CN113633350A - Circuit and method for real-time frequency adjustment of transducer and ultrasonic cutting hemostatic knife system - Google Patents
Circuit and method for real-time frequency adjustment of transducer and ultrasonic cutting hemostatic knife system Download PDFInfo
- Publication number
- CN113633350A CN113633350A CN202110060338.6A CN202110060338A CN113633350A CN 113633350 A CN113633350 A CN 113633350A CN 202110060338 A CN202110060338 A CN 202110060338A CN 113633350 A CN113633350 A CN 113633350A
- Authority
- CN
- China
- Prior art keywords
- phase difference
- frequency
- current
- voltage
- difference value
- 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.)
- Pending
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
Landscapes
- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Mechanical Engineering (AREA)
- Biomedical Technology (AREA)
- Dentistry (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
A circuit and a method for adjusting frequency of an energy transducer in real time comprise a driving circuit module for sending out sine wave signals to drive the ultrasonic transducer, a signal acquisition processing circuit module for converting the sine wave signals into voltage and current phase square wave signals, a phase conversion circuit module for converting the voltage and current phase square wave signals into phase difference square wave signals of voltage and current, and a controller. The controller adjusts the sine wave signal sent by the driving circuit module according to the voltage-current phase difference square wave signal until the phase of the voltage and the phase of the current of the sine wave signal are the same when the ultrasonic transducer works, so that the ultrasonic transducer works at the resonance frequency, the structure is simple, and the adjusting speed is high. An ultrasonic cutting hemostatic knife system with a frequency real-time adjusting circuit comprises an ultrasonic transducer and an ultrasonic knife, wherein the frequency adjusting circuit can be adaptive to ultrasonic characteristic change after the ultrasonic transducer and the ultrasonic knife are combined and can also be adaptive to load change during tissue cutting and hemostasis, and the effectiveness of ultrasonic surgery is improved.
Description
Technical Field
The invention belongs to the field of medical instruments, and relates to a frequency real-time adjusting circuit for a transducer;
also relates to a method for real-time frequency adjustment for the transducer;
in particular to an ultrasonic cutting hemostatic knife system with a frequency real-time adjusting circuit for a transducer.
Background
In the technical field of ultrasonic cutting hemostatic knives, the frequency output by an ultrasonic power supply is consistent with or close to the resonance frequency of an ultrasonic transducer, so that the ultrasonic transducer can have the highest working efficiency. In an actual operation process, the load of the ultrasonic transducer often changes along with the impedance of the resistance value of the living body cut by the ultrasonic knife in the operation process, so that the working frequency of the ultrasonic transducer is shifted. In order to always operate the ultrasonic transducer in the vicinity of the resonance frequency, the phases of the current and the voltage must be the same.
In the prior art, impedance is minimum when resonance occurs according to the ultrasonic transducer. When the input voltage is unchanged, the current passing through the ultrasonic transducer is the largest, the amplitude of the ultrasonic transducer is the largest at the moment, and frequency tracking can be carried out by detecting the magnitude of the current.
In the working engineering of the ultrasonic transducer, a plurality of current peak values are often generated, and then a circuit for distinguishing resonant frequency current is required to be added in the design, so that the design circuit is complex, the frequency of an ultrasonic signal output by an ultrasonic power supply cannot be kept consistent with the resonant frequency of the ultrasonic transducer quickly, and the adjustment speed is slow. When the resonant frequency of the ultrasonic transducer shifts, the electric signal of the ultrasonic transducer cannot be effectively converted into mechanical vibration, the ultrasonic blade cannot obtain enough energy, the vibration amplitude is small, and the cutting efficiency is low.
In addition, certain process errors exist in the manufacturing process of the ultrasonic transducer and the ultrasonic knife, so that the parameters of the ultrasonic transducer and the ultrasonic knife in the same batch are different. Therefore, in operation, the resonant frequency of the two will change, affecting the effectiveness and safety of tissue cutting or hemostasis.
Aiming at the defects in the prior art, a frequency adjusting circuit capable of adjusting the current phase and the voltage phase to be consistent needs to be designed to solve the problem that the resonant frequency is changed to reduce the effectiveness and safety of tissue cutting or hemostasis due to inconsistent parameters of an ultrasonic transducer and a scalpel during manufacturing or working.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a circuit and a method for adjusting the frequency of a transducer in real time and an ultrasonic cutting hemostatic knife system, which have simple structure and high adjusting speed, can enable a sine wave signal to be matched with the resonant frequency, are favorable for exciting the ultrasonic transducer to work stably with maximum efficiency, increase the ultrasonic energy output of an ultrasonic knife, and can carry out ultrasonic surgical cutting and hemostasis quickly and effectively.
The invention relates to a circuit for real-time frequency adjustment of a transducer, which comprises:
the driving circuit module is used for sending out a sine wave signal for driving the ultrasonic transducer;
the signal acquisition processing circuit module is used for converting the sine wave signal into a phase square wave signal of voltage and current;
the phase conversion circuit module is used for converting the phase square wave signals of the voltage and the current into voltage and current phase difference square wave signals;
the controller converts the acquired voltage-current phase difference square wave signals into phase difference values and compares and analyzes the phase difference values with prestored phase difference values to adjust sine wave signals sent by the driving circuit module, so that the voltage of the sine wave electric signals is the same as the phase of the current when the ultrasonic transducer works, and the ultrasonic transducer works at the resonance frequency.
