CN114681052A - Medical microwave treatment equipment and control method thereof - Google Patents
Medical microwave treatment equipment and control method thereof Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/18—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves
- A61B18/1815—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by applying electromagnetic radiation, e.g. microwaves using microwaves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00696—Controlled or regulated parameters
- A61B2018/00702—Power or energy
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/00773—Sensed parameters
- A61B2018/00791—Temperature
Abstract
The invention discloses medical microwave treatment equipment and a control method thereof. The parameter acquisition and embedded control module acquires the current and temperature real-time value of the power final-stage amplifier and the forward and reverse power of the output end of the radio frequency isolator, and adjusts and controls the power output. The cooling system in the main control and auxiliary function module realizes the internal cooling of the application part through a cooling liquid circulation loop under the control of the main controller; the internal temperature of the application part is sampled by the temperature acquisition system under the control of the main controller, and the power output of the whole system can be cut off by the embedded controller. The man-machine interaction module is connected with the main controller, and the real-time working condition of the system is obtained through the man-machine interaction module. The invention can control and correct the output power of the solid-state microwave source based on the working current, the forward and reverse power and the temperature change, thereby ensuring the safety and reliability of the equipment.
Description
Technical Field
The invention relates to a signal generating device of minimally invasive treatment equipment, in particular to medical microwave treatment equipment and a method for controlling microwave power output.
Background
Microwave technology has been used for decades in surgical coagulation, tissue cutting, ablation treatment of liver and thyroid tumors/nodules, etc. Compared with the traditional surgical operation, the method can obviously reduce the amount of operation bleeding and improve the success rate of the operation, has the effect even comparable to that of surgical excision in the field of treatment of liver and thyroid nodules, has the advantages of small operation wound, quick postoperative recovery, maximum retention of liver function/first function and the like, and is more and more popularized in departments such as interventional (ultrasonic) department, endocrinology department, oncology department, surgery department and the like.
The microwave treatment equipment is internally provided with one or more microwave signal generating devices which mainly adopt two schemes of a magnetron and a solid microwave source, and the magnetron scheme internally comprises a high-voltage transformer module, so that the microwave treatment equipment is short in service life and low in efficiency, and the output power is easy to drift under the influence of temperature due to poor safety caused by large internal working voltage (more than or equal to 1500V), so that the application of the magnetron scheme in the field of medical microwaves is more and more narrow.
The solid microwave source scheme has the advantages of small volume, light weight and higher efficiency than a magnetron scheme, and is increasingly improved in the aspects of accuracy of output power and overall reliability based on continuous development of semiconductor technology, thereby being the application direction of medical microwave equipment.
A high-power 2450MHz solid-state source microwave therapeutic instrument with a patent document grant publication number of CN103271769B is specifically shown in figure 1, and discloses that the therapeutic instrument consists of a crystal oscillator phase-locked microwave oscillator, a solid-state amplifier, a circulator, a microwave power switch, an embedded microprocessor, a liquid crystal touch screen and a power supply, has multiple working frequencies and working modes for selection, and simultaneously has overtemperature alarm and reflected power alarm functions.
1. The temperature change can cause the output power of the solid-state source microwave therapeutic apparatus to deviate, and the patent does not solve the influence of the temperature change on the accuracy of the output power of the solid-state source.
2. Working parameters in the solid-state microwave source, such as forward and reverse power, standing-wave ratio, working current and the like, can change in real time, the working state of the solid-state microwave source cannot be monitored in real time, and the safety of a microwave treatment operation is difficult to guarantee.
Therefore, there is a need to further improve the accuracy of the output power of the solid-state source, the safety and reliability of the operation, and to grasp the operating state of the solid-state microwave source in real time, so that the microwave therapeutic apparatus can respond in real time.
Disclosure of Invention
Aiming at the problems, the medical microwave treatment equipment and the control method thereof provided by the invention can continuously correct the output power of the solid microwave source through a compensation method based on temperature change, and can detect the conditions of the working current, the forward power, the reverse power, the real-time working efficiency, the standing-wave ratio change and the like of the solid microwave source in real time, thereby ensuring that a microwave treatment system composed of the solid microwave source and accessories thereof is safely and reliably used for microwave treatment surgery and reducing the surgical risk.
