CN112754605B - Ultrasonic knife host, ultrasonic knife system and automatic adjustment method for impedance of transducer of ultrasonic knife system - Google Patents
Ultrasonic knife host, ultrasonic knife system and automatic adjustment method for impedance of transducer of ultrasonic knife system Download PDFInfo
- Publication number
- CN112754605B CN112754605B CN201911069992.2A CN201911069992A CN112754605B CN 112754605 B CN112754605 B CN 112754605B CN 201911069992 A CN201911069992 A CN 201911069992A CN 112754605 B CN112754605 B CN 112754605B
- Authority
- CN
- China
- Prior art keywords
- ultrasonic
- transducer
- ultrasonic transducer
- module
- inductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- 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
- A61B2017/320082—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic for incising tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/04—Constructional details of apparatus
- A61B2560/0443—Modular apparatus
Abstract
The invention provides an ultrasonic knife host, an ultrasonic knife system and an automatic adjustment method of the impedance of an energy converter of the ultrasonic knife system, wherein the ultrasonic knife system calculates the static capacitance of an ultrasonic energy converter according to real-time temperature fitting, then calculates the value range of a matched inductor by combining with the working frequency range of the ultrasonic knife system, and finally selects a proper inductor from an energy converter matching circuit to be connected into the ultrasonic energy converter, so that the inductance value of the matched inductor can be dynamically adjusted according to the static capacitance of the ultrasonic energy converter and the change of the working frequency range of the ultrasonic knife system, the maximum matching is realized, and the ultrasonic energy converter works in the optimal state; in addition, if the matching of the inductors fails, the temperature of the ultrasonic transducer is too high or the ultrasonic transducer is seriously aged, the ultrasonic transducer may not work normally, the inductors need to be matched again after the ultrasonic transducer is replaced, the maximum matching of the ultrasonic transducer and the matched inductors is further ensured 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 adjusting method for a transducer of the ultrasonic knife system.
Background
An ultrasonic knife (ultrasonic cutting hemostatic knife) is a common surgical knife, 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 scalpel (system) consists of an ultrasonic scalpel host, an ultrasonic transducer and an ultrasonic scalpel head, and the working principle is that the ultrasonic scalpel host generates a power source with a certain frequency to the ultrasonic transducer, the ultrasonic transducer generates mechanical vibration with the frequency and drives the ultrasonic scalpel head to also generate mechanical vibration, and the ultrasonic scalpel (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, L 1 Is a dynamic inductor, C 1 Is a dynamic capacitor, R 1 The three are dynamic resistors, form a series circuit and also are mechanical circuits, and can change according to different loads; c 0 The static capacitor, namely the capacitor in a static state, is connected in parallel in the circuit. In operation, the ultrasonic blade main body generates a power supply with a frequency that is required to enable the ultrasonic blade main body to generateThe mechanical circuit reaches a minimum impedance 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 R 1 The impedance is minimum and the efficiency is highest. But because of the static capacitance C 0 The 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 C 0 Cannot be eliminated, and it is common practice to use a fixed inductor L 0 Connected in parallel or in series in a loop (as shown in fig. 1 and 2) to make the inductor L 0 And a static capacitance C 0 The working is in a resonance state under the current working frequency, thereby meeting the requirements
Due to static capacitance C 0 Relatively fixed, so only one proper inductance L needs to be selected 0 Matching with it, the purpose can be achieved.
However, in the working process of the ultrasonic knife 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 knife system is 55 KHz-56 KHz; meanwhile, in the continuous working process, part of the power of the ultrasonic transducer is converted into heat, and the temperature rise of the ultrasonic transducer causes static capacitance C 0 Is increased. According to the formula of parallel resonance
Wherein, ω is 0 ＝2πf 0 Frequency f of ultrasonic signal 0 And a static capacitance C 0 Can all change the inductance L 0 Thus fixing the value of the inductance L 0 The inductance L is not necessarily made 0 And a static capacitor C 0 When the circuit is operated in the resonance state, the impedance is large when the circuit is not in the resonance state, and the influence on the impedance of the series resonant circuit is small, butIf the ultrasonic blade system is operated in a high impedance environment, such as when cutting hard tissue, the impedance will be large, and the inductance L will be large 0 And a static capacitor C 0 The impedance of the loop may have an effect on the impedance of the series loop and even 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 adjustment solution for the impedance of a transducer of an ultrasonic blade system, which is used to solve 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.