Specifically, the signal acquisition processing circuit module includes:
the current signal acquisition module is used for acquiring a current signal of the ultrasonic transducer;
the voltage signal acquisition module is used for acquiring a voltage signal of the ultrasonic transducer;
the current signal processing module is connected with the current signal acquisition module and is used for processing the current signal data acquired by the current signal acquisition module;
and the voltage signal processing module is connected with the voltage signal acquisition module and is used for processing the voltage signal data acquired by the voltage signal acquisition module.
Specifically, the current signal processing module and the voltage signal processing module respectively include:
and each comparison unit comprises a comparison chip and is used for converting the sine wave signal into the square wave signal.
Specifically, the phase conversion circuit module includes:
the exclusive-OR gate inputs two levels, outputs a high level 1 when the two input levels are different, and outputs a low level 0 when the two input levels are the same;
and the current-limiting voltage-stabilizing unit is connected with the exclusive-OR gate and is used for current-limiting and stabilizing the level output by the exclusive-OR gate so as to enable the controller to receive and process the level.
Specifically, the current signal processing module and the voltage signal processing module further include:
the input end of the level conversion unit is connected with the output end of the comparison chip of the comparison unit, and the output end of the level conversion unit is connected with the phase conversion circuit module and used for outputting the level which can be received by the phase conversion circuit module;
the amplifying unit is connected with the input end of the comparing unit and is used for enhancing the driving capability of the transmission signal;
and the filtering unit is connected with the input end of the amplifying unit and is used for filtering the voltage signal or the current signal input to the amplifying unit.
The invention also provides a method for adjusting the frequency of the transducer in real time, which comprises the following steps:
s1, acquiring a voltage and current phase difference square wave signal;
s2, converting the acquired voltage and current phase difference square wave signal into a phase difference value, and comparing and analyzing the phase difference value with a prestored phase difference value to generate a frequency modulation control instruction;
and S3, outputting sine wave signals with the same phase of voltage and current according to the frequency modulation control instruction.
The invention provides a circuit and a method for adjusting frequency of an energy transducer in real time, which comprises a driving circuit module for sending out sine wave signals to drive an ultrasonic transducer, a signal acquisition and processing circuit module for converting the sine wave signals into phase square wave signals of voltage and current, a phase conversion circuit module for converting the phase square wave signals of the voltage and the current into phase difference square wave signals of the voltage and the current and a controller. The controller continuously adjusts the sine wave signal sent by the driving circuit module according to the voltage-current phase difference square wave signal until the phase of the voltage and the current of the sine wave signal is the same when the ultrasonic transducer works, so that the ultrasonic transducer works at the resonance frequency, and the ultrasonic transducer has the advantages of simple structure and high adjusting speed.
The invention also provides an ultrasonic cutting hemostatic knife system, comprising:
an ultrasonic transducer for converting electrical energy into mechanical energy;
the driving circuit module is used for generating a sine wave signal for driving the ultrasonic transducer;
an ultrasonic blade driven by the ultrasonic transducer to cut living tissue;
wherein, the drive circuit module includes:
a generator for outputting a sine wave signal;
the transformer is used for amplifying the sine wave signal output by the generator and driving the ultrasonic transducer;
the circuit for driving the transducer of the ultrasonic transducer to adjust frequency in real time is further included so as to adapt to load changes in tissue cutting and hemostasis.
The ultrasonic cutting hemostatic knife system with the frequency real-time adjusting circuit comprises the ultrasonic transducer and the ultrasonic knife, wherein the frequency adjusting circuit can be adaptive to the ultrasonic characteristic change after the ultrasonic transducer and the ultrasonic knife are combined and also adaptive to the load change during tissue cutting and hemostasis, the effectiveness of ultrasonic operation is improved, the system is always in a resonance state, the high requirement on the manufacturing consistency of the ultrasonic transducer and the ultrasonic knife is reduced, the cost is saved, and the safety during tissue cutting or hemostasis is guaranteed.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a circuit for real-time frequency adjustment of a transducer according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a current signal acquisition module and a voltage signal acquisition module in a circuit for real-time frequency adjustment of a transducer according to an embodiment of the present invention.
Fig. 3 is a flow chart of a method for real-time adjustment of a frequency for a transducer according to an embodiment of the present invention.
Fig. 4 is a flow chart of an averaging algorithm in the method of fig. 3 for real-time adjustment of the transducer with frequency.
Fig. 5 is a flow chart of a weighted average algorithm in the method of real-time adjustment of the transducer in fig. 3 with frequency.
FIG. 6 is a flow chart of a segmentation algorithm in the method of FIG. 3 for real-time adjustment of the transducer with frequency.
Fig. 7 is a block diagram of an ultrasonic cutting hemostatic knife system provided by an embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 and 7, a circuit for real-time adjustment of frequency for a transducer according to an embodiment of the present invention includes:
the driving circuit module 1 is used for sending out a sine wave signal for driving the ultrasonic transducer 2;
the signal acquisition processing circuit module 3 and the driving circuit module 1 are used for converting the sine wave signals into phase square wave signals of voltage and current;
the phase conversion circuit module 4 and the signal acquisition processing circuit module 3 are used for converting the phase square wave signals of the voltage and the current into voltage and current phase difference square wave signals;
the controller 5 converts the acquired voltage-current phase difference square wave signal into a phase difference value, compares the phase difference value with a prestored phase difference value, and analyzes the phase difference value to adjust the sine wave signal sent by the driving circuit module 1, so that the voltage of the sine wave electric signal is the same as the phase of the current when the ultrasonic transducer 2 works, and the ultrasonic transducer 2 works at the resonance frequency.