The medical microwave treatment equipment provided by the invention adopts the following technical scheme:
a medical microwave therapeutic equipment is composed of 6 modules including microwave oscillator, filter and drive module, RF isolating and final amplifying module, parameter acquisition and embedded control module, and master and auxiliary function module.
The filtering and driving module comprises a fixed attenuator, an adjustable attenuator, a filter and a power driving amplifier. The input end of the fixed attenuator is connected with the output end of the microwave oscillator, the input end of the adjustable attenuator is connected with the output end of the fixed attenuator, the input end of the filter is connected with the output end of the adjustable attenuator, the input end of the power driving amplifier is connected with the output end of the filter, and the power driving amplifier consists of a single-stage or multi-stage power driving amplifying circuit.
The radio frequency isolation and final stage amplification module comprises a radio frequency isolator and a power final stage amplifier, wherein the input end of the radio frequency isolator is connected with the output end of the filtering and driving module, and the input end of the power final stage amplifier is connected with the output end of the radio frequency isolator.
The parameter acquisition and embedded control module comprises a current acquisition circuit, a temperature acquisition circuit, a power detection circuit, a switch circuit and an embedded controller, wherein the power detection circuit comprises a power attenuator and a power detector.
The current acquisition circuit and the temperature acquisition circuit acquire current and temperature real-time values from the power final stage amplifier, the embedded controller obtains the current and temperature real-time values and then compares the current and temperature real-time values with preset current threshold values and temperature threshold values, if the current and temperature real-time values exceed the corresponding threshold values, the embedded controller controls the power driving amplifier and the power final stage amplifier to be open-circuited by controlling the switch circuit so as to cut off and control the power output of the solid-state microwave source (56); if the voltage value of the port of the adjustable attenuator is not greater than the corresponding threshold value, the embedded controller adjusts the insertion loss value of the port of the adjustable attenuator according to a temperature/power compensation table prestored in the embedded controller, and then compensates the power of the output port of the power final-stage amplifier so as to ensure the accuracy of the final output power.
The power attenuator is connected between the radio frequency isolator and the power detector, and one input port of the embedded controller is connected with the output port of the power detector. The embedded controller monitors the forward power and the reverse power of the output port of the radio frequency isolator through the power detection circuit, and controls the power driving amplifier and the power final amplifier to be open-circuited to stop power output through controlling the switch circuit if the reverse power exceeds a preset threshold value.
The main control and auxiliary function module comprises a cooling system, a temperature acquisition system, a man-machine interaction module and a main controller. The cooling system comprises a peristaltic pump, a cooling liquid pipe and a cooling liquid circulation loop in the application part.
The peristaltic pump is connected with a control port of the main controller, and the main controller controls the start and stop and the rotating speed of the peristaltic pump. The temperature acquisition system comprises a temperature sensor, an acquisition circuit, a filter circuit and a signal amplification circuit. The temperature sensor is designed in the application part, the signal output end of the temperature acquisition system is connected with the input end of the main controller, when the temperature value obtained by the main controller is higher than a preset threshold value, a cut-off instruction is sent to the embedded controller through the communication circuit and the interface, and the embedded controller controls the power driving amplifier and the power final amplifier to be opened through the switch circuit so as to stop power output. The man-machine interaction module is connected with the main controller, and the real-time working condition of the system is obtained through the man-machine interaction module.
The output frequency of the microwave oscillator can be 2450MHz, 915MHz or 433 MHz.
The adjustable attenuator can be a voltage-controlled diode attenuator.
The output power of the power final amplifier in the radio frequency isolation and final amplification module is generally not higher than 120W.
The real-time working condition of the system is obtained through the man-machine interaction module, namely the main controller obtains real-time temperature, real-time current and real-time forward/backward power values in the system from the embedded controller through the communication circuit and the interface. The real-time standing wave value calculated by the main controller through the forward/reverse power, the real-time efficiency calculated by the real-time current and the forward power are displayed to a user through the human-computer interaction module.