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 transducer matching circuit includes an adjustable inductor, a control terminal of the adjustable inductor is connected to the digital signal processor, and an output terminal of the adjustable inductor is connected to the output terminals of the ultrasonic transducer and the power amplifying circuit, respectively.
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 includes a switching power supply module, and the switching power supply module is connected to the power amplification circuit and supplies power to 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, an ultrasonic scalpel head, and a temperature sensor, 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, an output terminal of the ultrasonic transducer is connected to the ultrasonic scalpel head, the temperature sensor is disposed in the ultrasonic transducer, and the temperature sensor is connected to the digital signal processor.
In addition, to achieve the above and other related objects, the present invention provides a method for automatically adjusting 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, an ultrasonic transducer and a temperature sensor, the ultrasonic knife host comprises a transducer matching circuit, and the transducer matching circuit can provide a plurality of inductances with different inductance values;
the ultrasonic knife host is started, the transducer matching circuit is controlled to connect a first inductor into the ultrasonic transducer, and a first signal is output to the ultrasonic transducer;
when the ultrasonic transducer works, acquiring the real-time temperature of the ultrasonic transducer through the temperature sensor;
calculating the static capacitance of the ultrasonic transducer by utilizing a fitting curve formula of the static capacitance and the temperature according to the real-time temperature of the ultrasonic transducer;
calculating the value range of the matching inductance according to the static capacitance and the working frequency range of the ultrasonic scalpel system;
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 fitting curve formula of the static capacitance and the temperature is as follows:
C 0 ＝a n T n +a n-1 T n-1 +a n-2 T n-2 +…+a 1 T+a 0 ；
wherein, C 0 Representing a static capacitance of the ultrasound transducer; a is a n 、a n-1 、a n-2 、…、a 1 、a 0 The coefficient representing the fitting curve is obtained by calibration calculation when the ultrasonic transducer leaves a factory; n is a positive integer, and T represents the temperature of the ultrasonic transducer.
Optionally, the method for automatically adjusting 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, and the calculation control of the digital signal processor is combined, the value range of the matching inductance can be obtained through the calculation of the real-time static capacitance of the external ultrasonic transducer and the working frequency range 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 changes of the static capacitance of the ultrasonic transducer and 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 the automatic adjustment of the impedance of the transducer of the ultrasonic blade system in an embodiment of the present invention.
Fig. 6 shows a fitted curve of static capacitance and temperature of the ultrasonic transducer in an embodiment of the present invention.
Description of the reference numerals
1. Digital signal processor
2. Programmable logic module
3. Waveform generator
4. Digital-to-analog converter
5. Power amplifying circuit
6. Transducer matching circuit
7. Voltage sampling conversion module
8. Current sampling conversion module
9. Safety detection module
10. Switch power supply module
11. Micro-controller
12. Input module
13. Display module
14. Audio playing module
15. Communication module
16. Ultrasonic knife main unit
17. Ultrasonic transducer
18. Ultrasonic knife head
19. Temperature sensor
C 0 Static capacitor
C 1 Dynamic capacitor
L 0 、L 0-1 、L 0-2 、L 0-3 、L 0-4 Inductance
L 1 Dynamic inductor
R 1 Dynamic resistance
S 1 、S 2 、S 3 、S 4 Switch with a switch body
V voltage source (output signal) provided by ultrasonic knife main machine
Detailed Description
As mentioned in the foregoing background, since the resonance frequency of the ultrasonic blade system is not fixed but fluctuates within a certain range; during the continuous operation of the ultrasonic transducer, a part of power is converted into heat, and the temperature rise of the ultrasonic transducer causes a static capacitance C 0 Is increased. According to the formula of parallel resonance
If a fixed value of inductance L is connected to the ultrasonic transducer 0 It is not necessary to make the inductance L 0 And a static capacitance C 0 Operating in resonance, inductance L 0 And a static capacitance C 0 The 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 adjustment technical scheme of the impedance of an energy transducer of an ultrasonic knife system, which comprises the steps of firstly connecting a first inductor to an ultrasonic transducer and outputting a first signal to the ultrasonic transducer; secondly, acquiring the real-time temperature of the ultrasonic transducer when the ultrasonic transducer works, and fitting and calculating the static capacitance of the ultrasonic transducer according to the real-time temperature; 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 into the ultrasonic transducer.
