CN218075144U - Ultrasonic scalpel system capable of automatically tracking resonant frequency - Google Patents
Ultrasonic scalpel system capable of automatically tracking resonant frequency Download PDFInfo
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- CN218075144U CN218075144U CN202221789205.9U CN202221789205U CN218075144U CN 218075144 U CN218075144 U CN 218075144U CN 202221789205 U CN202221789205 U CN 202221789205U CN 218075144 U CN218075144 U CN 218075144U
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Abstract
The utility model discloses a but automatic tracking resonant frequency's supersound sword system, it includes: the ultrasonic scalpel comprises an ultrasonic scalpel head, an ultrasonic scalpel transducer and an ultrasonic scalpel host, wherein the ultrasonic scalpel head is a pincer-shaped scalpel head and can manually cut tissues; an ultrasonic transducer includes: the piezoelectric ceramic stack, the amplitude transformer and the mass block can generate mechanical vibration with ultrasonic frequency under the excitation of the resonant current of the ultrasonic knife main machine, the vibration efficiency is highest and the amplitude is maximum at the mechanical resonant frequency point, and a vibration source is provided for the ultrasonic knife; the ultrasonic blade host generates a current source for the ultrasonic transducer to operate, comprising: programmable module, digital signal processing module, control module. The utility model has the advantages that: the ultrasonic knife system capable of automatically tracking the resonant frequency is provided, so that the ultrasonic transducer can work in an optimal state; and the resonance frequency of the transducer can be automatically tracked without being influenced by the static capacitance and the load of the ultrasonic transducer.
Description
Technical Field
The utility model belongs to the technical field of the medical treatment, in particular to but ultrasonic knife system of automatic tracking resonant frequency.
Background
The ultrasonic cutting hemostatic scalpel is a common surgical scalpel, has the characteristics of small wound, less smoke, capability of coagulating blood and the like in the operation process, and can be widely applied to surgical operations. The ultrasonic cutting hemostatic knife consists of an ultrasonic knife main machine, an ultrasonic transducer and an ultrasonic knife, and the working principle is that the ultrasonic knife main machine generates a current source with constant ultrasonic frequency and effective value to the ultrasonic transducer, and the ultrasonic transducer is excited to generate mechanical longitudinal vibration of the ultrasonic frequency to drive an ultrasonic knife head to generate mechanical vibration. Because of high frequency and small amplitude, the utility model can cut human tissues with small area.
The equivalent circuit of the ultrasonic transducer is shown in a dashed line frame in fig. 1, wherein L1 is a dynamic inductor, C1 is a dynamic capacitor, R1 is a dynamic resistor, the three components form a series circuit and also a mechanical circuit, and C0 is a static capacitor and is connected in parallel in the circuit. In operation, the ultrasonic blade main body generates a current source at an ultrasonic frequency that minimizes the impedance of the mechanical circuit to achieve maximum efficiency and produces maximum longitudinal amplitude. According to the principle of series resonant circuit, the frequency needs to be satisfied
At the moment, the transducer works in a series resonance state, a series loop is equivalent to only R1, the impedance is minimum, and the efficiency is highest.
Because of the presence of the static capacitance C0, the phase difference between the voltage and the current input to the transducer is not 0 even when the transducer operates at the series resonance frequency, and this phase difference varies depending on the load and the operating frequency. The resonant frequency of the transducer cannot be tracked by the phase difference of the voltage and current.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the purpose is: the ultrasonic knife system can automatically track the resonance frequency, so that the ultrasonic knife system works in a series resonance state, the efficiency is maximum, and the output amplitude is maximum.
The technical scheme of the utility model is that: an ultrasonic blade system capable of automatically tracking a resonant frequency, comprising: the ultrasonic scalpel comprises an ultrasonic scalpel head, an ultrasonic transducer connected with the ultrasonic scalpel head and an ultrasonic scalpel main body connected with the ultrasonic transducer.
On the basis of the technical scheme, the method further comprises the following subsidiary technical scheme:
the ultrasonic knife head is a forceps-shaped blade which can be manually operated to cut tissues;
an ultrasonic transducer includes: the device comprises a piezoelectric ceramic stack, an amplitude transformer connected with the piezoelectric ceramic stack, and a mass block close to the piezoelectric ceramic stack; the ultrasonic knife can generate mechanical vibration with ultrasonic frequency under the excitation of the resonant current of the main machine of the ultrasonic knife, has highest vibration efficiency and maximum amplitude at the mechanical resonant frequency point, and provides a vibration source for the ultrasonic knife.