A control method of medical microwave treatment equipment comprises the following steps:
the first step is as follows: the output signal of the microwave oscillator passes through a fixed attenuator, a filter and a power driving amplifier in the filtering and driving module in sequence. The output of the power drive amplifier in the filtering and driving module sequentially passes through a radio frequency isolator and a power final amplifier in the radio frequency isolation and final amplification module. The output of the power final amplifier in the radio frequency isolation and final amplification module is connected to the application part through a radio frequency output interface.
The second step is that: the current acquisition circuit and the temperature acquisition circuit in the parameter acquisition and embedded control module respectively acquire the temperature parameter and the working current parameter of the power final-stage amplifier in the radio frequency isolation and final-stage amplification module and send the temperature parameter and the working current parameter to the embedded controller in the parameter acquisition and embedded control module.
And the other path of output of the radio frequency isolator in the radio frequency isolation and final-stage amplification module is sequentially transmitted to the embedded controller through the power attenuator and the power detector in the acquisition and embedded control module.
The third step: the embedded controller reads the current and temperature real-time values acquired by the current acquisition circuit and the temperature acquisition circuit, and compares the current and temperature real-time values with current threshold values and temperature threshold values preset in the embedded controller:
if the preset threshold value (Imax or Tmax) is exceeded, the embedded controller controls the power driving amplifier and the power final amplifier to be opened through a switch circuit in the acquisition and embedded control module (54) so as to stop power output.
If the output power of the power final amplifier does not exceed the corresponding threshold value (Tmax), the embedded controller adjusts the port voltage value of the adjustable attenuator and the insertion loss value of the adjustable attenuator through the adjustable attenuator connected between the fixed attenuator and the filter according to a temperature/power compensation table prestored in the embedded controller, and then compensates the output port power of the power final amplifier so as to ensure the accuracy of the final output power.
The embedded controller reads the output value of the power detector, monitors the forward power and the reverse power of the output port of the radio frequency isolator, and controls the power driving amplifier and the power final amplifier to be open-circuited to stop power output by controlling the switch circuit if the reverse power exceeds a preset threshold value.
The fourth step: in the main control and auxiliary function module, the temperature acquisition system sends the signals of the temperature sensors arranged in the application components to the main controller after sequentially passing through the acquisition circuit, the filter circuit and the signal amplification circuit.
The main controller compares the signal of the temperature sensor with an internal preset threshold value, when the temperature value is higher than the preset threshold value, the main controller sends a cut-off instruction to the embedded controller through the communication circuit and the interface, and then the embedded controller controls the power driving amplifier and the power final amplifier to be opened through the switching circuit, so that the power output of the whole system is cut off.
The fifth step: in the main control and auxiliary function module, the main controller controls the start, stop and rotating speed of a peristaltic pump in the cooling system.
The peristaltic pump, the cooling liquid pipe and the cooling liquid circulation loop in the application part form a cooling liquid circulation passage.
The man-machine interaction module is connected with the main controller, the real-time working condition of the system is obtained through the man-machine interaction module, and the main controller obtains the real-time temperature, the real-time current and the real-time forward/backward power value in the system from the embedded controller through the communication circuit and the interface. The real-time standing wave value calculated by the main controller through the forward/reverse power, the real-time efficiency calculated by the real-time current and the forward power are displayed to a user through the human-computer interaction module.
The invention has the beneficial effects that: the output power of the solid-state microwave source is continuously corrected through a compensation method based on temperature change, meanwhile, the working current, the forward power and the reverse power, the real-time working efficiency and the standing-wave ratio change condition of the solid-state microwave source can be detected in real time, the microwave treatment system composed of the solid-state microwave source and accessories thereof is guaranteed to be safely and reliably used for microwave treatment surgery, and the surgery risk is reduced.
Drawings
FIG. 1 is a prior art drawing;
FIG. 2 is a system block diagram of the microwave treatment apparatus of the present invention;
FIG. 3 is a block diagram of a cooling system of the present invention;
FIG. 4 is a block diagram of a temperature acquisition system of the present invention;
FIG. 5 is a schematic diagram of the external interface and application components of the microwave treatment system according to the present invention;
fig. 6 is a table of temperature-power compensation according to the present invention.
