CN115252059A - Ultrasonic surgical operation system - Google Patents
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- 230000005284 excitation Effects 0.000 claims abstract description 47
- 230000033228 biological regulation Effects 0.000 claims abstract description 15
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- 238000011105 stabilization Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 36
- 238000004891 communication Methods 0.000 claims description 33
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
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- 238000005520 cutting process Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
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- 230000023555 blood coagulation Effects 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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- 230000003993 interaction Effects 0.000 description 1
- 238000002324 minimally invasive surgery Methods 0.000 description 1
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- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00017—Electrical control of surgical instruments
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- 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
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Abstract
The invention discloses an ultrasonic surgical operation system which comprises a display screen, an FPGA control module, an excitation control module, an ultrasonic energy generation module, an energy output module, a handle, a frequency regulation phase-locked loop module, a protection adjustment module and a power locking module. The frequency adjustment phase-locked loop module of the ultrasonic surgical system can feed back and adjust the output frequency in real time according to the load change in the cutting process, so that the system is always in the optimal resonance state, the ultrasonic energy is stabilized, and the power locking module can realize the power stabilization of the ultrasonic energy according to the sampling and signal conditioning of current and voltage.
Description
Technical Field
The invention belongs to the technical field of surgical operation equipment, and particularly relates to an ultrasonic surgical operation system.
Background
The ultrasonic technology of electrosurgery has been widely applied in the medical field, in particular, the ultrasonic knife plays an increasingly important role in minimally invasive surgery, the cutting operation using the ultrasonic knife has the advantages of blood coagulation and hemostasis while cutting, the temperature of the knife head is controlled to be low, generally not more than 100 ℃, and the heat damage to surrounding tissues is very small. An ultrasonic scalpel system generally comprises a main machine, a handle, a scalpel head and a switch, wherein the main machine is used for generating ultrasonic electric energy signals required by the handle, the handle is used for converting the ultrasonic electric energy into mechanical energy of longitudinal vibration, the scalpel head is used for transmitting the mechanical vibration from the handle to the scalpel head through amplitude variation amplification, and finally the vibration energy is transmitted to tissues at the tail end of the scalpel head to generate blood coagulation and cutting effects.
The electric energy signal sent by the ultrasonic knife main machine firstly has high enough energy to drive the handle and the knife head to work, and then the signal frequency has to be consistent with the resonance frequency of the handle knife head to obtain the maximum amplitude of the tail end of the knife head so as to generate the best cutting efficiency. Because the resonant frequency of the handle and the cutter head is greatly related to the characteristics of the handle and the cutter head and also greatly related to the load generated by the tissue clamped at the tail end at every moment, the load is also changed at any time along with the cutting process, and therefore the output frequency of the system can be continuously adjusted according to the actual load by the host machine, so that the system is always in the optimal resonant state.
Therefore, it is an urgent need to provide an ultrasonic mainframe capable of constantly adjusting a system to be in an optimal resonance state according to a load change of an ultrasonic cutter head, that is, maintaining the maximum efficiency of output energy.
Disclosure of Invention
The present invention is directed to solving the above problems and providing an ultrasonic surgical system.
The technical scheme of the invention is as follows: an ultrasonic surgical system comprises a display screen, an FPGA control module, an excitation control module, an ultrasonic energy generation module, an energy output module, a handle, a frequency regulation phase-locked loop module, a protection adjustment module and a power locking module;
the FPGA control module is respectively in communication connection with the display screen, the excitation control module, the ultrasonic energy generation module, the frequency regulation phase-locked loop module and the protection adjustment module; the ultrasonic energy generation module and the handle are in communication connection with the protection adjustment module; the ultrasonic energy generation module, the energy output module and the handle are sequentially in communication connection; the frequency adjusting phase-locked loop module is respectively in communication connection with the ultrasonic energy generating module and the handle; the power locking module is in communication with the handle and the ultrasonic energy generation module respectively.