According to the technical scheme for automatically adjusting the impedance of the transducer of the ultrasonic knife system, the real-time static capacitance of the ultrasonic transducer is calculated through real-time temperature fitting of the ultrasonic transducer, the working frequency range (also a resonance frequency variation range) of the ultrasonic knife system is combined, the value range of the matched inductance is calculated, 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 matched inductance can be dynamically adjusted effectively according to the static capacitance of the ultrasonic transducer and the variation 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 following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. 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 6. It should be noted that the drawings provided in this embodiment are only for schematically illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings and not drawn according to the number, shape and size of the components in actual implementation, and the form, quantity and proportion of each component in actual implementation may be arbitrarily changed, and the component layout may be more complicated. The structures, the proportions, the sizes, and the like shown in the drawings attached to the present specification are only used for matching with the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes of the proportion relation, or adjustment of the size, should fall within the scope of the technical disclosure of the present invention without affecting the efficacy and the achievable purpose of the present invention.
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 the voltage sampling conversion module 7, the voltage sampling conversion module 7 is connected with the programmable logic module 2, the output end of the power amplifying circuit 5 is connected with the 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 the digital signal processor 1.
Wherein, the digital signal processor 1 comprises a programmable digital signal processor, such as a monolithic signal processor or a very large scale integrated circuit (VLSI) array processor; 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 sine wave amplifier.
Alternatively, as shown in FIG. 4, the transducer matching circuit 6 includes a chip select chip (e.g., a dedicated chip select chip 74HS 138) and a plurality of inductors (e.g., L) with different inductance values 0-1 、L 0-2 、L 0-3 、L 0-4 Etc.), 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 、S 2 、S 3 、S 4 ) 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 only closes one switch at a time, and only one inductor is connected into the circuit at a 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 to an output end of the power amplification circuit 5, an output end of the current sampling unit is connected to 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 to 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 an 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 an output voltage and an output current of the power amplification circuit 5, and an alarm signal is fed back to the programmable logic module 2 when an abnormal condition is found.
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 a common embedded micro-controller, such as an advanced RISC machine ARM, a TI DSP, a silicon graphics MIPS, IBM and Motorola Power PCs, intel x86 and i960 chips, AMD Am386EM, hitachi SH RISC chips, and the like; 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 the power amplifying circuit generates the power required by the ultrasonic transducer through the switching power module 10, so as to generate mechanical vibration on the ultrasonic transducer, and transmit the mechanical vibration to the ultrasonic blade for cutting 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 here, sampling and analog-to-digital conversion are carried out on output current and voltage, then the output current and voltage are transmitted to a programmable logic module 2, the programmable logic module 2 calculates the output current, the output voltage, the output current phase, the output voltage phase, corresponding impedance (calculated according to the output current and the output voltage), power 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, so that 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 current signal and the voltage signal, and if the fed back current signal and the fed back voltage signal have a phase difference, the ultrasonic transducer presents a capacitive or inductive load, so the frequency of the output signal must be adjusted to reduce the phase difference between the two signals, and the phase difference between the output voltage and the output current is close to zero, so that the ultrasonic transducer operates in a resonance state.