Specifically, the signal acquisition processing circuit module 3 includes:
a current signal collecting module 31 for collecting a current signal of the ultrasonic transducer 2;
a voltage signal acquisition module 32, configured to acquire a voltage signal of the ultrasound transducer 2;
the current signal processing module 33 is connected with the current signal acquisition module 31 and is used for processing current signal data acquired by the current signal acquisition module 31 and converting sine wave signals output by the driving circuit module 1 into square wave signals;
and the voltage signal processing module 34 is connected to the voltage signal acquisition module 32, and is configured to process the voltage signal data acquired by the voltage signal acquisition module 32 and convert the sine wave signal output by the driving circuit module 1 into a square wave signal.
Specifically, the current signal processing module 33 and the voltage signal processing module 34 respectively include:
the comparing units 331, each of the comparing units 331 includes a comparing chip U1, and the comparing chip U1 is used for converting a sine wave signal into a square wave signal.
Specifically, the comparing unit 331 further includes a first resistor R1, a first capacitor C1, a second resistor R2, and a second capacitor C2;
wherein each of the comparison chips U1 includes:
the Output2 end is used for connecting with the positive pole of the 12V power supply through a first resistor R1, the first resistor R1 is a pull-up resistor, an uncertain signal is clamped at a high level through a resistor, and the first resistor R1 plays a role in current limiting at the same time.
The VCC end is respectively connected with the positive electrode of the 12V power supply and one end of a first capacitor C1, the other end of the first capacitor C1 is grounded, and the first capacitor C1 plays a role in filtering;
-Input2 terminal, connected to ground through a second resistor R2;
the + Input2 end is used for inputting current signals or voltage signals;
and the GND end is respectively connected with the negative electrode of the 12V power supply and one end of a second capacitor C2, the other end of the second capacitor C2 is grounded, and the second capacitor C2 plays a role in filtering.
Specifically, the phase conversion circuit block 4 includes:
the exclusive-or gate U2 inputs two levels, outputs a high level 1 when the two input levels are different, and outputs a low level 0 when the two input levels are the same;
and the current-limiting voltage-stabilizing unit is connected with the exclusive-or gate U2 and is used for current-limiting and voltage-stabilizing the level output by the exclusive-or gate so as to enable the controller 5 to receive and process the level.
Specifically, the current-limiting voltage stabilizing unit comprises a seventh resistor R7, an eighth resistor R8 and a second diode D2, and the circuit structure can enable the exclusive-OR gate U2 to output a stable signal which can be received by a controller;
wherein, exclusive-or gate U2 includes:
the first input ends are respectively connected with the output end of a comparison chip U1 for processing the current signals;
the second input ends are respectively connected with the output end of the comparison chip U1 for processing the voltage signals;
the positive terminal is used for being connected with the positive electrode of a 5V power supply;
the negative electrode end is used for grounding;
an output terminal connected to one end of the seventh resistor R7;
the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, one end of the second diode D2 and the controller 5, respectively, and the other end of the eighth resistor R8 and the other end of the second diode D2 are grounded, respectively.
Specifically, the current signal processing module 33 and the voltage signal processing module 34 further include:
an input end of the level conversion unit 330 is connected to an output end of the comparison chip U1 of the comparison unit 331, and an output end of the level conversion unit 330 is connected to the phase conversion circuit module 4, and is configured to output a level that can be received by the phase conversion circuit module 4;
the amplifying unit 332, the amplifying unit 332 is connected to the input end of the comparing unit 331, and is used for enhancing the driving capability of the transmission signal;
and a filtering unit 333 connected to an input terminal of the amplifying unit 332, for filtering the voltage signal or the current signal input to the amplifying unit 332.
Specifically, the level conversion unit 330 includes: a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11, each of which functions as a voltage divider for enabling the level shifter unit 330 to output a level receivable by the xor gate U2;
one end of a ninth resistor R9 is connected with the Output2 end, the other end of the ninth resistor R9 is connected with a tenth resistor R10 and an eleventh resistor R11 respectively, the other end of the tenth resistor R10 is grounded, and the other end of an eleventh resistor R11 in the comparison unit 330 is connected with the first input end of the exclusive-or gate U2;
the other end of the eleventh resistor R11 of the comparing unit 330 in the voltage signal processing module 34 is connected to the second input end of the xor gate U2.
Specifically, the amplifying unit 332 includes: the voltage signal amplifying circuit comprises a first follower U3, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15, wherein the thirteenth resistor R13 and the fourteenth resistor R14 are provided with amplification factors for enabling the first follower U3 to amplify the voltage signal by the times in proportion;
the first follower U3 includes:
the first in-phase input end is grounded through a twelfth resistor R12, and the twelfth resistor R12 is a balance resistor, so that the influence of input bias current on output is reduced;
a first inverting input terminal connected to one end of the thirteenth resistor R13 and one end of the fourteenth resistor R14, respectively, to set an amplification factor;
the first output end is respectively connected with the other end of the fourteenth resistor R14 and one end of the fifteenth resistor R15, and the other end of the fifteenth resistor R15 is connected with the end of + Input 2;
the positive electrode end is connected with the positive electrode of the 12V power supply;
and the negative electrode end is connected with the negative electrode of the 12V power supply.