Furthermore, the FPGA control module is used for carrying out state detection on the excitation control module, the ultrasonic energy generation module, the energy output module, the handle, the frequency regulation phase-locked loop module, the protection adjustment module and the power locking module, and the specific method comprises the following steps: when the ultrasonic surgical system works, the parameter information of the ultrasonic surgical system is set by using the display screen, the parameter information is received and stored by using the FPGA control module, an excitation command is sent to the ultrasonic energy generation module by using the excitation control module, the excitation command is output to the handle by using the ultrasonic energy output module, and the ultrasonic energy frequency is output by using the frequency adjusting phase-locked loop module; the power locking module is used for outputting ultrasonic energy power, and the FPGA control module is used for detecting whether an excitation command is changed, whether parameter information is changed and whether an ultrasonic surgical system is abnormal.
Further, the excitation control module comprises a handle excitation circuit and a pedal excitation circuit;
the handle excitation circuit is used for conditioning an excitation control signal of the handle and transmitting the signal to the FPGA control module; the pedal excitation circuit is used for conditioning pedal excitation control signals and transmitting the pedal excitation control signals to the FPGA control module.
Furthermore, the ultrasonic energy generation module is used for generating a driving waveform, and generating an ultrasonic energy driving signal through multi-stage amplification and conversion;
the ultrasonic energy generation module comprises a digital voltage regulation circuit, a power setting circuit, a waveform generation circuit and an ultrasonic drive circuit; the digital voltage regulating circuit, the power setting circuit and the waveform generating circuit are all in communication connection with the ultrasonic driving circuit; the waveform generating circuit is in communication connection with the frequency adjustment phase-locked loop module.
Furthermore, the frequency adjusting phase-locked loop module is used for realizing automatic tracking of frequency and is mutually communicated with the FPGA control module to realize stable output of ultrasonic energy;
the frequency regulation phase-locked loop module comprises a phase discrimination circuit, a voltage control circuit and an oscillation circuit which are sequentially in communication connection; the phase discrimination circuit is in communication connection with the handle; the oscillation circuit is communicatively coupled to the waveform generation circuit.
Furthermore, the power locking module is used for realizing the power stability of the ultrasonic energy through the sampling of current and voltage and the signal conditioning; the power locking module comprises an amplitude discrimination circuit and a power locking circuit which are sequentially in communication connection; the amplitude discrimination circuit is in communication connection with the handle; the power locking circuit is communicatively coupled to the ultrasonic energy generating module.
Further, the energy output module is used for boosting the ultrasonic energy driving signal, conditioning and converting the ultrasonic energy driving signal into required energy, and finishing output.
Furthermore, the protection adjusting module is used for integrating an overvoltage error protection mechanism, an overcurrent error protection mechanism, an over-temperature error protection mechanism and a detuning error protection mechanism, interrupting the driving output when the error mechanism occurs, and displaying the interrupted output on the display screen;
the protection adjustment module comprises a current protection circuit and a voltage protection circuit.
Further, the handle is used for converting electric energy into mechanical energy and acting on the patient to treat; the handle includes a transducer and a cutter.