Wherein: 51-a microwave oscillator, 52-a filtering and driving module, 53-a radio frequency isolation and final stage amplification module, 54-a parameter acquisition and embedded control module, 55-a main control and auxiliary function module and 56-a solid-state microwave source.
In fig. 6: p is the preset power; preal1 — actual output power; tn is a temperature real-time value collected by the embedded controller; Δ Pn — the difference between the preset power P and the actual output power Preal.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 2, the medical microwave therapy device of the present invention comprises 6 modules, which are respectively a microwave oscillator 51, a filtering and driving module 52, a radio frequency isolation and final stage amplification module 53, a parameter acquisition and embedded control module 54, and a main control and auxiliary function module 55, wherein the power module provides the necessary power supply for the above 5 modules, and the cascade relationship between the modules and each other will be described in detail below.
The microwave oscillator 51 is a signal generating device of the whole system, can be designed into 2450MHz or 915MHz according to clinical needs, and can be realized by a generating device with high reliability, good stability and low noise, in the embodiment, the integrated VCO ultra-low noise and ultra-low parasitic 0.37GHz to 6.39GHz integer N PLL synthesizer LTC6946 is used as a microwave oscillation source, so that the 2450MHz output frequency requirement can be realized. The frequency of the microwave oscillator 51 may also be 433 MHz.
The filtering and driving module 52 is the lower stage of the microwave oscillator, mainly used to meet the input power requirement of the final power amplifier, and is composed of a fixed attenuator, an adjustable attenuator, a filter, and a power driving amplifier. The input end of the fixed attenuator is connected with the output end of the microwave oscillator 51, and the fixed attenuator is mainly used for inhibiting the input power from being too high, so that the power final-stage amplifier is saturated too early, and the linearity is poor. The input end of the adjustable attenuator is connected with the output end of the fixed attenuator, and the adjustable attenuator mainly aims to solve the problem of poor accuracy of the output power of the power final-stage amplifier caused by temperature change. The adjustable attenuator can select the voltage-controlled diode attenuator, and when the temperature changes, the embedded controller can adjust the voltage value of the diode attenuator according to the temperature so as to control the insertion loss value of the diode attenuator, thereby achieving the purpose of compensating and adjusting the output end power of the power final-stage amplifier. The input end of the filter is connected with the output end of the adjustable attenuator, the filter is used for filtering other frequency signals and preventing noise signals from entering a lower-level power driving amplifier and finally interfering the normal working frequency, and the medical microwave frequency mainly comprises 2450MHz and 915MHz, so that the filter is generally realized by a high-pass filter circuit. The input end of the power driving amplifier is connected with the output end of the filter, and the power driving amplifier can be composed of a single-stage or multi-stage power driving amplifying circuit, and is used for amplifying the output power passing through the filter so as to meet the requirement of sufficient power input of a rear stage (radio frequency isolator).
The rf isolator and final stage amplifier module 53 mainly includes two parts, i.e., an rf isolator and a power final stage amplifier. For microwave therapy equipment, a standing wave is increased and reflected power is increased due to poor connection of a certain point of a microwave transmission channel, and if the transmitted power is not inhibited/isolated, a superior module is damaged, so that a radio frequency isolator needs to be added between a power driving amplifier and a power final amplifier, and the radio frequency isolator can prevent the loss of a superior circuit due to the increase of the reflected power under the conditions of load mismatch and open circuit. The input end of the power final amplifier is connected with the output end of the radio frequency isolator, and the power final amplifier is used for finally amplifying the power of the output end of the radio frequency isolator so that the output power of the microwave treatment equipment meets the expected power requirement, the output power of the medical microwave treatment equipment is generally not higher than 120W, in the embodiment, the radio frequency isolator is realized by a WG1925X-1-30 device, and the power final amplifier is still realized by an LDMOS transistor.