Specifically, the filtering unit 333 is composed of a second follower U4 and a multiple-order filter; in this embodiment, the number of the multi-order filters is two, and the multi-order filters include a first-order filter and a second-order filter, wherein the fourth capacitor C4 and the sixteenth resistor R16 form the first-order filter, the seventeenth resistor R17 and the fifth capacitor C5 form the second-order filter, and the first-order filter and the second-order filter are used for setting filter parameters of the second follower U4, so that the filtering effect is good;
the second follower U4 includes:
the second non-inverting input end is connected with one end of a fourth capacitor C4 and one end of a sixteenth resistor R16 respectively, the other end of the fourth capacitor C4 is grounded, the other end of the sixteenth resistor R16 is connected with one end of a seventeenth resistor R17 and one end of a fifth capacitor C5 respectively, and the other end of a seventeenth resistor R17 in the filtering unit 333 is connected with the current signal acquisition module 31;
the other end of a seventeenth resistor R17 in the filtering unit 333 is connected to the voltage signal acquisition module 32;
a second inverting input terminal connected to the other end of the fifth capacitor C5;
and the second output end is respectively connected with the second inverting input end and the other end of the thirteenth resistor R13.
In this embodiment, the current signal processing module 33 and the voltage signal processing module 34 respectively include a level converting unit 330, a comparing unit 331, an amplifying unit 332, and a filtering unit 333, which can be mass-produced and reduce the processing cost.
As shown in fig. 2, specifically, the voltage signal acquisition module 31 and the current signal acquisition module 32 respectively include a sampling unit 311, a first amplifying unit 312, an isolating unit 313, a filtering unit 314, and a second amplifying unit 315, which can provide real-time and accurate voltage and current signals for the current signal processing module 33 and the voltage signal processing module 34, so as to process a phase difference between the voltage signal and the current signal, and provide a basis for resonance adjustment and power adjustment of the ultrasonic transducer 2.
In this embodiment, the transformer drives the ultrasonic transducer 2 via a signal acquisition circuit.
Preferably, in this embodiment, the two sampling units 311 have different structures, and the two first amplifying units 312, the two isolating units 313, the two filtering units 314, and the two second amplifying units 315 have the same structure and similar principles.
Specifically, one of the sampling units 311 is composed of a series resistor (the series resistor is a plurality of resistors arranged in series) for stepping down the high voltage output to the anode of the ultrasonic transducer;
the other sampling unit 311 is composed of a series resistor (the series resistor is a plurality of resistors arranged in series) and is used for converting a loop current signal in the ultrasonic transducer into a voltage signal for collection.
A first amplification unit 312 for amplifying the signal in scale;
the isolation unit 313 is a transformer, and is connected to the first voltage amplification unit 112, where the transformer is used to isolate and convert the voltage signal and the current signal output by the first amplification unit 312, and then transmit the voltage signal and the current signal to a post-stage filtering unit;
the filtering unit 314 is connected with the mutual inductor and is used for filtering noise waves in a voltage signal or a current signal output by the mutual inductor;
and a second amplifying unit 315 connected to the filtering unit 314, wherein the second amplifying unit 315 is configured to amplify the input voltage or current proportionally, so as to avoid loss of the voltage signal or the current signal during transmission.
Specifically, one of the sampling units 311 includes:
a plurality of eighteenth resistors R18 arranged in series and a plurality of nineteenth resistors R19 arranged in series, wherein the eighteenth resistor R18 and the nineteenth resistor R19 are arranged in parallel, one end of the first eighteenth resistor R18 and one end of the first nineteenth resistor R19 are respectively connected with one end of the transformer secondary and the anode of the ultrasonic transducer, and the other end of the last eighteenth resistor R18 and the other end of the last nineteenth resistor R19 are respectively grounded.
A plurality of eighteenth resistors R18 and nineteenth resistors R19 are provided to function as shunts.
Preferably, the number of the eighteenth resistor R18 and the nineteenth resistor R19 is three, and two ends of the second eighteenth resistor R18 and the second nineteenth resistor R19 are respectively connected in parallel.
Specifically, another sampling unit 311 includes:
and a plurality of twenty-second resistors R20 arranged in series, preferably two twentieth resistors R20 in this embodiment, wherein one end of the first twentieth resistor R20 is connected to the other end of the transformer secondary, the other end of the last twentieth resistor R20 is connected to the eighteenth resistor R18, the nineteenth resistor R19 and the negative electrode terminal of the ultrasonic transducer, and the other end of the twentieth resistor R20 is further connected to ground.