Further, the phase detection circuit comprises resistors R1-R5, a grounding resistor R6, a resistor R9, resistors R12-R14, a grounding capacitor C2-C3, a capacitor C4, a grounding capacitor C5, a grounding capacitor C9-C10, an operational amplifier U2A, an operational amplifier U2B and an operational amplifier U4A;
one end of the resistor R2 is used as the input end of the phase discrimination circuit; the non-inverting input end of the operational amplifier U2B is connected with the other end of the resistor R2; the inverting input end of the operational amplifier U2B is respectively connected with one end of a grounding resistor R4 and one end of a resistor R5; the positive power supply end of the operational amplifier U2B is respectively connected with a grounding capacitor C2, a grounding capacitor C3 and a +15V power supply; the negative power supply end of the operational amplifier U2B is respectively connected with a grounding capacitor C5, a grounding capacitor C7 and a-15V power supply; the output end of the operational amplifier U2B is respectively connected with one end of the resistor R5 and one end of the capacitor C4; the non-inverting input end of the operational amplifier U2A is respectively connected with the other end of the capacitor C4 and the grounding resistor R6; the inverting input end of the operational amplifier U2A is connected with one end of the resistor R1; the output end of the operational amplifier U2A is respectively connected with the other end of the resistor R1 and one end of the resistor R3; the non-inverting input end of the operational amplifier U4A is respectively connected with the other end of the resistor R3 and one end of the resistor R14; the inverting input end of the operational amplifier U4A is connected with the grounding resistor R12; the positive power supply end of the operational amplifier U4A is respectively connected with the grounding capacitor C9, one end of the resistor R9 and the 3V3 power supply; the negative power supply end of the operational amplifier U4A is grounded; the output end of the operational amplifier U4A is respectively connected with the other end of the resistor R9, one end of the resistor R13 and the other end of the resistor R14; the other end of the resistor R13 is used as the output end of the phase detection circuit and is connected with the grounding capacitor C10.
The invention has the beneficial effects that: the invention provides an ultrasonic main machine which can adjust the system to be always in the optimal resonance state in real time according to the load change of an ultrasonic cutter head, namely, the maximum efficiency of output energy is kept. The frequency adjustment phase-locked loop module of the ultrasonic surgical system can feed back and adjust the output frequency in real time according to the load change in the cutting process, so that the system is always in the optimal resonance state, the ultrasonic energy is stabilized, and the power locking module can realize the power stabilization of the ultrasonic energy according to the sampling and signal conditioning of current and voltage.
Drawings
FIG. 1 is a block diagram of an ultrasonic surgical system;
fig. 2 is a circuit diagram of a phase detection circuit.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides an ultrasonic surgical system, which includes a display screen, an FPGA control module, an excitation control module, an ultrasonic energy generation module, an energy output module, a handle, a frequency adjustment phase-locked loop module, a protection adjustment module, and a power locking module;
the FPGA control module is respectively in communication connection with the display screen, the excitation control module, the ultrasonic energy generation module, the frequency regulation phase-locked loop module and the protection adjustment module; the ultrasonic energy generation module and the handle are in communication connection with the protection adjustment module; the ultrasonic energy generation module, the energy output module and the handle are sequentially in communication connection; the frequency adjusting phase-locked loop module is respectively in communication connection with the ultrasonic energy generating module and the handle; the power locking module is respectively in communication connection with the handle and the ultrasonic energy generation module.
In the embodiment of the invention, the FPGA control module is used for carrying out state detection on the excitation control module, the ultrasonic energy generation module, the energy output module, the handle, the frequency regulation phase-locked loop module, the protection adjustment module and the power locking module, and the specific method is as follows: when the ultrasonic surgical system works, the parameter information of the ultrasonic surgical system is set by using the display screen, the parameter information is received and stored by using the FPGA control module, an excitation command is sent to the ultrasonic energy generation module by using the excitation control module, the excitation command is output to the handle by using the ultrasonic energy output module, and the ultrasonic energy frequency is output by using the frequency adjusting phase-locked loop module; the power locking module is used for outputting ultrasonic energy power, and the FPGA control module is used for detecting whether an excitation command is changed, whether parameter information is changed and whether an ultrasonic surgical system is abnormal.
In an embodiment of the present invention, as shown in fig. 1, the excitation control module includes a handle excitation circuit and a pedal excitation circuit;
the handle excitation circuit is used for conditioning an excitation control signal of the handle and transmitting the excitation control signal to the FPGA control module; the pedal excitation circuit is used for conditioning pedal excitation control signals and transmitting the pedal excitation control signals to the FPGA control module.
In the embodiment of the present invention, as shown in fig. 1, the ultrasonic energy generating module is configured to generate a driving waveform, and generate an ultrasonic energy driving signal through multi-stage amplification and conversion;
the ultrasonic energy generation module comprises a digital voltage regulation circuit, a power setting circuit, a waveform generation circuit and an ultrasonic drive circuit; the digital voltage regulating circuit, the power setting circuit and the waveform generating circuit are all in communication connection with the ultrasonic driving circuit; the waveform generating circuit is in communication connection with the frequency adjustment phase-locked loop module.
