention provides an ultrasonic blade main unit 16, which includes: the device comprises a digital signal processor 1, a programmable logic module 2, a waveform generator 3, a digital-to-analog converter 4, a power amplification circuit 5, a transducer matching circuit 6, a voltage sampling conversion module 7 and a current sampling conversion module 8;
the digital signal processor 1 is connected with the waveform generator 3, the waveform generator 3 is connected with the input end of the power amplifying circuit 5, the digital signal processor 1 is connected with the digital-to-analog converter 4, the digital-to-analog converter 4 is connected with the input end of the power amplifying circuit 5, the output end of the power amplifying circuit 5 is connected with the transducer matching circuit 6, the digital signal processor 1 is connected with the transducer matching circuit 6, and the digital signal processor 1 adjusts and controls the inductance provided by the transducer matching circuit 6;
the output end of the power amplifying circuit 5 is connected with a voltage sampling conversion module 7, the voltage sampling conversion module 7 is connected with a programmable logic module 2, the output end of the power amplifying circuit 5 is connected with a current sampling conversion module 8, the current sampling conversion module 8 is connected with the programmable logic module 2, and the programmable logic module 2 is connected with a digital signal processor 1;
the programmable logic module 2 calculates the impedance of the external ultrasonic transducer according to the output voltage and the output current, the digital signal processor 1 calculates the static capacitance of the ultrasonic transducer according to the impedance and calculates the value range of the matching inductance of the external ultrasonic transducer according to the static capacitance, and the digital signal processor 1 automatically connects the inductance in the transducer matching circuit 6 to the external ultrasonic transducer in a matching mode according to the value range of the matching inductance.
Wherein the digital signal processor 1 comprises a programmable digital signal processor, such as a monolithic signal processor
Or very large scale integrated circuit (VLSI) array processors, etc.; the programmable logic module 2 comprises a programmable logic device (CPLD) or a Field Programmable Gate Array (FPGA) and the like; the waveform generator 3 includes a direct digital frequency synthesizer (DDS), etc.; the final stage of the power amplifying circuit 5 may be a circuit of various driving types, such as a class a amplifier, a class b amplifier, a class ab amplifier, a half-bridge driver, a full-bridge driver, or an H-bridge driver, which may implement a circuit structure of sine wave amplification.
Alternatively, as shown in FIG. 4, the transducer matching circuit 6 includes a chip select chip (e.g., a dedicated chip select chip 74HS138) and a plurality of inductors (e.g., L) with different inductance values0-1、L0-2、L0-3、L0-4Etc.), each selection channel of the chip-select chip is connected with an inductor in series, and each selection channel is provided with a switch (such as S)1、S2、S3、S4) And the control end (the control end of each switch) of the chip selection chip is connected with the digital signal processor 1, and the output end of the chip selection chip is respectively connected with the ultrasonic transducer and the output end of the power amplification circuit 5. Under the instruction control of the digital signal processor 1, the chip selection chip is only closed by one at a timeOnly one inductor of each switch is connected into the circuit at one time.
Alternatively, the transducer matching circuit 6 may also be of other structures, such as a structure based on an adjustable inductor, the control end of which is connected to the digital signal processor 1, and the output end of which is connected to the output ends of the ultrasonic transducer and the power amplifying circuit 5, respectively.
In detail, the voltage sampling conversion module 7 includes a voltage sampling unit and a first analog-to-digital conversion unit (not shown in the figure), an input end of the voltage sampling unit is connected with an output end of the power amplification circuit 5, an output end of the voltage sampling unit is connected with an input end of the first analog-to-digital conversion unit, and an output end of the first analog-to-digital conversion unit is connected with the programmable logic module 2; the current sampling conversion module 8 includes a current sampling unit and a second analog-to-digital conversion unit (not shown in the figure), an input end of the current sampling unit is connected with an output end of the power amplification circuit 5, an output end of the current sampling unit is connected with an input end of the second analog-to-digital conversion unit, and an output end of the second analog-to-digital conversion unit is connected with the programmable logic module 2.