In addition, because 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 during the continuous operation of the ultrasonic transducer, a part of the power is converted into heat, and the temperature of the ultrasonic transducer is increasedThe increase in the capacitance will cause static capacitance C 0 Is increased. 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 6 0 To better match the static capacitance C 0 And the change in 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, an ultrasonic scalpel head 18 and a temperature sensor 19, 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, an output end of the ultrasonic transducer 17 is connected to the ultrasonic scalpel head 18, the temperature sensor 19 is disposed in the ultrasonic transducer 17 to acquire a real-time temperature of the ultrasonic transducer 17, and the temperature sensor 19 is connected to the digital signal processor 1.
The ultrasonic transducer 17 includes piezoelectric ceramics, and converts electrical energy (output signal) provided by the ultrasonic blade main unit 16 into mechanical energy of vibration, generates mechanical vibration in a certain frequency range, and provides a vibration source for the ultrasonic blade 18 at a mechanical resonance frequency point with the highest vibration efficiency.
Optionally, the ultrasonic scalpel system further comprises a gear control module, the gear control module is connected with the digital signal processor 1, and the gear control module is used for adjusting and controlling the output energy of the ultrasonic scalpel main unit 16.
In detail, the ultrasonic blade host 16 automatically adjusts the matching inductance for the ultrasonic transducer 17 according to the feedback output: the digital signal processor 1 calculates the static capacitance of the ultrasonic transducer 17 according to the real-time temperature fitting of the ultrasonic transducer 17 acquired by the temperature sensor 19, calculates the value range of the matching inductance of the ultrasonic transducer 17 according to the static capacitance of the ultrasonic transducer 17, and automatically connects the inductance in the transducer matching circuit 6 to the ultrasonic transducer 17 according to the value range of the matching inductance.
In more detail, the process of the ultrasonic-blade host 16 automatically adjusting the inductance for the ultrasonic transducer 17 may refer to an automatic adjustment 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, wherein as shown in fig. 3 and 4, the ultrasonic scalpel system comprises an ultrasonic scalpel host 16, an ultrasonic transducer 17 and a temperature sensor 19, wherein the ultrasonic scalpel host 16 comprises a transducer matching circuit 6, and the transducer matching circuit 6 can provide a plurality of inductors with different inductance values;
s2, starting the ultrasonic knife host 16, controlling the transducer matching circuit 6 to connect the first inductor to the ultrasonic transducer 17, and outputting a first signal to the ultrasonic transducer 17;
s3, when the ultrasonic transducer 17 works, acquiring the real-time temperature of the ultrasonic transducer 17 through the temperature sensor 19;
s4, according to the real-time temperature of the ultrasonic transducer 17, calculating the static capacitance C of the ultrasonic transducer 17 by using a fitting curve formula of the static capacitance and the temperature 0 ；
S5, according to the static capacitance C 0 And 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 into 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, the ultrasonic scalpel system includes an ultrasonic scalpel host 16, an ultrasonic transducer 17, an ultrasonic scalpel head 18 and a temperature sensor 19, an output signal of the ultrasonic scalpel host 16 is converted by the ultrasonic transducer 17 and then loaded on the ultrasonic scalpel head 18, the ultrasonic scalpel host 16 includes a transducer matching circuit 6, the transducer matching circuit 6 can provide a plurality of inductances with different inductance values for the ultrasonic transducer 17, and the temperature sensor is disposed in the ultrasonic transducer 17 and connected to the digital signal processor 1 in the ultrasonic scalpel host 16.
In detail, in step S2, the ultrasonic blade main unit 16 is started, after the ultrasonic blade main unit 16 is powered on, one inductor (marked as a first inductor) in the transducer matching circuit 6 is selectively connected to the ultrasonic transducer 17 through the digital signal processor 1, and simultaneously, the digital signal processor 1 controls the waveform generator 3 (and the digital-to-analog converter 4) to output a first signal to the ultrasonic transducer 17, so that the ultrasonic transducer 17 enters an operating state.