The ultrasonic blade host generates a current source for the ultrasonic transducer to work, and comprises: the ultrasonic transducer comprises an isolation transformer connected with an ultrasonic transducer, a power amplification circuit connected with the isolation transformer, a voltage sampling module arranged between the isolation transformer and the power amplification circuit and used for providing output voltage sampling, a current sampling module arranged between the isolation transformer and the power amplification circuit and used for providing current and voltage sampling, a safety detection module arranged between the isolation transformer and the power amplification circuit and used for detecting output conditions, a switching power supply module connected with the power amplification circuit, a sinusoidal signal generator connected with the power amplification circuit and a digital signal processing module and used for providing sinusoidal signals, and a digital-to-analog converter connected with the power amplification circuit and the digital signal processing module.
The programmable module calculates voltage and current waveforms sent by the voltage sampling module and the current sampling module and communicates with the digital signal processing module;
the digital signal processing module exchanges data with the programmable module through a communication protocol, outputs the data to the digital-to-analog converter according to the calculation result of the programmable module, communicates with the control module at the same time, and sends or receives a corresponding command to the peripheral;
the control module controls external interfaces and interfaces, including: sound unit, communication unit, LCD display, input device.
The utility model has the advantages that: the ultrasonic knife system capable of automatically tracking the resonance frequency is provided, so that the ultrasonic transducer can work in an optimal state; and the resonance frequency of the transducer can be automatically tracked without being influenced by the static capacitance and the load of the ultrasonic transducer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is an equivalent circuit diagram of a prior art ultrasonic transducer;
fig. 2 is an equivalent circuit diagram of the ultrasonic transducer of the present invention;
fig. 3 is a schematic structural diagram of the ultrasonic scalpel system of the present invention;
FIG. 4 is a structural diagram of the ultrasonic scalpel system based on maximum current tracking of the present invention;
fig. 5 is a flowchart of the procedure of the present invention.
Detailed Description
Example (b): referring to fig. 2-3, embodiments of an ultrasonic blade system with automatic tracking of resonant frequency are disclosed, comprising: the ultrasonic scalpel comprises an ultrasonic scalpel head 1, an ultrasonic transducer 2 connected with the ultrasonic scalpel head 1 and an ultrasonic scalpel host 3 connected with the ultrasonic transducer 2.
The ultrasonic blade head 1 is a forceps-shaped blade which can be manually operated to cut tissue.
The ultrasonic transducer 2 includes: the device comprises a piezoelectric ceramic stack, an amplitude transformer connected with the piezoelectric ceramic stack, and a mass block close to the piezoelectric ceramic stack; the ultrasonic knife main machine 3 can generate mechanical vibration with ultrasonic frequency under the excitation of resonant current, has highest vibration efficiency and maximum amplitude at the mechanical resonant frequency point, and provides a vibration source for the ultrasonic knife 1.
The ultrasonic blade main unit 3 generates a current source for the ultrasonic transducer 2 to operate, and includes: the ultrasonic transducer comprises a programmable module 4, a digital signal processing module 5 connected with the programmable module 4 in a communication mode, a control module 6 connected with the digital signal processing module 5, an isolation transformer 7 connected with the ultrasonic transducer 2, a power amplification circuit 8 connected with the isolation transformer, a voltage sampling module 9 arranged between the isolation transformer 7 and the power amplification circuit 8 and providing output voltage sampling, a current sampling module 10 arranged between the isolation transformer 7 and the power amplification circuit 8 and providing current and voltage sampling, a safety detection module 11 arranged between the isolation transformer 7 and the power amplification circuit 8 and detecting output conditions, a switching power supply module 12 connected with the power amplification circuit 8, a sine signal generator 13 connected with the power amplification circuit 8 and the digital signal processing module 5 and providing sine wave signals, and a digital-to-analog converter 14 connected with the power amplification circuit 8 and the digital signal processing module 5.
The programmable module 4 performs high-speed calculation, calculates voltage and current waveforms transmitted by the voltage sampling module 9 and the current sampling module 10, calculates phases, voltage values, current values, power values, impedance values and the like, and communicates with the digital signal processing module 5;
the digital signal processing module 5 exchanges data with the programmable module 4 through a communication protocol, outputs the data to a digital-to-analog converter 14 for controlling the ultrasonic output amplitude and the power voltage output amplitude according to the calculation result of the programmable module 4, communicates with the control module 6, and sends or receives a corresponding command to an external device;
the control module 6 controls external interfaces and interfaces, including: a sound unit 15, a communication unit 16, an LCD display 17, an input device 18.