The voltage sampling unit samples the voltage of an output signal, and the first analog-to-digital conversion unit converts an analog voltage signal obtained by sampling into a digital signal; the current sampling unit samples the current of the output signal, and the second analog-to-digital conversion unit converts the analog current signal obtained by sampling into a digital signal.
In detail, as shown in fig. 3, the ultrasonic scalpel host 16 further includes a safety detection module 9, the safety detection module 9 is connected to the output end of the power amplification circuit 5, the safety detection module 8 is further connected to the programmable logic module 2, the safety detection module 9 monitors the output voltage and the output current of the power amplification circuit 5, and when an abnormal condition is found, an alarm signal is fed back to the programmable logic module 2.
In detail, as shown in fig. 3, the ultrasonic blade host 16 further includes a switching power supply module 10, and the switching power supply module 10 is connected to the power amplification circuit 5 to supply power to the power amplification circuit 5.
Optionally, as shown in fig. 3, the ultrasonic scalpel host 16 further includes a microcontroller 11, an input module 12, a display module 13, an audio playing module 14, and a communication module 15, where the microcontroller 11 is connected to the input module 12, the display module 12, the audio playing module 14, and the communication module 15, respectively, and the microcontroller 11 is further connected to the digital signal processor 1. Based on the design of the peripheral input output structure, the digital signal processor 1 can efficiently send or receive a response instruction.
The micro-controller 11 includes the commonly used embedded micro-controllers, such as ARM of advanced RISC machine, DSP of TI, MIPS of silicon graphics, Power PC of IBM and Motorola, x86 and i960 chips of Intel, Am386EM of AMD, and SH RISC chip of Hitachi; the input module 12 includes input devices such as a mouse and a keyboard; the display module 13 includes a display such as an LCD and an LED; the audio playing module 14 includes a speaker and the like; the communication module 15 comprises wired or wireless communication modules such as a USB (universal serial bus), a serial port, a 3G (third generation telecommunication) module, a 4G (fourth generation telecommunication) module and the like, and can realize data interaction between the ultrasonic knife host 16 and external equipment.
In more detail, as shown in fig. 3, the digital signal processor 1 communicates with the waveform generator 3 to generate a sine wave signal with a certain frequency, and at the same time, the digital signal processor 1 generates an analog voltage through the digital-to-analog converter 4, and the analog voltage are input to the power amplifying circuit 5, and through the switching power module 10, a power source with a specific frequency required by the ultrasonic transducer is generated, so that mechanical vibration is generated on the ultrasonic transducer, and the power is transmitted to the ultrasonic blade to cut human tissues. A certain load is generated in the cutting process of the ultrasonic knife head, the load is transmitted to a power output loop of an ultrasonic knife main machine 16 through an equivalent circuit and a matching circuit of an ultrasonic transducer, a voltage sampling conversion module 7 and a current sampling conversion module 8 are arranged in the power output loop, the output current and voltage are sampled and subjected to analog-to-digital conversion, the sampled and converted current and voltage are transmitted to a programmable logic module 2, the programmable logic module 2 calculates the output current, the output voltage, the phase of the output current, the phase of the output voltage, corresponding impedance (calculated according to the output current and the output voltage) and the like, the programmable logic module 2 transmits the calculation result to a digital signal processing 1, the digital signal processing 1 adjusts the frequency of an output signal through a waveform generator 3 according to the feedback output calculation result, and adjusts the power of the output signal through a digital-to-analog converter 4, a feedback system is formed.
During the operation of the ultrasonic blade system, the ultrasonic blade main unit 16 continuously outputs and feeds back the output voltage and the output current, so that the phase difference between the output voltage and the output current is close to zero, and the ultrasonic transducer operates in a resonance state.