The parameter acquisition and embedded control module 54 includes a current acquisition circuit, a temperature acquisition circuit, a power detection circuit (including a power attenuator), a switch circuit, and an embedded controller. The current acquisition circuit and the temperature acquisition circuit acquire current and temperature real-time values from the power final stage amplification circuit (the power final stage amplifier is a circuit module with the maximum current and temperature), the embedded controller obtains the current and temperature real-time values and then compares the current and temperature real-time values with a preset current threshold value Imax and a preset temperature threshold value Tmax, if the current and temperature real-time values exceed the corresponding threshold values, the embedded controller controls the power drive amplifier and the power final stage amplifier to be open-circuited through the control switch circuit so as to cut off and control the power output of the solid-state microwave source, and the current threshold value Imax can be measured through experiments. If none of the thresholds is exceeded, the embedded controller compensates the power according to a pre-stored temperature-power compensation table, as shown in fig. 6, to correct the output power. Where P in fig. 6 is the preset power, and Δ Pn is the difference between the preset power P and the actual power Preal of the power meter, and the table can be obtained through experiments. The power of the output port of the power final amplifier of the medical microwave treatment equipment is compensated by adjusting the port voltage value of the adjustable attenuator and the insertion loss value of the adjustable attenuator, so that the accuracy of the final output power is ensured. The temperature-power compensation table is measured by experiments and stored in Flash of the embedded controller.
Here, the current threshold Imax is the maximum current value of normal operation, and generally, when the solid-state microwave source is even with an abnormal device, the current value increases abnormally, for example, the operating current is not higher than 10A under normal conditions, and at this time, 16A is reached, but at this time, the power output is still within a controllable range, and if the current is higher, other devices are burned out successively, so that at this time, a protection mechanism is required to cut off the power output, so as to protect the solid-state microwave source from the current angle, and therefore, the current threshold Imax can be set to be 16A.
The power detection circuit consists of a power attenuator and a power detector, wherein the power attenuator is connected with the output port of the radio frequency isolator and is connected with the input port of the power detector. An input port of the embedded controller is connected with an output port of the power detector, the embedded controller can monitor the forward power and the reverse power of the output port of the radio frequency isolator through the power detection circuit, and if the reverse power exceeds a preset threshold value, the embedded controller can control the power driving amplifier and the power final amplifier to be open-circuited through controlling the switch circuit so as to stop power output, so that the protection effect on the whole system is achieved.
The main control and auxiliary function module 55 comprises a cooling system, a temperature acquisition system, a man-machine interaction module and a main controller. As shown in fig. 3, the cooling system is composed of a peristaltic pump, a cooling liquid pipe and a cooling liquid circulation loop in the application part, the peristaltic pump is connected with one port of the main controller, and the main controller controls the start/stop and the rotation speed of the peristaltic pump, so as to control the cooling start/stop and the water flow of the whole cooling system. The cooling system can reduce the temperature of the application part and prevent the application part from scalding the body surface of a patient. As shown in fig. 4, the temperature acquisition system is composed of a temperature sensor, a data acquisition circuit, a filter circuit, a signal amplification circuit, etc., the temperature sensor is designed inside the application component, the signal output end (the output end of the temperature acquisition system) is connected with the other path of the main controller, and when the temperature value obtained by the main controller is higher than the preset threshold value, the main controller also sends a cut-off instruction to the embedded controller, so as to cut off the power output of the whole system. The man-machine interaction module is connected with the main controller, and the implementation working conditions of the system can be obtained through the man-machine interaction module, such as: the real-time temperature, the real-time current and the real-time forward/reverse power in the system, and in addition, the real-time standing wave value calculated by the main controller through the forward/reverse power and the real-time efficiency calculated by the real-time current and the forward power can also be displayed to a user through the human-computer interaction module.
The power module is responsible for the power supply of the whole medical microwave treatment equipment and has the functions of rectification, voltage reduction, isolation and the like. The voltage of a general port of the power final amplifier is 28 +/-1V, the voltage of a general power supply of a peristaltic pump in the cooling system is 24V, the voltage of a general port of the embedded controller, the main controller and the filtering and driving end circuit is 5V or 3.3V, and the power supply module is responsible for voltage conversion and power supply of all the modules/circuits and requires that the output power is not lower than 400W.