In the embodiment of the invention, as shown in fig. 1, the frequency adjustment phase-locked loop module is used for realizing automatic tracking of frequency and is communicated with the FPGA control module to realize stable output of ultrasonic energy;
the frequency regulation phase-locked loop module comprises a phase demodulation circuit, a voltage control circuit and an oscillation circuit which are sequentially connected in a communication manner; the phase demodulation circuit is in communication connection with the handle; the oscillation circuit is communicatively coupled to the waveform generation circuit.
In the embodiment of the present invention, as shown in fig. 1, the power locking module is used for realizing power stabilization of ultrasonic energy through sampling of current and voltage and signal conditioning; the power locking module comprises an amplitude discrimination circuit and a power locking circuit which are sequentially in communication connection; the amplitude discrimination circuit is in communication connection with the handle; the power locking circuit is communicatively coupled to the ultrasonic energy generating module.
In the embodiment of the invention, the energy output module is used for boosting the ultrasonic energy driving signal, conditioning and converting the ultrasonic energy driving signal into the required energy and finishing output.
In the embodiment of the present invention, as shown in fig. 1, the protection adjustment module is configured to integrate an overvoltage error protection mechanism, an overcurrent error protection mechanism, an over-temperature error protection mechanism, and a detuning error protection mechanism, interrupt the driving output when an error mechanism occurs, and display the interrupted output on the display screen;
the protection adjustment module comprises a current protection circuit and a voltage protection circuit. The protection adjustment module integrates hardware and software protection; the hardware protection is realized by an OR gate, when any error occurs, the drive output is interrupted, the software protection is realized by monitoring the states of all parameters, and when the error occurs, the output is interrupted and displayed on a human-computer interaction interface.
In an embodiment of the present invention, as shown in fig. 1, the handle is used to convert electrical energy into mechanical energy and act on the patient to treat the patient; the handle includes a transducer and a cutter.
In the embodiment of the present invention, as shown in fig. 2, the phase detection circuit includes resistors R1 to R5, a ground resistor R6, a resistor R9, resistors R12 to R14, ground capacitors C2 to C3, a capacitor C4, a ground capacitor C5, ground capacitors C9 to C10, an operational amplifier U2A, an operational amplifier U2B, and an operational amplifier U4A;
one end of the resistor R2 is used as the input end of the phase discrimination circuit; the non-inverting input end of the operational amplifier U2B is connected with the other end of the resistor R2; the inverting input end of the operational amplifier U2B is respectively connected with one end of a grounding resistor R4 and one end of a resistor R5; the positive power supply end of the operational amplifier U2B is respectively connected with a grounding capacitor C2, a grounding capacitor C3 and a +15V power supply; the negative power supply end of the operational amplifier U2B is respectively connected with a grounding capacitor C5, a grounding capacitor C7 and a-15V power supply; the output end of the operational amplifier U2B is respectively connected with one end of the resistor R5 and one end of the capacitor C4; the non-inverting input end of the operational amplifier U2A is respectively connected with the other end of the capacitor C4 and the grounding resistor R6; the inverting input end of the operational amplifier U2A is connected with one end of the resistor R1; the output end of the operational amplifier U2A is respectively connected with the other end of the resistor R1 and one end of the resistor R3; the non-inverting input end of the operational amplifier U4A is respectively connected with the other end of the resistor R3 and one end of the resistor R14; the inverting input end of the operational amplifier U4A is connected with the grounding resistor R12; the positive power supply end of the operational amplifier U4A is respectively connected with the grounding capacitor C9, one end of the resistor R9 and the 3V3 power supply; the negative power supply end of the operational amplifier U4A is grounded; the output end of the operational amplifier U4A is respectively connected with the other end of the resistor R9, one end of the resistor R13 and the other end of the resistor R14; the other end of the resistor R13 is used as the output end of the phase detection circuit and is connected with the grounding capacitor C10.