In addition, since the static capacitance of the ultrasonic transducer is not a fixed value, the static capacitance of the ultrasonic transducers in different batches may not be the same, and the static capacitance of the ultrasonic transducer may change after a period of operation. Therefore, the ultrasonic scalpel main body comprises the transducer matching circuit 6, and the inductance L can be adjusted at any time through the transducer matching circuit 60To better match the static capacitance C0And the resonant frequency to improve the operating efficiency of the ultrasonic transducer.
Meanwhile, as shown in fig. 3, the present invention further provides an ultrasonic scalpel system, which includes an ultrasonic scalpel host 16, an ultrasonic transducer 17 and an ultrasonic scalpel head 18, wherein an output end of the power amplifying circuit 5 is respectively connected to an output end of the transducer matching circuit 6 and an input end of the ultrasonic transducer 17, and an output end of the ultrasonic transducer 17 is connected to the ultrasonic scalpel head 18.
The ultrasonic transducer 17 includes piezoelectric ceramics, and converts the electric energy (output signal) provided by the ultrasonic blade main unit 16 into mechanical energy of vibration, generates mechanical vibration in a certain frequency range, has the highest vibration efficiency at a mechanical resonance frequency point, and provides a vibration source for the ultrasonic blade 18.
Optionally, the ultrasonic scalpel system further comprises a switch, the switch is connected with the digital signal processor 1 through a lead, and the switch is used for adjusting and controlling the output energy of the ultrasonic scalpel host 16.
In detail, when matching the inductance for the ultrasonic transducer 17, the ultrasonic blade main unit 16: the programmable logic module 2 calculates the impedance of the external ultrasonic transducer according to the output voltage and the output current, the digital signal processor 1 calculates the static capacitance of the ultrasonic transducer according to the impedance and calculates the value range of the matching inductance of the external ultrasonic transducer according to the static capacitance, and the digital signal processor 1 automatically connects the inductance in the transducer matching circuit 6 to the external ultrasonic transducer in a matching mode according to the value range of the matching inductance.
In more detail, the process of the ultrasonic blade host 16 automatically adjusting the access matching inductance for the ultrasonic transducer 17 according to the feedback output may refer to an automatic matching method of the impedance of the transducer of the ultrasonic blade system as shown in fig. 5, which includes the steps of:
s1, providing an ultrasonic scalpel system, as shown in fig. 3 and 4, the ultrasonic scalpel system includes an ultrasonic scalpel host 16 and an ultrasonic transducer 17, the ultrasonic scalpel host 16 includes a transducer matching circuit 6, and the transducer matching circuit 6 can provide a plurality of inductances with different inductance values;
s2, starting the ultrasonic scalpel host 16, controlling the transducer matching circuit 6 to connect the first inductor to the ultrasonic transducer 17, and outputting a first frequency signal to the ultrasonic transducer 17;
s3, detecting the output voltage and the output current of the ultrasonic scalpel main machine 16, and calculating impedance according to the output voltage and the output current;
s4, calculating the static capacitance C of the ultrasonic transducer 17 according to the first inductance, the frequency of the first frequency signal and the impedance0；
S5, according to static capacitance C0And the working frequency range of the ultrasonic scalpel system, and calculating the value range of the matching inductance according to a parallel resonance formula;
and S6, controlling the transducer matching circuit 6 to connect the second inductor to the ultrasonic transducer 17, wherein the inductance value of the second inductor meets the value range of the matching inductor.
In detail, in step S1, an ultrasonic scalpel system as shown in fig. 3 and 4 is provided, where the ultrasonic scalpel system includes an ultrasonic scalpel main body 16, an ultrasonic transducer 17, and an ultrasonic scalpel head 18, an output signal of the ultrasonic scalpel main body 16 is converted by the ultrasonic transducer 17 and then loaded on the ultrasonic scalpel head 18, the ultrasonic scalpel main body 16 includes a transducer matching circuit 6, and the transducer matching circuit 6 can provide a plurality of inductances with different inductance values for the ultrasonic transducer 17.