Claims (6)
1. A medical microwave treatment device, characterized in that: the device comprises a microwave oscillator (51), a filtering and driving module (52), a radio frequency isolation and final stage amplification module (53), a parameter acquisition and embedded control module (54) and a main control and auxiliary function module (55);
the filtering and driving module (52) comprises a fixed attenuator, an adjustable attenuator, a filter and a power driving amplifier; the input end of the fixed attenuator is connected with the output end of the microwave oscillator (51), the input end of the adjustable attenuator is connected with the output end of the fixed attenuator, the input end of the filter is connected with the output end of the adjustable attenuator, the input end of the power driving amplifier is connected with the output end of the filter, and the power driving amplifier consists of a single-stage or multi-stage power driving amplifying circuit;
the radio frequency isolation and final stage amplification module (53) comprises a radio frequency isolator and a power final stage amplifier; the input end of the radio frequency isolator is connected with the output end of the filtering and driving module (52), and the input end of the power final amplifier is connected with the output end of the radio frequency isolator;
the parameter acquisition and embedded control module (54) comprises a current acquisition circuit, a temperature acquisition circuit, a power detection circuit, a switch circuit and an embedded controller; the power detection circuit comprises a power attenuator and a power detector;
the current acquisition circuit and the temperature acquisition circuit acquire current and temperature real-time values from the power final-stage amplifier, the embedded controller obtains the current and temperature real-time values and then compares the current and temperature real-time values with a preset current threshold value (Imax) and a preset temperature threshold value (Tmax), and if the current and temperature real-time values exceed the corresponding threshold values, the embedded controller controls the power driving amplifier and the power final-stage amplifier to be open-circuited by controlling the switch circuit so as to cut off and control the power output of the solid-state microwave source (56); if the voltage values do not exceed the corresponding threshold values, the embedded controller adjusts the insertion loss value of the adjustable attenuator by adjusting the port voltage value of the adjustable attenuator according to a temperature/power compensation table prestored in the embedded controller, and then compensates the power of the output port of the power final-stage amplifier so as to ensure the accuracy of the final output power;
the power attenuator is connected between the radio frequency isolator and the power detector, and one input port of the embedded controller is connected with the output port of the power detector; the embedded controller monitors the forward power and the reverse power of the output port of the radio frequency isolator through the power detection circuit, and controls the power driving amplifier and the power final amplifier to be open-circuited to stop power output through controlling the switch circuit if the reverse power exceeds a preset threshold value;
the main control and auxiliary function module (55) comprises a cooling system, a temperature acquisition system, a man-machine interaction module and a main controller; the cooling system comprises a peristaltic pump, a cooling liquid pipe and a cooling liquid circulation loop in the application part;
the peristaltic pump is connected with a control port of the main controller, and the main controller controls the start and stop and the rotating speed of the peristaltic pump; the temperature acquisition system comprises a temperature sensor, an acquisition circuit, a filter circuit and a signal amplification circuit; the temperature sensor is designed in the application part, the signal output end of the temperature acquisition system is connected with the input end of the main controller, when the temperature value obtained by the main controller is higher than a preset threshold value, a cut-off instruction is sent to the embedded controller through the communication circuit and the interface, and the embedded controller controls the power driving amplifier and the power final amplifier to be open-circuited through the switch circuit so as to stop power output; the man-machine interaction module is connected with the main controller, and the real-time working condition of the system is obtained through the man-machine interaction module.
2. A medical microwave treatment device according to claim 1, wherein: the output frequency of the microwave oscillator (51) is 2450MHz, 915MHz or 433 MHz.
3. A medical microwave treatment device according to claim 2, wherein: the adjustable attenuator is a voltage-controlled diode attenuator.
4. A medical microwave treatment device according to claim 3, wherein: the output power of the power final amplifier in the radio frequency isolation and final amplification module (53) is not higher than 120W.