The working principle and the process of the invention are as follows: the FPGA control module is used as the most core module in the system, and after the system is powered on, the FPGA control module detects the states of all functional modules (including a display screen) of the system according to a set program, so that the states of all the modules are normal when a user uses the system. When the ultrasonic energy meter is normally operated, a user sets and changes parameters of the host through the display screen, the FPGA control module receives and stores the parameter information, when the user completes an excitation command through the excitation control module, the FPGA control module sends an instruction to the ultrasonic energy generation module according to the stored parameter information, the ultrasonic energy can be automatically output to the handle at the moment, the power constant module and the frequency regulation phase-locked loop module intervene in a loop, the FPGA control module releases the authority at the moment, and the power constant module and the frequency regulation phase-locked loop module output the ultrasonic energy power and the frequency. The working state of the whole system is monitored at the moment, including whether a user excited command is changed or not, whether parameters are modified or not, whether the system is abnormal or not and the like.
The beneficial effects of the invention are as follows: the invention provides an ultrasonic main machine which can adjust a system to be always in an optimal resonance state in real time according to the load change of an ultrasonic cutter head, namely, the maximum efficiency of output energy is kept. The frequency adjustment phase-locked loop module of the ultrasonic surgical system can feed back and adjust the output frequency in real time according to the load change in the cutting process, so that the system is always in the optimal resonance state, the ultrasonic energy is stabilized, and the power locking module can realize the power stabilization of the ultrasonic energy according to the sampling and signal conditioning of current and voltage.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto and changes may be made without departing from the scope of the invention in its aspects.
Claims (10)
1. An ultrasonic surgical system is characterized by comprising a display screen, an FPGA control module, an excitation control module, an ultrasonic energy generation module, an energy output module, a handle, a frequency regulation phase-locked loop module, a protection adjustment module and a power locking module;
the FPGA control module is respectively in communication connection with the display screen, the excitation control module, the ultrasonic energy generation module, the frequency adjustment phase-locked loop module and the protection adjustment module; the ultrasonic energy generation module and the handle are in communication connection with the protection adjustment module; the ultrasonic energy generation module, the energy output module and the handle are sequentially in communication connection; the frequency adjustment phase-locked loop module is respectively in communication connection with the ultrasonic energy generation module and the handle; the power locking module is respectively connected with the handle and the ultrasonic energy generation module in a communication mode.
2. The ultrasonic surgical system according to claim 1, wherein the FPGA control module is configured to perform status detection on the excitation control module, the ultrasonic energy generation module, the energy output module, the handle, the frequency adjustment phase-locked loop module, the protection adjustment module, and the power locking module by: when the ultrasonic surgical system works, the parameter information of the ultrasonic surgical system is set by using the display screen, the parameter information is received and stored by using the FPGA control module, an excitation command is sent to the ultrasonic energy generation module by using the excitation control module, the excitation command is output to the handle by using the ultrasonic energy output module, and the ultrasonic energy frequency is output by using the frequency adjusting phase-locked loop module; the power locking module is used for outputting ultrasonic energy power, and the FPGA control module is used for detecting whether an excitation command is changed, whether parameter information is changed and whether an ultrasonic surgical system is abnormal.
3. The ultrasonic surgical system of claim 1, wherein the firing control module includes a handle firing circuit and a foot firing circuit;
the handle excitation circuit is used for conditioning an excitation control signal of the handle and transmitting the excitation control signal to the FPGA control module; the pedal excitation circuit is used for conditioning pedal excitation control signals and transmitting the pedal excitation control signals to the FPGA control module.