The digital signal processing module 5 is communicated with the sine signal generator 13 to generate sine wave signals of ultrasonic frequency, the sine wave signals are input to the power amplifying circuit, the switching power supply module 12 provides power supply energy for the power amplifying circuit 8, the power amplifying circuit 8 outputs a current source required by the ultrasonic transducer 2, the ultrasonic transducer 2 generates mechanical vibration, and the mechanical vibration is transmitted to the ultrasonic cutter head 1 to cut human tissues. A certain load is generated in the cutting process of the ultrasonic knife head 1, the load is transmitted to a power output loop through an equivalent circuit and a matching circuit of the ultrasonic transducer 2, a voltage and current sample is set and transmitted to the programmable module 4, the current and the voltage are calculated, the phase positions of the voltage and the voltage are also calculated, the impedance is calculated through the voltage and the current, the impedance is transmitted to the digital signal processing module 5 through the calculation result, the digital signal processing module 5 calculates the resonant frequency of the ultrasonic transducer 2 according to feedback parameters, the output frequency is adjusted through the sine signal generator, and the output power is adjusted through the digital-to-analog converter 14, so that a feedback system is formed. During the operation of the ultrasonic blade, the ultrasonic transducer 2 is continuously output and fed back in such a way that the ultrasonic transducer operates in a series resonance state.
As the ultrasonic blade cuts tissue, the load is variable; the static capacitance C0 of the ultrasonic transducer 2 is not a fixed value, the static capacitances C0 of the ultrasonic transducers 2 in different batches are different, and the static capacitance C0 of the ultrasonic transducer 2 changes with the temperature rise of the ultrasonic transducer during the operation of the ultrasonic scalpel system, so that the ultrasonic scalpel host 3 needs to have an algorithm to adjust the frequency of the resonant current in real time to enable the ultrasonic transducer 2 to operate in a resonant state all the time during the tissue cutting process of the ultrasonic scalpel system.
The working principle of the algorithm is as follows: when the ultrasonic transducer 2 is in the series resonance state, the equivalent circuit is as shown in fig. 2, the load is connected in parallel with the static capacitor C0, the impedance is minimum, and the resonance current of the ultrasonic transducer 2 also reaches the maximum value, that is, when the series resonance occurs, the current at both ends of the ultrasonic transducer 2 is maximum. Based on this, a principle of tracking the resonance frequency by a method of tracking the resonance current of the ultrasonic transducer 2, that is, tracking the resonance frequency by the maximum current method is formed.
The structure of the ultrasonic knife system based on maximum current method tracking is shown in figure 4. The resonant current is transmitted to the programmable module 4 through the current sampling module 10, the programmable module 4 compares the previous current value to determine a new working frequency, the output frequency of the sinusoidal signal generator 13 is changed, the output signal of the sinusoidal signal generator 13 is transmitted to the power amplifying circuit 8 through the driving circuit, so that the working frequency of the ultrasonic transducer 2 is changed until the frequency corresponding to the maximum current is found, namely the series resonant frequency of the ultrasonic transducer 2.
The current value comparison flow of programmable module 4 is shown in fig. 5:
the shift range of the resonance frequency during the operation of the ultrasonic transducer 2 is about 53.5KHz-56.5KHz, and the initial frequency of the ultrasonic transducer 2 is set to 55.5KHz. Before the ultrasonic scalpel system starts to work, a threshold value of a resonant current variation range is set to be delta I, when the resonant current at two ends of the ultrasonic transducer 2 does not exceed I +/-delta I, frequency tracking is not started, and when the resonant current at two ends of the ultrasonic transducer 2 exceeds I +/-delta I, frequency tracking is started. Firstly, carrying out coarse frequency adjustment, wherein the frequency is changed towards the increasing direction, and the frequency change step is 50Hz; when the scanning frequency exceeds 56.5KHz, the scanning frequency is changed to 54.5KHz, and the frequency sweeping is continued. Finding that the current value satisfies the relation I 1 <I 2 And I is 2 >I 3 Corresponding frequency f 1 ,f 3 Then the resonant frequency must satisfy f 1 <f 2 <f 3 . Then continuing the frequency fine tuning at f 1 ～f 3 Within the range, the frequency is changed by step length 4Hz until the value of the resonance current is found to satisfy the relation I' 1 <I' 2 And I' 2 >I' 3 Then current I' 2 The corresponding frequency is the transducer series resonant frequency.