In detail, in step S3, after the ultrasonic transducer 17 is operated for a period of time, the temperature sensor 19 is used to acquire the real-time temperature of the ultrasonic transducer 17 and feed back the temperature data to the digital signal processor 1.
In detail, in step S4, the digital signal processor 1 calculates the static capacitance C of the ultrasonic transducer 17 by using a static capacitance-temperature fitting curve formula according to the real-time temperature data of the ultrasonic transducer 17 fed back 0 ：
C 0 ＝a n T n +a n-1 T n-1 +a n-2 T n-2 +…+a 1 T+a 0 ；
Wherein, C 0 Represents the static capacitance of the ultrasonic transducer 17; a is n 、a n-1 、a n-2 、…、a 1 、a 0 A coefficient representing the fitting curve, which is obtained by calibration calculation when the ultrasonic transducer 17 leaves the factory and then input to the digital signal processor 1, as shown in fig. 6, is a fitting curve of the static capacitance and the temperature calibrated in an embodiment of the present invention; n is a positive integer, and T represents the temperature of the ultrasonic transducer 17.
In detail, in step S5, the static capacitance C is known 0 And the operating frequency range of the ultrasonic blade system according to the parallel resonance formula
Calculating the value range of the matching inductance, wherein L 0 Representing the matching inductance, ω 0 ＝2πf 0 ，f 0 The 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.
In detail, in step S6, the digital signal processor 1 refers to the inductance values of the plurality of inductors provided by the transducer matching circuit 6 and selects a second inductor that satisfies the value range of the matching inductor, and then the digital signal processor 1 controls the transducer matching circuit 6 to connect the second inductor to the ultrasonic transducer 17.
Wherein the static capacitance C of the ultrasonic transducer 17 0 And matching inductanceThe calculation process of the value range can be done in the digital signal processor 1.
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 inductance value is centered) is selected from the plurality of inductors and is used as the second inductor, and the second inductor is matched with the ultrasonic transducer 17, so that 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 indicates that the temperature of the ultrasonic transducer 17 is high, or the ultrasonic transducer 17 has aged seriously, the static capacitance is large, 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 adjusting the impedance of the transducer of the ultrasonic blade system provided by the invention, the real-time temperature of the ultrasonic transducer is acquired through the temperature sensor, the real-time static capacitance of the ultrasonic transducer is calculated according to the real-time temperature fitting of the ultrasonic transducer, the value range of the matching inductance is calculated by combining with the working frequency range (also the resonant frequency variation range) of the ultrasonic blade system, and finally, a proper inductance is selected from the transducer matching circuit to be connected to the ultrasonic transducer, so that the inductance value of the matching 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 inductor fails, the temperature of the ultrasonic transducer is too high or the ultrasonic transducer is seriously aged, the ultrasonic transducer may not work normally, the inductor needs to be matched again after the ultrasonic transducer is replaced, the matching of the ultrasonic transducer and the matched inductor to the maximum extent is further ensured 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 (10)
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 digital signal processor also calculates the static capacitance of the ultrasonic transducer according to the real-time temperature fitting of the ultrasonic transducer acquired by the temperature sensor, calculates the value range of the matching inductance of the ultrasonic transducer according to the static capacitance of the ultrasonic transducer, and accesses the inductance in the transducer matching circuit into the ultrasonic transducer according to the value range of the matching inductance;
the fitting curve formula of the static capacitance and the temperature is as follows:
C 0 ＝a n T n +a n-1 T n-1 +a n-2 T n-2 +…+a 1 T+a 0 ；
wherein, C 0 Representing a static capacitance of the ultrasound transducer; a is a n 、a n-1 、a n-2 、…、a 1 、a 0 The coefficient representing the fitting curve is obtained by calibration calculation when the ultrasonic transducer leaves a factory; n is a positive integer, T represents the temperature of the ultrasonic transducer;
the transducer matching circuit comprises a plurality of inductors, and the digital signal processor selects one inductor which meets the value range of the matched inductor from the plurality of inductors to be connected into the ultrasonic transducer so as to realize the inductor matching of the ultrasonic transducer; if the inductors do not meet the value range of the matching inductor, matching fails, which indicates that the temperature of the ultrasonic transducer is too high or the ultrasonic transducer is seriously aged, and the ultrasonic transducer needs to be replaced.