In detail, in step S2, the ultrasonic blade host 16 is started, and after the ultrasonic blade host 16 is powered on, the digital signal processor 1 randomly selects an inductor (denoted as a first inductor) in the transducer matching circuit 6 to access the ultrasonic transducer 17, and performs a self-test; during self-checking, the digital signal processor 1 controls the waveform generator 3 (and the digital-to-analog converter 4) to output a first frequency signal to the ultrasonic transducer 17, wherein the frequency of the first frequency signal is smaller than and far smaller than the resonant frequency of the ultrasonic blade system (for example, for the ultrasonic blade system with the working frequency of 55KHz to 56KHz, the frequency of the first frequency signal can be 20KHz to 30 KHz).
In detail, in step S3, the voltage sampling and converting module 7 is used to detect the output voltage of the ultrasonic blade host 16, the current sampling and converting module 8 is used to detect the output current of the ultrasonic blade host 16, that is, the voltage and the current of the first frequency signal are detected, and then the programmable logic module 2 is used to calculate the impedance of the ultrasonic transducer 17 according to the output voltage and the output current.
In detail, in step S4, since the frequency of the first frequency signal is much smaller than the resonant frequency of the ultrasonic blade system, as shown in fig. 1, the impedance of the series circuit of the ultrasonic transducer 17 is very large, and the influence on the parallel impedance of the matching inductor and the static capacitor is very small, and the calculated impedance is similar to the parallel impedance of the matching inductor and the static capacitor; thus, in the case where the matching inductance (first inductance) and the impedance (calculated by the programmable logic module 2) are both known quantities, the static capacitance of the ultrasonic transducer can be obtained by the following calculation:
wherein, C0Represents the static capacitance of the ultrasonic transducer 17, Z represents the impedance, L0Representing the first inductance, ωz＝2πfz，ωzRepresenting the angular frequency, f, of the first frequency signalzRepresenting the frequency of the first frequency signal.
In detail, in step S5, the static capacitance C is known0And the operating frequency range of the ultrasonic blade system according to the parallel resonance formula
Calculating the value range of the matching inductance, wherein L0Representing the matching inductance, ω0＝2πf0，f0The working frequency of the ultrasonic knife system is shown, and the value of the working frequency is within a certain range, such as 55 KHz-56 KHz.
Optionally, the static capacitance C of the ultrasonic transducer 170And the calculation of the value range of the matching inductance can be done in the digital signal processor 1.
In detail, in step S6, the digital signal processor 1 refers to the inductance values of the plurality of inductances provided by the transducer matching circuit 6 and selects a second inductance that satisfies the value range of the matching inductance, and then the digital signal processor 1 controls the transducer matching circuit 6 to connect the second inductance to the ultrasonic transducer 17.
In more detail, in step S6, if a plurality of inductors in the transducer matching circuit 6 all satisfy the value range of the matching inductor, a most suitable inductor (e.g., the inductor is centered) is selected from the plurality of inductors as the second inductor and matched with the ultrasonic transducer 17, and the second inductor is successfully matched; if only one inductor in the transducer matching circuit 6 meets the value range of the matching inductor, the inductor is selected as a second inductor and matched into the ultrasonic transducer 17, and the second inductor is successfully matched; if no inductance in the transducer matching circuit 6 meets the value range of the matching inductance, the second inductance matching fails.
In more detail, if the second inductor is successfully matched, the whole ultrasonic scalpel system can start to be normally started and work; if the second inductor meeting the value range of the matching inductor does not exist in the transducer matching circuit 6, that is, the matching of the second inductor fails, it is indicated that the ultrasonic transducer 17 has aged seriously and the static capacitance is large, and the ultrasonic transducer 17 needs to be replaced, and the steps are repeated to select the appropriate matching inductor after the ultrasonic transducer 17 is replaced.