5. A medical microwave treatment device according to claim 4, wherein: the real-time working condition of the system is obtained through the man-machine interaction module, and the main controller obtains the real-time temperature, the real-time current and the real-time forward/backward power value in the system from the embedded controller through the communication circuit and the interface; the real-time standing wave value calculated by the main controller through the forward/reverse power, the real-time efficiency calculated by the real-time current and the forward power are displayed to a user through the human-computer interaction module.
6. A control method of medical microwave treatment equipment is characterized by comprising the following steps:
the first step is as follows: the output signal of the microwave oscillator (51) passes through a fixed attenuator, a filter and a power driving amplifier in a filtering and driving module (52) in sequence; the output of the power drive amplifier in the filtering and driving module (52) passes through a radio frequency isolator and a power final amplifier in the radio frequency isolation and final amplification module (53) in sequence; the output of the power final amplifier in the radio frequency isolation and final amplification module (53) is connected to the application part through a radio frequency output interface;
the second step is that: a current acquisition circuit and a temperature acquisition circuit in the parameter acquisition and embedded control module (54) respectively acquire the temperature parameter and the working current parameter of a power final amplifier in the radio frequency isolation and final amplification module (53) and send the temperature parameter and the working current parameter to an embedded controller in the parameter acquisition and embedded control module (54);
the other path of output of the radio frequency isolator in the radio frequency isolation and final stage amplification module (53) is sequentially transmitted to the embedded controller through the power attenuator and the power detector in the acquisition and embedded control module (54);
the third step: the embedded controller reads the current and temperature real-time values acquired by the current acquisition circuit and the temperature acquisition circuit, and compares the current and temperature real-time values with a current threshold value (Imax) and a temperature threshold value (Tmax) preset in the embedded controller:
if the preset threshold value (Imax or Tmax) is exceeded, the embedded controller controls the power driving amplifier and the power final amplifier to be open-circuited through a switch circuit in the acquisition and embedded control module (54) so as to stop power output;
if the output power does not exceed the corresponding threshold value (Tmax), the embedded controller adjusts the port voltage value of the adjustable attenuator and the insertion loss value of the adjustable attenuator according to a temperature/power compensation table prestored in the embedded controller through the adjustable attenuator connected between the fixed attenuator and the filter, and then compensates the power of the output port of the power final amplifier so as to ensure the accuracy of the final output power;
the embedded controller reads the output value of the power detector, monitors the forward power and the reverse power of the output port of the radio frequency isolator, and controls the power driving amplifier and the power final amplifier to be open-circuited to stop power output by controlling the switch circuit if the reverse power exceeds a preset threshold value;
the fourth step: in the main control and auxiliary function module (55), a temperature acquisition system transmits a temperature sensor signal arranged in an application part to a main controller after sequentially passing through an acquisition circuit, a filter circuit and a signal amplification circuit;
the main controller compares the signal of the temperature sensor with an internal preset threshold value, when the temperature value is higher than the preset threshold value, the main controller sends a cut-off instruction to the embedded controller through the communication circuit and the interface, and then the embedded controller controls the power driving amplifier and the power final amplifier to be opened through the switching circuit, so that the power output of the whole system is cut off;
the fifth step: in the main control and auxiliary function module (55), a main controller controls the start, stop and rotating speed of a peristaltic pump in the cooling system; the peristaltic pump, the cooling liquid pipe and a cooling liquid circulation loop in the application part form a cooling liquid circulation passage;
the man-machine interaction module is connected with the main controller, the real-time working condition of the system is obtained through the man-machine interaction module, and the main controller obtains the real-time temperature, the real-time current and the real-time forward/backward power value in the system from the embedded controller through the communication circuit and the interface; the real-time standing wave value calculated by the main controller through the forward/reverse power, the real-time efficiency calculated by the real-time current and the forward power are displayed to a user through the human-computer interaction module.
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| CN202210411255.1A Pending CN114681052A (en) | 2022-04-19 | 2022-04-19 | Medical microwave treatment equipment and control method thereof |
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| Country | Link |
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| CN (1) | CN114681052A (en) |
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