4. The ultrasonic surgical system of claim 1, wherein the ultrasonic energy generation module is configured to generate a drive waveform, which is converted by a multi-stage amplification to generate an ultrasonic energy drive signal;
the ultrasonic energy generation module comprises a digital voltage regulation circuit, a power setting circuit, a waveform generation circuit and an ultrasonic drive circuit; the digital voltage regulating circuit, the power setting circuit and the waveform generating circuit are all in communication connection with the ultrasonic driving circuit; the waveform generating circuit is in communication connection with the frequency adjustment phase-locked loop module.
5. The ultrasonic surgical system according to claim 4, wherein the frequency adjustment phase-locked loop module is configured to achieve automatic tracking of frequency and communicate with the FPGA control module to achieve stable output of ultrasonic energy;
the frequency regulation phase-locked loop module comprises a phase discrimination circuit, a voltage control circuit and an oscillation circuit which are sequentially in communication connection; the phase discrimination circuit is in communication connection with the handle; the oscillation circuit is communicatively coupled to the waveform generation circuit.
6. The ultrasonic surgical system of claim 1, wherein the power lock module is configured to achieve power stabilization of ultrasonic energy through sampling of current and voltage and signal conditioning; the power locking module comprises an amplitude discrimination circuit and a power locking circuit which are sequentially connected in a communication manner; the amplitude discrimination circuit is in communication connection with the handle; the power locking circuit is communicatively coupled to the ultrasonic energy generating module.
7. The ultrasonic surgical system of claim 1, wherein the energy output module is configured to boost the ultrasonic energy driving signal, condition and convert the ultrasonic energy driving signal into the required energy, and complete the output.
8. The ultrasonic surgical system of claim 1, wherein the protection adjustment module is configured to integrate an over-voltage error protection mechanism, an over-current error protection mechanism, an over-temperature error protection mechanism, and a detuning error protection mechanism, to interrupt the drive output when an error mechanism occurs, and to display the interrupted output on the display screen;
the protection adjustment module comprises a current protection circuit and a voltage protection circuit.
9. The ultrasonic surgical system of claim 1, wherein the handpiece is configured to convert electrical energy to mechanical energy and to act on a patient for treatment; the handle includes a transducer and a cutter.
10. The ultrasonic surgical system of claim 5, wherein the phase detection circuit comprises resistors R1-R5, ground resistor R6, resistor R9, resistors R12-R14, ground capacitors C2-C3, capacitor C4, ground capacitor C5, ground capacitors C9-C10, operational amplifier U2A, operational amplifier U2B, and operational amplifier U4A;
one end of the resistor R2 is used as the input end of the phase discrimination circuit; the non-inverting input end of the operational amplifier U2B is connected with the other end of the resistor R2; the inverting input end of the operational amplifier U2B is respectively connected with one end of a grounding resistor R4 and one end of a resistor R5; the positive power supply end of the operational amplifier U2B is respectively connected with a grounding capacitor C2, a grounding capacitor C3 and a +15V power supply; the negative power end of the operational amplifier U2B is respectively connected with a grounding capacitor C5, a grounding capacitor C7 and a-15V power supply; the output end of the operational amplifier U2B is respectively connected with one end of a resistor R5 and one end of a capacitor C4; the non-inverting input end of the operational amplifier U2A is respectively connected with the other end of the capacitor C4 and the grounding resistor R6; the inverting input end of the operational amplifier U2A is connected with one end of the resistor R1; the output end of the operational amplifier U2A is respectively connected with the other end of the resistor R1 and one end of the resistor R3; the non-inverting input end of the operational amplifier U4A is respectively connected with the other end of the resistor R3 and one end of the resistor R14; the inverting input end of the operational amplifier U4A is connected with the grounding resistor R12; the positive power supply end of the operational amplifier U4A is respectively connected with the grounding capacitor C9, one end of the resistor R9 and the 3V3 power supply; the negative power supply end of the operational amplifier U4A is grounded; the output end of the operational amplifier U4A is respectively connected with the other end of the resistor R9, one end of the resistor R13 and the other end of the resistor R14; and the other end of the resistor R13 is used as the output end of the phase discrimination circuit and is connected with the grounding capacitor C10.
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