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, one inductor is connected in series to each selection channel of the chip selection chip, the control terminal of the chip selection chip is connected to the digital signal processor, and the output terminals of the chip selection chip are respectively connected to the output terminals of the ultrasonic transducer and the power amplification circuit.
3. The ultrasonic blade host computer of claim 1, wherein the transducer matching circuit comprises an adjustable inductor, the control end of the adjustable inductor is connected with the digital signal processor, and the output end of the adjustable inductor is connected with the output ends of the ultrasonic transducer and the power amplifying circuit, respectively.
4. The ultrasonic blade host machine according to claim 2 or 3, 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.
5. The ultrasonic blade host computer 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.
6. The ultrasonic blade host computer 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, and 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.
7. 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.
8. An ultrasonic scalpel system, comprising the ultrasonic scalpel host of any one of claims 1-7, further comprising the ultrasonic transducer, an ultrasonic scalpel head, and the temperature sensor, wherein an output terminal of the power amplifying circuit is connected to an output terminal of the transducer matching circuit and an input terminal of the ultrasonic transducer, respectively, an output terminal of the ultrasonic transducer is connected to the ultrasonic scalpel head, the temperature sensor is disposed in the ultrasonic transducer, and the temperature sensor is connected to the digital signal processor.
9. A method for automatically adjusting impedance of a transducer of an ultrasonic blade system, comprising the steps of:
providing the ultrasonic blade system of claim 8, the transducer matching circuit capable of providing a plurality of inductances that differ in inductive value;
the ultrasonic knife host is started, the transducer matching circuit is controlled to connect a first inductor into the ultrasonic transducer, and a first signal is output to the ultrasonic transducer;
when the ultrasonic transducer works, acquiring the real-time temperature of the ultrasonic transducer through the temperature sensor;
calculating the static capacitance of the ultrasonic transducer by utilizing a fitting curve formula of the static capacitance and the temperature according to the real-time temperature of the ultrasonic transducer;
calculating the value range of the matching inductance according to the static capacitance and the working frequency range of the ultrasonic scalpel system;
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.
10. The method of automatically adjusting the impedance of an ultrasonic blade system transducer of claim 9, further comprising 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911069992.2A CN112754605B (en) | 2019-11-05 | 2019-11-05 | Ultrasonic knife host, ultrasonic knife system and automatic adjustment method for impedance of transducer of ultrasonic knife system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911069992.2A CN112754605B (en) | 2019-11-05 | 2019-11-05 | Ultrasonic knife host, ultrasonic knife system and automatic adjustment method for impedance of transducer of ultrasonic knife system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112754605A CN112754605A (en) | 2021-05-07 |
| CN112754605B true CN112754605B (en) | 2022-12-27 |
Family
ID=75692629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911069992.2A Active CN112754605B (en) | 2019-11-05 | 2019-11-05 | Ultrasonic knife host, ultrasonic knife system and automatic adjustment method for impedance of transducer of ultrasonic knife system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112754605B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7476233B1 (en) * | 2000-10-20 | 2009-01-13 | Ethicon Endo-Surgery, Inc. | Ultrasonic surgical system within digital control |