The utility model has the advantages that: the ultrasonic knife system capable of automatically tracking the resonant frequency is provided, so that the ultrasonic transducer can work in an optimal state; and the resonance frequency of the transducer can be automatically tracked without being influenced by the static capacitance and the load of the ultrasonic transducer.
It should be understood that the above-mentioned embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and the protection scope of the present invention cannot be limited thereby. All equivalent changes or modifications made according to the spirit of the main technical scheme of the invention should be covered in the protection scope of the invention.
Claims (7)
1. An ultrasonic blade system capable of automatically tracking a resonant frequency, comprising: the ultrasonic scalpel comprises an ultrasonic scalpel head (1), an ultrasonic transducer (2) connected with the ultrasonic scalpel head (1), and an ultrasonic scalpel host (3) connected with the ultrasonic transducer (2);
the ultrasonic transducer (2) comprises: the piezoelectric ceramic stack, the amplitude transformer connected with the piezoelectric ceramic stack and the mass block close to the piezoelectric ceramic stack are arranged on the piezoelectric ceramic stack;
the ultrasonic scalpel main body (3) comprises: the device comprises a programmable module (4), a digital signal processing module (5) in communication connection with the programmable module (4), and a control module (6) connected with the digital signal processing module (5);
when the ultrasonic transducer (2) is in a series resonance state, the dynamic inductor (L1) and the dynamic capacitor (C1) are equivalent to a short circuit state, the dynamic resistor (R1) is connected with the static capacitor (C0) in parallel, the impedance is reduced, the resonance current of the ultrasonic transducer (2) is increased, and namely when the series resonance occurs, the current at two ends of the ultrasonic transducer (2) reaches a peak value.
2. The ultrasonic blade system capable of automatically tracking a resonant frequency of claim 1, wherein: the ultrasonic knife main machine (3) further comprises: the ultrasonic transducer comprises an isolation transformer (7) connected with an ultrasonic transducer, a power amplification circuit (8) connected with the isolation transformer, a voltage sampling module (9) arranged between the isolation transformer (7) and the power amplification circuit (8) and providing output voltage sampling, a current sampling module (10) arranged between the isolation transformer (7) and the power amplification circuit (8) and providing current and voltage sampling, a safety detection module (11) arranged between the isolation transformer (7) and the power amplification circuit (8) and detecting output conditions, a switching power supply module (12) connected with the power amplification circuit (8), a sine signal generator (13) connected with the power amplification circuit (8) and a digital signal processing module (5) and providing sine wave signals, and a digital-to-analog converter (14) connected with the power amplification circuit (8) and the digital signal processing module (5).
3. The ultrasonic blade system capable of automatically tracking a resonant frequency of claim 1, wherein: the ultrasonic knife head (1) is a pincer-shaped blade capable of manually cutting tissues.
4. The ultrasonic blade system capable of automatically tracking a resonant frequency of claim 1, wherein: the ultrasonic knife main machine (3) provides a current source for the ultrasonic transducer (2) to work.
5. The ultrasonic blade system capable of automatically tracking a resonant frequency of claim 1, wherein: the programmable module (4) calculates the voltage and current waveforms sent by the voltage sampling module (9) and the current sampling module (10) and communicates with the digital signal processing module (5).
6. The ultrasonic blade system capable of automatically tracking a resonant frequency of claim 1, wherein: the digital signal processing module (5) and the programmable module (4) exchange data through a communication protocol, the data are output to the digital-to-analog converter (14) according to the calculation result of the programmable module (4), and meanwhile, the digital signal processing module communicates with the control module (6) and sends or receives corresponding commands to the peripheral equipment.
7. The ultrasonic blade system capable of automatically tracking a resonant frequency of claim 1, wherein: the control module (6) controls external interfaces and interfaces, including: the device comprises a sound unit (15), a communication unit (16), an LCD display (17) and an input device (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221789205.9U CN218075144U (en) | 2022-07-12 | 2022-07-12 | Ultrasonic scalpel system capable of automatically tracking resonant frequency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221789205.9U CN218075144U (en) | 2022-07-12 | 2022-07-12 | Ultrasonic scalpel system capable of automatically tracking resonant frequency |
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| CN202221789205.9U Active CN218075144U (en) | 2022-07-12 | 2022-07-12 | Ultrasonic scalpel system capable of automatically tracking resonant frequency |
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