Specifically, the first amplification unit 312 includes:
the amplifier comprises a first amplifier U5, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26 and a twenty-seventh resistor R27, wherein the twenty-first resistor R21 and the twenty-second resistor R22 are connected in series to set amplification times, and the twenty-third resistor R23, the twenty-fourth resistor R24, the twenty-fifth resistor R25, the twenty-sixth resistor R26 and the twenty-seventh resistor R27 play a role in voltage division;
the first amplifier comprises a Vout-end, a Vout + end, a VIN-end, a VCC + end, a PD end and a Vocm end;
the Vout-end is respectively connected with one end of the twenty-first resistor R21 and one end of a twenty-third resistor R23, and the other end of the twenty-third resistor R23 is connected with one end of the primary of the transformer 113;
the terminal Vout + is respectively connected with one end of a twenty-fourth resistor R24 and one end of a twenty-fifth resistor R25, the other end of the twenty-fourth resistor R24 is respectively connected with the VIN-terminal and one end of a twenty-sixth resistor R26, the other end of the twenty-sixth resistor R26 is connected with the Vocm terminal and grounded, and the twenty-fifth resistor R25 is connected with the other end of the primary of the transformer 113;
the VCC-end is used for being connected with the negative end of a 5V power supply;
the VCC + end is used for being connected with the positive end of a 5V power supply;
the PD end is connected with a positive end used for being connected with a 5V power supply through the twenty-seventh resistor R27;
the VIN + terminal is connected to a node between the twenty-first resistor R21 and the twenty-second resistor R22.
Specifically, the twenty-second resistor R22 in one of the first amplifying units 312 is connected to the eighteenth resistor R18 and the nineteenth resistor R19, respectively, and the twenty-second resistor R22 in the other of the first amplifying units 312 is connected to a node between a transformer and the twentieth resistor R20.
Specifically, the filtering unit 314 includes:
a twenty-eighth resistor R28, one end of which is connected to the other end of the primary of the transformer 113;
a twenty-ninth resistor R29 connected in parallel with the twenty-eighth resistor R28, wherein one end of the twenty-ninth resistor R29 is connected with the other end of the secondary of the transformer 113;
and the sixth capacitor C6 is connected to the other ends of the twenty-eighth resistor R28 and the twenty-ninth resistor R29.
Specifically, the second amplifying unit 315 includes a second amplifier U6, a thirtieth resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, and a bidirectional diode D2;
the second amplifier U6 comprises two RG ends, an IN end, a VS + end, an IN + end, an OUT end, a VS-end and a REF end;
a thirtieth resistor R30 is connected between the two RG ends, the IN-end is respectively connected with the other end of the twenty-eighth resistor R28, one end of the thirty-first resistor R31 and one end of the thirty-second resistor R32, and the other end of the thirty-first resistor R31 is grounded;
the IN + end is respectively connected with the other end of the thirty-second resistor R32, one end of the thirty-third resistor R33 and one end of the bidirectional diode D2, the other end of the thirty-third resistor R33 is connected with the other end of the twenty-ninth resistor R29, and the other end of the bidirectional diode D2 is grounded;
the VS + end is connected with the positive end of the 12V power supply;
the VS-end is connected with the negative end of the 12V power supply;
the REF terminal is connected to ground.
The OUT terminal of the second amplifying unit 315 in the current signal collecting module 31 is used for being connected with the current signal processing circuit module 33;
the OUT terminal of the second amplifying unit 315 in the voltage signal collecting module 32 is used for connecting with the voltage signal processing circuit module 34.
In this embodiment, the first amplifying unit 312, the isolating unit 313, the filtering unit 314 and the second amplifying unit 315 in the voltage signal collecting module 31 and the current signal collecting module 32 are the same, so that batch production can be performed, and the processing cost can be reduced.
The voltage signal acquisition module 31 and the current signal acquisition module 32 respectively include a sampling unit 311 for acquiring a voltage signal and a current signal of the ultrasonic transducer 2, a first amplification unit 312 connected to the sampling unit 311, an isolation unit 313 for isolating the high voltage signal or the high current signal output by the first amplification unit 312, a filtering unit 314 for filtering noise in the isolated voltage signal or current signal, and a second amplification unit 315 for amplifying the filtered voltage signal or current signal in proportion, so as to provide a voltage signal and a current signal which can be received and are stable; so that the controller 5 at the later stage detects whether the voltage signal and the current signal are in phase to provide a basis for resonance adjustment, thereby enabling the ultrasonic transducer to be in a normal resonance state.
As shown in fig. 3 to 6, the present invention further provides a method for real-time adjustment of frequency for a transducer, comprising the steps of:
s1, acquiring a voltage and current phase difference square wave signal;
s2, converting the acquired voltage and current phase difference square wave signal into a phase difference value, and comparing and analyzing the phase difference value with a prestored phase difference value to generate a frequency modulation control instruction;
and S3, outputting sine wave signals with the same phase of voltage and current according to the frequency modulation control instruction.
Step S1 specifically includes:
the controller controls a generator in the driving circuit module to output sine wave signals at a preset initial frequency, continuously captures low-level pulse widths input by the phase conversion circuit module, and obtains an average value of the continuous low-level pulse widths through an average value algorithm to obtain a current phase difference value.
Step S2 specifically includes:
a. judging whether the current phase difference value is within a preset frequency sweep range, wherein the preset frequency sweep range is less than 360, the 360 is converted from a formula y which is 9X, y is the frequency sweep range, X is the phase difference, the definition domain is 0-90 degrees, and when the X is 40 degrees, the frequency sweep range is 360 degrees;
b. when the phase difference value is not in the preset range, judging whether the frequency with the minimum phase difference value exists or not, wherein the frequency is close to the resonance frequency of the ultrasonic transducer and the ultrasonic knife, and if not, driving the generator to increase the output frequency by the controller;
c. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the continuous low-level pulse width through an average value algorithm to obtain the current phase difference value, and returns to the step a to start again;
d. when the phase difference value is within a preset range, the controller detects whether the current phase difference value is smaller than the minimum phase difference value;
e. when the current phase difference value detected by the controller is larger than the minimum phase difference value, the controller drives the generator to increase the output frequency;
f. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the continuous low-level pulse width through an average value algorithm to obtain the current phase difference value, and returns to the step a to start again;
g. when the current phase difference value detected by the controller is smaller than the minimum phase difference value, the controller stores the current frequency value and the phase difference value; meanwhile, the controller drives the generator to increase the output frequency;
h. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the continuous low-level pulse width through an average value algorithm to obtain the current phase difference value, and returns to the step a to start again;
i. when the phase difference value is not in the preset range, judging whether the frequency with the minimum phase difference value exists, if so, the frequency is the resonant frequency of the ultrasonic transducer and the ultrasonic knife;
j. when the frequency of the minimum phase difference value is obtained, the controller drives the generator to output a sine wave signal at the frequency;
k. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the low-level pulse widths for multiple times through an average value algorithm so as to obtain the phase difference value between the current and the voltage.
Step S3 specifically includes:
the controller obtains the average value of the two phase difference values through a weighted average algorithm according to the phase difference value detected currently and the phase difference value of the last frequency modulation, and obtains a frequency adjustment value through a segmentation algorithm so as to drive the generator to output sine wave signals enabling the ultrasonic transducer and the ultrasonic knife to work in a resonance state.
Specifically, the averaging algorithm includes the steps of:
a. by the formula
Acquiring the average value of the low-level pulse widths of the phase conversion circuit modules 4 captured at two adjacent sides;
b. taking the data of the previous step for n times: x1、X2、X3、X4、X5、X6……Xn；
c. Removing the maximum value and the minimum value in the n-time data;
d. according to the formula of the mean value
The phase difference between the present current and voltage is obtained.
Specifically, the weighted average algorithm includes the steps of:
a. according to the weighted average formula:
wherein W is the weight of each number, and X is the phase difference of each number;
b. a weighted average of the phase difference values is obtained.
Specifically, the segmentation algorithm comprises the following steps:
a. using a corresponding f (x) function according to a domain in which a weighted average of the phase differences of the current phase and the voltage phase is located;
b. according to the formula:
f(x)＝f1+k1x, wherein x < 50;
f(x)＝f1+k2x, wherein 50 < x < 150;
f(x)＝f1+k3x, wherein 150 < x < 300;
f(x)＝f1+k4x, wherein 300 < x < 500;
obtaining a frequency adjustment value f, wherein f1Is the last adjusted frequency value, k1、k2、k3、k4Is the scaling factor of each piecewise function.
The invention provides a circuit and a method for adjusting frequency of an energy transducer in real time, which comprises a driving circuit module 1 for sending out sine wave signals to drive an ultrasonic transducer, a signal acquisition and processing circuit module 3 for converting the sine wave signals into phase square wave signals of voltage and current, a phase conversion circuit module 4 for converting the phase square wave signals of the voltage and the current into phase difference square wave signals of the voltage and the current, and a controller 5. The controller 5 continuously adjusts the sine wave signal sent by the driving circuit module 1 according to the voltage-current phase difference square wave signal until the phase of the voltage and the current of the sine wave signal is the same when the ultrasonic transducer 2 works, so that the ultrasonic transducer 2 works at the resonance frequency, and the ultrasonic transducer has the advantages of simple structure and high adjusting speed.
As shown in fig. 7, the present invention also provides an ultrasonic cutting hemostatic knife system comprising:
an ultrasonic transducer 2 for converting electrical energy into mechanical energy;
a driving circuit module for generating a sine wave signal for driving the ultrasonic transducer 2;
an ultrasonic blade 6 driven by the ultrasonic transducer 2 to cut the living tissue;
wherein the driving circuit module includes:
a generator 21 for outputting a sine wave signal;
the transformer 22 is used for amplifying the sine wave signal output by the generator 21 and driving the ultrasonic transducer 2, and further comprises a circuit for driving the transducer of the ultrasonic transducer 2 to adjust the frequency in real time as described above, and the transducer drives the ultrasonic transducer 2 by the circuit for adjusting the frequency in real time, so that the ultrasonic transducer 2 adapts to the load change during tissue cutting and hemostasis.
In this embodiment, the voltage phase is close to or equal to the current phase, and the amplitude of the ultrasonic blade 6 driven by the ultrasonic transducer 2 is the largest, and the cutting efficiency is the highest.
The invention also provides an ultrasonic cutting hemostatic knife system with a frequency real-time adjusting circuit, which comprises the ultrasonic transducer 2 and the ultrasonic knife 6, wherein the frequency real-time adjusting circuit for the transducer can adapt to the ultrasonic characteristic change after the ultrasonic transducer 2 and the ultrasonic knife 6 are combined and also can adapt to the load change during tissue cutting and hemostasis, so that the effectiveness of ultrasonic operation is improved, the ultrasonic system always works in a resonance state, the high requirement on the manufacturing consistency of the ultrasonic transducer 2 and the ultrasonic knife 6 is reduced, the cost is saved, and the safety during tissue cutting or hemostasis is ensured.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A circuit for real-time adjustment of frequency for a transducer, comprising:
the driving circuit module is used for sending out a sine wave signal for driving the ultrasonic transducer;
the signal acquisition processing circuit module is used for converting the sine wave signal into a phase square wave signal of voltage and current;
the phase conversion circuit module is used for converting the phase square wave signals of the voltage and the current into voltage and current phase difference square wave signals;
the controller converts the acquired voltage-current phase difference square wave signals into phase difference values and compares and analyzes the phase difference values with prestored phase difference values to adjust sine wave signals sent by the driving circuit module, so that the voltage of the sine wave electric signals is the same as the phase of the current when the ultrasonic transducer works, and the ultrasonic transducer works at the resonance frequency.
2. The circuit for real-time adjustment of frequency for a transducer according to claim 1, wherein the signal acquisition processing circuit module comprises:
the current signal acquisition module is used for acquiring a current signal of the ultrasonic transducer;
the voltage signal acquisition module is used for acquiring a voltage signal of the ultrasonic transducer;
the current signal processing module is used for processing the current signal data acquired by the current signal acquisition module and converting the sine wave signal output by the driving circuit module into a square wave signal;
and the voltage signal processing module is used for processing the voltage signal data acquired by the voltage signal acquisition module and converting the sine wave signal output by the driving circuit module into a square wave signal.
3. The circuit for real-time adjustment of frequency for a transducer according to claim 2,
the current signal processing module and the voltage signal processing module respectively include:
each comparison unit comprises a comparison chip, and the comparison chips are used for converting sine wave signals into square wave signals.
4. The circuit for real-time adjustment of frequency for a transducer according to claim 3, wherein the phase conversion circuit module comprises:
the exclusive-OR gate can input two levels, when the two input levels are different, a high level 1 is output, and when the two input levels are the same, a low level 0 is output;
and the current-limiting voltage stabilizing unit is connected with the exclusive-OR gate and is used for current-limiting and stabilizing the level output by the exclusive-OR gate U2 so as to enable the controller to receive and process the level.
5. The circuit for real-time adjustment of frequency for a transducer according to claim 4, wherein the current signal processing module and the voltage signal processing module further comprise:
the input end of the level conversion unit is connected with the output end of the comparison chip of the comparison unit, and the output end of the level conversion unit is connected with the phase conversion circuit module and used for outputting the level which can be received by the phase conversion circuit module;
the amplifying unit is connected with the input end of the comparing unit and is used for enhancing the driving capability of the transmission signal;
and the filtering unit is connected with the input end of the amplifying unit and is used for filtering the voltage signal or the current signal input to the amplifying unit.
6. A method for real-time adjustment of frequency for a transducer, comprising the steps of:
s1, acquiring a voltage and current phase difference square wave signal;
s2, converting the acquired voltage and current phase difference square wave signal into a phase difference value, and comparing and analyzing the phase difference value with a prestored phase difference value to generate a frequency modulation control instruction;
and S3, outputting sine wave signals with the same phase of voltage and current according to the frequency modulation control instruction.
7. The method according to claim 6, wherein step S1 specifically includes:
the controller controls a generator in the driving circuit module to output sine wave signals at a preset initial frequency, continuously captures low-level pulse widths input by the phase conversion circuit module, and obtains an average value of the continuous low-level pulse widths through an average value algorithm to obtain a current phase difference value.
8. The method according to claim 7, wherein step S2 specifically includes:
a. judging whether the current phase difference value is within a preset frequency sweep range, wherein the preset frequency sweep range is less than 360, the 360 is converted from a formula y which is 9X, y is the frequency sweep range, X is the phase difference, the definition domain is 0-90 degrees, and when the X is 40 degrees, the frequency sweep range is 360 degrees;
b. when the phase difference value is not in the preset range, judging whether the frequency with the minimum phase difference value exists or not, wherein the frequency is close to the resonance frequency of the ultrasonic transducer and the ultrasonic knife, and if not, driving the generator to increase the output frequency by the controller;
c. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the continuous low-level pulse width through an average value algorithm to obtain the current phase difference value, and returns to the step a to start again;
d. when the phase difference value is within a preset range, the controller detects whether the current phase difference value is smaller than the minimum phase difference value;
e. when the current phase difference value detected by the controller is larger than the minimum phase difference value, the controller drives the generator to increase the output frequency;
f. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the continuous low-level pulse width through an average value algorithm to obtain the current phase difference value, and returns to the step a to start again;
g. when the current phase difference value detected by the controller is smaller than the minimum phase difference value, the controller stores the current frequency value and the phase difference value; meanwhile, the controller drives the generator to increase the output frequency;
h. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the continuous low-level pulse width through an average value algorithm to obtain the current phase difference value, and returns to the step a to start again;
i. when the phase difference value is not in the preset range, judging whether the frequency with the minimum phase difference value exists, if so, the frequency is the resonant frequency of the ultrasonic transducer and the ultrasonic knife;
j. when the frequency of the minimum phase difference value is obtained, the controller drives the generator to output a sine wave signal at the frequency;
k. the controller continuously captures the low-level pulse width input by the phase conversion circuit module, and obtains the average value of the low-level pulse widths for multiple times through an average value algorithm so as to obtain the phase difference value between the current and the voltage.
9. The method according to claim 8, wherein step S3 specifically includes:
the controller obtains the average value of the two phase difference values through a weighted average algorithm according to the phase difference value detected currently and the phase difference value of the last frequency modulation, and obtains a frequency adjustment value through a segmentation algorithm so as to drive the generator to output sine wave signals enabling the ultrasonic transducer and the ultrasonic knife to work in a resonance state.
10. An ultrasonic cutting hemostasis blade system comprising:
an ultrasonic transducer for converting electrical energy into mechanical energy;
an ultrasonic blade driven by the ultrasonic transducer to cut living tissue;
wherein the driving circuit module includes:
a generator for outputting a sine wave signal;
the transformer is used for amplifying the sine wave signal output by the generator and driving the ultrasonic transducer;
the ultrasonic surgical instrument is characterized by further comprising a circuit for driving the transducer of the ultrasonic transducer to adjust in real time with frequency according to any one of claims 1 to 5 so as to adapt to load changes in tissue cutting and hemostasis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110060338.6A CN113633350A (en) | 2021-01-18 | 2021-01-18 | Circuit and method for real-time frequency adjustment of transducer and ultrasonic cutting hemostatic knife system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110060338.6A CN113633350A (en) | 2021-01-18 | 2021-01-18 | Circuit and method for real-time frequency adjustment of transducer and ultrasonic cutting hemostatic knife system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113633350A true CN113633350A (en) | 2021-11-12 |
Family
ID=78415678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110060338.6A Pending CN113633350A (en) | 2021-01-18 | 2021-01-18 | Circuit and method for real-time frequency adjustment of transducer and ultrasonic cutting hemostatic knife system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113633350A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305600A (en) * | 2022-03-15 | 2022-04-12 | 厚凯(北京)医疗科技有限公司 | Control method and device of ultrasonic surgical instrument, surgical equipment and storage medium |
| CN116687518A (en) * | 2022-10-28 | 2023-09-05 | 江西远赛医疗科技有限公司 | Resonant frequency tracking method and device, electronic equipment and storage medium |
-
2021
- 2021-01-18 CN CN202110060338.6A patent/CN113633350A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305600A (en) * | 2022-03-15 | 2022-04-12 | 厚凯(北京)医疗科技有限公司 | Control method and device of ultrasonic surgical instrument, surgical equipment and storage medium |
| CN114305600B (en) * | 2022-03-15 | 2022-06-03 | 厚凯(北京)医疗科技有限公司 | Control method and device of ultrasonic surgical instrument, surgical equipment and storage medium |
| WO2023174136A1 (en) * | 2022-03-15 | 2023-09-21 | 厚凯(北京)医疗科技有限公司 | Control method and apparatus for ultrasonic surgical instrument, surgical device, and storage medium |
| CN116687518A (en) * | 2022-10-28 | 2023-09-05 | 江西远赛医疗科技有限公司 | Resonant frequency tracking method and device, electronic equipment and storage medium |
| CN116687518B (en) * | 2022-10-28 | 2024-05-28 | 江西远赛医疗科技有限公司 | Resonant frequency tracking method and device, electronic equipment and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113633350A (en) | Circuit and method for real-time frequency adjustment of transducer and ultrasonic cutting hemostatic knife system | |
| CN103997206B (en) | Switching power source | |
| CN103296568B (en) | Pulse fiber laser acoustic optical modulator driving power source | |
| CN113648028A (en) | Ultrasonic cutting hemostatic knife system | |
| CN112350599B (en) | Method and device for quickly tracking ultrasonic resonance frequency | |
| CN210990592U (en) | Ultrasonic knife host and ultrasonic knife system | |
| CN215534824U (en) | Circuit for real-time frequency adjustment of transducer and ultrasonic cutting hemostatic knife system | |
| CN113633351A (en) | Constant-current type power self-adaptive drive control circuit and method and ultrasonic cutting hemostatic knife system | |
| CN203722530U (en) | Variable frequency air conditioner, air condition compressor controller and current sampling circuit thereof | |
| CN113691225B (en) | Power amplifier with on-line impedance monitoring function and adjusting method thereof | |
| CN117653283A (en) | Frequency locking method for ultrasonic surgical instrument transducer | |
| CN112532198B (en) | Radio frequency ion source impedance matching method and device | |
| CN111371418A (en) | Control circuit for environmental noise detector and sound-electricity conversion suppression method | |
| CN111375538B (en) | Frequency control circuit and ultrasonic transducer system | |
| US11728741B2 (en) | Method of operating a power generation system | |
| CN115153761B (en) | Ultrasonic cutting hemostatic cutter control system and frequency sweeping and automatic tracking control method thereof | |
| US8653683B2 (en) | Device for controlling a double-fed asynchronous machine | |
| CN113014115B (en) | Ultrasonic power supply and power supply method thereof | |
| CN215584298U (en) | Constant-current power self-adaptive drive control circuit and ultrasonic cutting hemostatic knife system | |
| CN211043510U (en) | Impedance measuring device for grid-connected inverter | |
| CN106344119A (en) | Direct excitation type ultrasonic power driving system | |
| CN114062758A (en) | Electric signal detection method, circuit and switching power supply | |
| CN108427475B (en) | Extremely simple form SPWM digital generation system and method based on pulse sampling | |
| CN107948116B (en) | Power amplifying device based on polar modulation | |
| CN114515184A (en) | Ultrasonic knife system, power driving method and device thereof, and host |
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 |