In summary, in the technical scheme for automatically matching the impedance of the transducer of the ultrasonic blade system provided by the invention, the real-time static capacitance of the ultrasonic transducer is obtained through calculation, the value range of the matched inductance is obtained through calculation in combination with the working frequency range (also the resonant frequency variation range) of the ultrasonic blade system, and then a proper inductance is selected from the transducer matching circuit to be connected to the ultrasonic transducer, so that the inductance value of the matched inductance can be dynamically adjusted according to the static capacitance of the ultrasonic transducer and the variation of the working frequency range of the ultrasonic blade system, the maximum matching is realized, and the ultrasonic transducer works in the optimal state; in addition, if the matching of the inductors fails, the ultrasonic transducer is aged seriously and may not work normally, the inductors need to be matched again after the ultrasonic transducer is replaced, the matching of the ultrasonic transducer and the matched inductors is further ensured to the maximum extent through indirect inspection of the working state of the ultrasonic transducer, and the working efficiency of the ultrasonic transducer is improved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (11)
1. An ultrasonic blade main unit, comprising: the device comprises a digital signal processor, a programmable logic module, a waveform generator, a digital-to-analog converter, a power amplification circuit, a transducer matching circuit, a voltage sampling conversion module and a current sampling conversion module; the digital signal processor is connected with the waveform generator, the waveform generator is connected with the input end of the power amplifying circuit, the digital signal processor is connected with the digital-to-analog converter, the digital-to-analog converter is connected with the input end of the power amplifying circuit, the output end of the power amplifying circuit is connected with the transducer matching circuit, the digital signal processor is connected with the transducer matching circuit, and the digital signal processor adjusts and controls the inductance provided by the transducer matching circuit;
the output end of the power amplifying circuit is connected with the voltage sampling conversion module, the voltage sampling conversion module is connected with the programmable logic module, the output end of the power amplifying circuit is connected with the current sampling conversion module, the current sampling conversion module is connected with the programmable logic module, and the programmable logic module is connected with the digital signal processor;
the programmable logic module calculates the impedance of an external ultrasonic transducer according to the output voltage and the output current, the digital signal processor calculates the static capacitance of the ultrasonic transducer according to the impedance and calculates the value range of the matching inductance of the ultrasonic transducer according to the static capacitance, and the digital signal processor automatically connects the inductance in the transducer matching circuit to the ultrasonic transducer in a matching way according to the value range of the matching inductance;
wherein the digital signal processor calculates the static capacitance of the ultrasonic transducer according to the following formula:
in the above formula, C0Representing the static capacitance of the ultrasonic transducer, Z representing the impedance of the ultrasonic transducer, L0Representing the inductance, ω, provided by the transducer matching circuitz＝2πfz，ωZRepresenting the angular frequency, f, of the output signal of the waveform generatorZRepresenting a frequency of the waveform generator output signal;
and the digital signal processor calculates the value range of the matching inductance according to the static capacitance and the working frequency range of the ultrasonic knife host and a parallel resonance formula.
2. The ultrasonic scalpel host of claim 1, wherein the transducer matching circuit comprises a chip selection chip and a plurality of inductors with different inductance values, each selection channel of the chip selection chip is connected with one inductor in series, a control terminal of the chip selection chip is connected with the digital signal processor, and output terminals of the chip selection chip are respectively connected with the ultrasonic transducer and the output terminal of the power amplification circuit.
3. The ultrasonic blade host machine according to claim 1 or 2, further comprising a microcontroller, an input module, a display module, an audio playing module and a communication module, wherein the microcontroller is connected with the input module, the display module, the audio playing module and the communication module, respectively, and the microcontroller is further connected with the digital signal processor.
4. The ultrasonic blade host of claim 1, further comprising a switching power supply module, wherein the switching power supply module is connected to the power amplification circuit and provides power to the power amplification circuit.
5. The ultrasonic blade host of claim 1, further comprising a safety detection module, wherein the safety detection module is connected to the output end of the power amplification circuit, the safety detection module is further connected to the programmable logic module, the safety detection module monitors the output voltage and the output current of the power amplification circuit, and feeds back an alarm signal to the programmable logic module when an abnormal condition is found.
6. The ultrasonic blade host computer according to claim 1, wherein the voltage sampling conversion module comprises a voltage sampling unit and a first analog-to-digital conversion unit, an input end of the voltage sampling unit is connected with an output end of the power amplification circuit, an output end of the voltage sampling unit is connected with an input end of the first analog-to-digital conversion unit, and an output end of the first analog-to-digital conversion unit is connected with the programmable logic module; the current sampling conversion module comprises a current sampling unit and a second analog-to-digital conversion unit, wherein the input end of the current sampling unit is connected with the output end of the power amplification circuit, the output end of the current sampling unit is connected with the input end of the second analog-to-digital conversion unit, and the output end of the second analog-to-digital conversion unit is connected with the programmable logic module.
7. An ultrasonic scalpel system, comprising the ultrasonic scalpel host of any one of claims 1-6, further comprising an ultrasonic transducer and an ultrasonic scalpel head, wherein an output terminal of the power amplification circuit is connected to an output terminal of the transducer matching circuit and an input terminal of the ultrasonic transducer, respectively, and an output terminal of the ultrasonic transducer is connected to the ultrasonic scalpel head.
8. The ultrasonic blade system of claim 7, further comprising a gear control module, wherein the gear control module is connected to the digital signal processor, and the gear control module is configured to regulate and control the output energy of the ultrasonic blade main unit.
9. A method for automatically matching the impedance of a transducer of an ultrasonic blade system, comprising the steps of:
providing an ultrasonic knife system, wherein the ultrasonic knife system comprises an ultrasonic knife host and an ultrasonic transducer, the ultrasonic knife host comprises a transducer matching circuit, and the transducer matching circuit can provide a plurality of inductances with different inductance values;
starting the ultrasonic knife host, controlling the transducer matching circuit to connect a first inductor into the ultrasonic transducer, and outputting a first frequency signal to the ultrasonic transducer;
detecting the output voltage and the output current of the ultrasonic knife main machine, and calculating the impedance of the ultrasonic transducer according to the output voltage and the output current;
calculating a static capacitance of the ultrasonic transducer from the first inductance, the frequency of the first frequency signal, and the impedance;
calculating the value range of the matching inductance according to the static capacitance and the working frequency range of the ultrasonic scalpel system and a parallel resonance formula;
controlling the transducer matching circuit to connect a second inductor into the ultrasonic transducer, wherein the inductance value of the second inductor meets the value range of the matching inductor;
wherein, the calculation formula of the static capacitance of the ultrasonic transducer is as follows:
in the above formula, C0Representing the static capacitance of the ultrasonic transducer, Z representing the impedance of the ultrasonic transducer, L0Representing said first inductance, ωz＝2πfz，ωZRepresenting the angular frequency, f, of said first frequency signalZRepresenting the frequency of the first frequency signal.
10. The method of automatically matching the impedance of an ultrasonic blade system transducer according to claim 9, wherein the frequency of the first frequency signal is less than a resonant frequency of the ultrasonic blade system.
11. The method for automatically matching the impedance of an ultrasonic blade system transducer of claim 9, wherein the method for automatically matching the impedance of an ultrasonic blade system transducer further comprises the steps of:
and if the second inductor meeting the value range of the matching inductor does not exist in the transducer matching circuit, repeating the steps after replacing the ultrasonic transducer.
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| CN115318605B (en) * | 2022-07-22 | 2023-09-08 | 东北大学 | Automatic matching method for variable-frequency ultrasonic transducer |
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