| CN106021174A (en) * | 2016-07-08 | 2016-10-12 | 山东威瑞外科医用制品有限公司 | Device and method for tracking frequency of ultrasound knife |
| CN108168653A (en) * | 2017-12-13 | 2018-06-15 | 太原理工大学 | The ultrasonic level monitoring device of transducer impedance Adaptive matching |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004255017A (en) * | 2003-02-27 | 2004-09-16 | Matsushita Electric Ind Co Ltd | Ultrasonic probe and ultrasonic diagnostic apparatus |
| JP2012217012A (en) * | 2011-03-31 | 2012-11-08 | Nec Casio Mobile Communications Ltd | Electronic apparatus |
| EP3575826B1 (en) * | 2017-01-25 | 2021-08-11 | Murata Manufacturing Co., Ltd. | Ultrasonic device with capacitance measuring circuit |
-
2019
- 2019-11-05 CN CN201911069992.2A patent/CN112754605B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7476233B1 (en) * | 2000-10-20 | 2009-01-13 | Ethicon Endo-Surgery, Inc. | Ultrasonic surgical system within digital control |
| CN106021174A (en) * | 2016-07-08 | 2016-10-12 | 山东威瑞外科医用制品有限公司 | Device and method for tracking frequency of ultrasound knife |
| CN108168653A (en) * | 2017-12-13 | 2018-06-15 | 太原理工大学 | The ultrasonic level monitoring device of transducer impedance Adaptive matching |
Non-Patent Citations (1)
| Title |
|---|
| 基于数字电感的压电换能器动态匹配的研究;朱武、张佳民、金长善、蔡鹤皋;《应用声学》;20000330;第19卷(第2期);第31-34页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112754605A (en) | 2021-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112754604B (en) | Ultrasonic knife host, ultrasonic knife system and automatic matching method for impedance of transducer of ultrasonic knife system | |
| US5388569A (en) | Phacoemulsification probe circuit with switch drive | |
| US5590657A (en) | Phased array ultrasound system and method for cardiac ablation | |
| US7324357B2 (en) | Power supply apparatus for electric operation | |
| EP1633263B1 (en) | Electronic scalpel to cut organic tissues | |
| US5318563A (en) | Bipolar RF generator | |
| CN105943126B (en) | Ultrasound knife exciting bank and motivational techniques | |
| KR950700131A (en) | Ultrasonic Piezoelectric Crystal Transducer Control Systems for Monitoring Electrical and Electronic Control Loops and Their Combination Systems (ULTRASONIC SURGICAL APPARATUS) | |
| CN212515446U (en) | Ultrasonic transducer control device | |
| WO2015094748A1 (en) | Medical device | |
| CN107126639A (en) | High-frequency high-precision ultrasound physiotherapy generator | |
| JP4641134B2 (en) | Power support device for ultrasonic vibration dental handpiece | |
| WO2023174135A1 (en) | Control method and control device for ultrasonic transducer, surgical equipment, and storage medium | |
| CN112754605B (en) | Ultrasonic knife host, ultrasonic knife system and automatic adjustment method for impedance of transducer of ultrasonic knife system | |
| WO2024022268A1 (en) | Method for controlling dynamic branch current of ultrasonic transducer, and ultrasonic surgical system | |
| CN112731829A (en) | Dynamic matching network of medical ultrasonic power supply and matching method thereof | |
| US20070118102A1 (en) | Electrosurgical device | |
| JP4889832B2 (en) | Ultrasonic surgical system and surgical treatment instrument | |
| CN114917495B (en) | Multi-parameter adjustable signal source device for transcranial ultrasonic stimulation | |
| US20150236236A1 (en) | Ultrasound wave generating apparatus | |
| CN214805313U (en) | Radio frequency generating circuit, device and radio frequency host | |
| CN114515184A (en) | Ultrasonic knife system, power driving method and device thereof, and host | |
| CN219461318U (en) | Ultrasonic knife host computer and ultrasonic knife system | |
| CN113225031A (en) | Medical radio frequency output power adjusting method and system | |
| KR102642708B1 (en) | Change the focus point including impedance matching circuit of piezoelectric element High-intensity focused ultrasound |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |