Radio frequency ablation power supply system and control method

Abstract

The invention discloses a radio frequency ablation power supply system and a control method, the radio frequency ablation power supply system comprises an AC / DC circuit, a pre-stage DC / DC circuit, a DC / AC circuit, a filter circuit and a radio frequency electrode which are electrically connected in sequence, the radio frequency ablation power supply system further comprises a control circuit, and the control circuit is electrically connected with the pre-stage DC / DC circuit, the DC / AC circuit and the filter circuit. The control circuit is composed of a microcontroller and a logic gate array, due to the fact that the microcontroller controls sequential execution and has many parallel execution requirements for the radiofrequency ablation technology with the high safety requirement, the logic gate array is a field programmable hardware circuit, all signals are executed in parallel, and the safety of the radiofrequency ablation technology is greatly improved. And the requirement of the microcontroller on parallel execution is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of radio frequency equipment, and in particular relates to a radio frequency ablation power supply system and a control method. Background Art

[0002] In radiofrequency ablation therapy, the stability, reliability and safety of the radiofrequency ablation power system are of great importance. The most important factor that directly affects these is the selection of the radiofrequency ablation power system control scheme.

[0003] In the related technology, the core of the radiofrequency ablation power supply system is to use a microcontroller or DSP as a microcontroller, which completes the detection of signal status, data processing, data transmission, interrupt processing in special situations, etc. However, for radiofrequency ablation products with high safety requirements, multiple signals are often required to be processed in parallel. Simply controlling through a microcontroller is a heavy burden, and the real-time performance of signal processing is insufficient, making it difficult to meet safety requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a radio frequency ablation power supply system and a control method to solve the problem that the safety and real-time performance of radio frequency equipment signals are difficult to meet in the prior art.

[0005] To this end, the first aspect of the present invention provides a radiofrequency ablation power supply system, comprising an AC / DC circuit, a front-stage DC / DC circuit, a DC / AC circuit, a filter circuit and a radiofrequency electrode electrically connected in sequence,

[0006] It also includes a control circuit, which is electrically connected to the front-stage DC / DC circuit, the DC / AC circuit and the filter circuit.

[0007] Preferably, the control circuit includes a main auxiliary DC / DC circuit and a sub-auxiliary DC / DC circuit.

[0008] Preferably, the main-auxiliary DC / DC circuit comprises a microcontroller and a logic gate array, and the microcontroller and the logic gate array are electrically connected.

[0009] Preferably, the main auxiliary DC / DC circuit also includes a first digital-to-analog converter and a threshold control circuit, and the secondary auxiliary DC / DC circuit also includes a front-stage DC / DC circuit drive circuit and a DC / AC circuit drive circuit, the first digital-to-analog converter is electrically connected to the microcontroller, the threshold control circuit is electrically connected to the first digital-to-analog converter, the front-stage DC / DC circuit drive circuit is electrically connected to the threshold control circuit, the front-stage DC / DC circuit drive circuit is electrically connected to the front-stage DC / DC circuit, the front-stage DC / DC circuit is electrically connected to the threshold control circuit, and the DC / AC drive circuit is electrically connected to the DC / AC circuit and the logic gate array.

[0010] Preferably, the main-auxiliary DC / DC circuit also includes a second digital-to-analog converter and a power over-limit detection module, the microcontroller is electrically connected to the second digital-to-analog converter, the power over-limit detection module is electrically connected to the second digital-to-analog converter, and the logic gate array is electrically connected to the power over-limit detection module.

[0011] Preferably, the main-auxiliary DC / DC circuit further includes a front-stage detection circuit, and the front-stage detection circuit is electrically connected to the front-stage DC / DC circuit, the microcontroller and the logic gate array.

[0012] Preferably, the main-auxiliary DC / DC circuit further includes an auxiliary circuit state detection module, and the auxiliary circuit state detection module is electrically connected to the microcontroller and the logic gate array.

[0013] Preferably, the main-auxiliary DC / DC circuit further includes a post-stage detection circuit, and the post-stage detection circuit is electrically connected to the filter circuit and the logic gate array.

[0014] Preferably, a temperature sensor is provided in the radio frequency electrode, and the temperature sensor is electrically connected to the microcontroller.

[0015] In the second aspect, a control method for a radio frequency ablation power supply system is provided, which is used for the radio frequency ablation power supply system, comprising the following steps: converting AC power into DC power through an AC / DC circuit and transmitting it to the front-stage DC / DC circuit, the control circuit feedback adjusts the output voltage of the front-stage DC / DC circuit, the DC / AC circuit converts the DC voltage of the front-stage DC / DC circuit into AC voltage, outputs radio frequency power to the filter circuit, and then outputs it through the radio frequency electrode.

[0016] Beneficial effects:

[0017] The present invention provides a radiofrequency ablation power supply system and a control method. The control circuit is composed of a microcontroller and a logic gate array. Since the microcontroller control is sequential execution, and there are more parallel execution requirements in the radiofrequency ablation technology with higher safety requirements, the logic gate array is a field programmable hardware circuit, and each signal is executed in parallel, which makes up for the microcontroller's demand for parallel execution.

[0018] Microcontrollers cannot perform synchronous acquisition of multi-channel ADCs, but logic gate arrays are flexible in configuration and can perform synchronous acquisition of multi-channel ADCs, thus ensuring the controllability of parameters during the PID closed-loop control of radiofrequency ablation. The radiofrequency ablation power supply system uses a microcontroller and a logic gate array to greatly improve the efficiency of the microcontroller, and for the radiofrequency ablation system, it greatly improves its safety and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The circuit diagram of an embodiment of a radio frequency ablation power supply system in the present invention.

[0021] Figure 2 This is a circuit diagram of a control circuit of another embodiment of a radio frequency ablation power system in the present invention.

[0022] In the figure, 1-AC / DC circuit, 2-front-stage DC / DC circuit, 3-DC / AC circuit, 4-filter circuit, 5-RF electrode, 51-temperature sensor, 6-control circuit, 61-main auxiliary DC / DC circuit, 62-secondary auxiliary DC / DC circuit, 63-microcontroller, 64-logic gate array, 65-first digital-to-analog converter, 66-threshold control circuit, 67-front-stage detection circuit, 68-auxiliary circuit status detection module, 69-second digital-to-analog converter, 610-power over-limit detection module, 611-rear-stage detection circuit, 612-front-stage DC / DC circuit drive circuit, 613-DC / AC drive circuit. DETAILED DESCRIPTION

[0023] The content of the present invention can be more easily understood by selecting the following detailed description of the preferred implementation method of the present invention and the embodiments included. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those of ordinary skill in the art to which the present invention belongs. When there is a conflict, the definition in this specification shall prevail.

[0024] Embodiment 1:

[0025] like Figure 1 As shown, the first aspect of this embodiment provides a radio frequency ablation power supply system, including an AC / DC circuit 1, a front-stage DC / DC circuit 2, a DC / AC circuit 3, a filter circuit 4 and a radio frequency electrode 5 electrically connected in sequence, and also includes a control circuit 6, and the control circuit 6 is electrically connected to the front-stage DC / DC circuit 2, the DC / AC circuit 3 and the filter circuit 4. Among them, the AC / DC circuit 1 is used to convert the mains electricity into direct current to provide power input for the radio frequency ablation power supply system. The front-stage DC / DC circuit 2 is used to boost the direct current of the AC / DC circuit 1. The DC / AC circuit 3 is used to convert the DC voltage of the front-stage DC / DC circuit 2 into an alternating voltage to output radio frequency power.

[0026] like Figure 2 As shown, the control circuit 6 includes a main auxiliary DC / DC circuit 61 and a sub-auxiliary DC / DC circuit 62. The main auxiliary DC / DC circuit 61 is used to provide power to the microcontroller 63, logic gate array 64, first digital-to-analog converter 65, threshold control circuit 66, front-stage detection circuit 67, auxiliary circuit state detection module 68, second digital-to-analog converter 69, power over-limit detection module 610, and back-stage detection circuit 611 in the system, and converts the output of the AC / DC circuit 1 and provides it to the system for use without control. The sub-auxiliary DC / DC circuit 62 is used to provide a higher voltage to the front-stage DC / DC circuit drive circuit 612 and the DC / AC circuit drive circuit 613 to meet the requirements of driving the switch tube; the sub-auxiliary DC / DC circuit 62 is indirectly controlled by the microcontroller 63 and directly controlled by the logic gate array 64.

[0027] The main auxiliary DC / DC circuit 61 includes a microcontroller 63 and a logic gate array 64, and the microcontroller 63 and the logic gate array 64 are electrically connected. There are multiple enable signals and data transmission lines between the microcontroller 63 and the logic gate array 64, which can realize the enable control of multiple parallel signals. At the same time, the logic gate array 64 can upload the collected data to the microcontroller 63 for processing and control. The microcontroller is an MCU and the logic gate array is an FPGA. Since the microcontroller 63 cannot perform synchronous acquisition of multi-channel ADC, and the logic gate array 64 is flexibly configured, it can flexibly perform synchronous acquisition of multi-channel ADC, thus ensuring the controllability of parameters in the PID closed-loop control process of radiofrequency ablation. The radiofrequency ablation power supply system adopts the method of using a microcontroller 63 and a logic gate array 64 in combination, which can greatly increase the use efficiency of the microcontroller 63, and for the radiofrequency ablation system, it greatly improves its safety and reliability.

[0028] The main auxiliary DC / DC circuit 61 further includes a first digital-to-analog converter 65 and a threshold control circuit 66, and the auxiliary DC / DC circuit 62 further includes a front-stage DC / DC circuit driving circuit 612 and a DC / AC circuit driving circuit 613. The first digital-to-analog converter 65 is electrically connected to the microcontroller 63, the threshold control circuit 66 is electrically connected to the first digital-to-analog converter 65, the front-stage DC / DC circuit driving circuit 612 is electrically connected to the threshold control circuit 66, the front-stage DC / DC circuit driving circuit 612 is electrically connected to the front-stage DC / DC circuit 2, the front-stage DC / DC circuit 2 is electrically connected to the threshold control circuit 66, and the front-stage DC / DC circuit driving circuit 612 is electrically connected to the DC / AC circuit 3 and the logic gate array 64. The front-stage DC / DC circuit driving circuit 612 is used to control the voltage of the front-stage DC / DC circuit 2, and the voltage signal of the first digital-to-analog converter 65 and the voltage signal output by the front-stage DC DC / DC circuit are processed by the threshold control circuit 66 to obtain a signal that can change the duty cycle of its PWM driving signal. The DC / AC circuit driving circuit 613 is used to process the PWM signal output by the logic gate array 64 to drive the switch tube in the DC / AC circuit 3, so as to convert the direct current of the previous DC / DC circuit 2 into alternating current with the same frequency as the PWM signal.

[0029] The main auxiliary DC / DC circuit 61 also includes a second digital-to-analog converter 69 and a power over-limit detection module 610. The microcontroller 63 is electrically connected to the second digital-to-analog converter 69, the power over-limit detection module 610 is electrically connected to the second digital-to-analog converter 69, and the logic gate array 64 is electrically connected to the power over-limit detection module 610. The power over-limit detection is used to output a preset power comparison voltage signal from the microcontroller 63, compare the power signal in the front-stage detection circuit 67, and output a trigger signal to the logic gate array 64 when the detected power signal voltage is greater than the preset power voltage. After a 100ms delay process, if the trigger signal is still valid, the PWM signal is disabled.

[0030] The main auxiliary DC / DC circuit 61 also includes a pre-stage detection circuit 67, which is electrically connected to the pre-stage DC / DC circuit 2, the microcontroller 63 and the logic gate array 64. The pre-stage detection circuit 67 is used to detect the voltage and current of the pre-stage DC / DC circuit 2, the voltage and current in the DC / AC circuit 3, the temperature and power and other signals. The detection signal of the pre-stage detection circuit 67 includes the voltage output by the pre-stage DC / DC circuit 2, the source current of the switch tube in the pre-stage DC / DC circuit 2, the source current of the two switch tubes in the DC / AC circuit 3, the drain voltage of the two switch tubes in the DC / AC circuit 3, and the power signal obtained by analog multiplication of the source current and the drain voltage of the switch tube in the DC / AC circuit 3. These analog signals are processed by the microcontroller 63.

[0031] The main auxiliary DC / DC circuit 61 also includes an auxiliary circuit state detection module 68, which is electrically connected to the microcontroller 63 and the logic gate array 64. The auxiliary circuit state detection module 68 is used to detect the states of the main auxiliary DC / DC circuit 61 and the auxiliary auxiliary DC / DC circuit 62 to ensure that the main auxiliary DC / DC circuit 61 and the auxiliary auxiliary DC / DC circuit 62 operate normally, so that the states of each circuit in the system can be detected.

[0032] The main auxiliary DC / DC circuit 61 also includes a post-stage detection circuit 611, which is electrically connected to the filter circuit 4 and the logic gate array 64. The post-stage detection circuit 611 is composed of two mutual inductors and a digital-to-analog converter for synchronous detection, and is used to synchronously collect the voltage and current of the RF circuit processed by the filter circuit 4 through the digital-to-analog converter. The post-stage detection circuit 611 detects the voltage and current signals at the output end of the RF circuit, periodically detects a group of synchronization signals, and uploads the data after continuous detection to the microcontroller 63. The microcontroller 63 obtains the parameters of the voltage effective value, current effective value, voltage and current phase difference, RF electrode 5 power or electrode impedance at the RF end after fitting.

[0033] The RF electrode 5 is provided with a temperature sensor 51, which is electrically connected to the microcontroller 63. The temperature of the temperature sensor 51 forms a closed loop with the microcontroller 63, DAC1, threshold control circuit 66, front-stage DC / DC circuit drive circuit 612, DC / AC circuit 3, filter circuit 4, and RF electrode 5, and the PID algorithm control is used to realize the rapid temperature rise of the RF electrode 5 and the constant temperature control according to the preset temperature.

[0034] In the second aspect, a control method for a radio frequency ablation power supply system is provided, which is used for a radio frequency ablation power supply system, comprising the following steps: converting AC power into DC power through an AC / DC circuit 1 and transmitting it to a front-stage DC / DC circuit 2, a control circuit 6 feedback-adjusting the output voltage of the front-stage DC / DC circuit 2, a DC / AC circuit 3 converting the DC voltage of the front-stage DC / DC circuit 2 into an AC voltage, outputting radio frequency power to a filter circuit 4, and then outputting it through a radio frequency electrode 5.

[0035] The AC power first enters the AC / DC circuit 1, which converts the AC power into direct current to provide power input for the entire radiofrequency ablation power system.

[0036] The direct current output by the AC / DC circuit 1 enters the front-stage DC / DC circuit 2, which performs a voltage-boosting operation on the direct current. The output power of the front-stage DC / DC circuit 2 is adjustable, and this adjustment process is controlled by the front-stage DC / DC circuit 2 driving circuit. The front-stage DC / DC circuit 2 driving circuit performs calculation processing on the voltage signal output by the first digital-to-analog converter 65 and the voltage signal output by the front-stage DC / DC circuit 2 through the threshold control circuit 66. Through this calculation processing, a signal that can change the duty cycle of its PWM drive signal is obtained, thereby realizing the adjustment of the output power of the front-stage DC / DC circuit 2.

[0037] The front-stage detection circuit 67 collects the voltage and current of the front-stage DC / DC circuit 2, the voltage and current in the DC / AC circuit 3, the temperature and power signals, and is used to monitor the working status of the front-stage circuit in real time. The auxiliary circuit status detection module 68 detects the status of the main auxiliary DC / DC circuit 61 and the auxiliary auxiliary DC / DC circuit 62 to ensure that the status of each auxiliary circuit in the system can be accurately monitored so as to promptly discover and handle possible problems.

[0038] The PWM signal output by the logic gate array 64 is processed by the DC / AC circuit driving circuit 613 and then used to drive the switch tube in the DC / AC circuit 3. Through this driving, the DC / AC circuit 3 can convert the direct current output by the previous DC / DC circuit 2 into alternating current with the same frequency as the PWM signal, thus realizing the conversion of the electric energy form from direct current to alternating current, and providing a suitable power supply form for subsequent radio frequency processing.

[0039] The voltage and current signals of the RF circuit processed by the filter circuit 4 are synchronously collected by the ADC of the post-stage detection circuit 611. The collected data can be used to further analyze the working state of the RF circuit, for example, to determine whether the power is within the normal range.

[0040] The voltage and current signals of the radio frequency circuit processed by the filter circuit 4 are outputted through the radio frequency electrode 5. The temperature is fed back to the microcontroller 63 in real time through the temperature sensor 51 in the radio frequency electrode 5 to maintain constant temperature control.

[0041] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A radiofrequency ablation power supply system, characterized in that: It includes an AC / DC circuit, a front-stage DC / DC circuit, a DC / AC circuit, a filter circuit and a radio frequency electrode which are electrically connected in sequence. It also includes a control circuit, which is electrically connected to the front-stage DC / DC circuit, the DC / AC circuit and the filter circuit.

2. A radiofrequency ablation power supply system according to claim 1, characterized in that: The control circuit includes a main auxiliary DC / DC circuit and a sub-auxiliary DC / DC circuit.

3. A radiofrequency ablation power supply system according to claim 2, characterized in that: The main auxiliary DC / DC circuit includes a microcontroller and a logic gate array, and the microcontroller and the logic gate array are electrically connected.

4. A radiofrequency ablation power supply system according to claim 3, characterized in that: The main auxiliary DC / DC circuit also includes a first digital-to-analog converter and a threshold control circuit, and the secondary auxiliary DC / DC circuit also includes a front-stage DC / DC circuit drive circuit and a DC / AC circuit drive circuit, the first digital-to-analog converter is electrically connected to the microcontroller, the threshold control circuit is electrically connected to the first digital-to-analog converter, the front-stage DC / DC circuit drive circuit is electrically connected to the threshold control circuit, the front-stage DC / DC circuit drive circuit is electrically connected to the front-stage DC / DC circuit, the front-stage DC / DC circuit is electrically connected to the threshold control circuit, and the DC / AC drive circuit is electrically connected to the DC / AC circuit and the logic gate array.

5. The radio frequency ablation power supply system according to claim 3, characterized in that: The main auxiliary DC / DC circuit also includes a second digital-to-analog converter and a power over-limit detection module, the microcontroller is electrically connected to the second digital-to-analog converter, the power over-limit detection module is electrically connected to the second digital-to-analog converter, and the logic gate array is electrically connected to the power over-limit detection module.

6. A radio frequency ablation power supply system according to claim 5, characterized in that: The main auxiliary DC / DC circuit also includes a front-stage detection circuit, which is electrically connected to the front-stage DC / DC circuit, the microcontroller and the logic gate array.

7. The radio frequency ablation power supply system according to claim 3, characterized in that: The main auxiliary DC / DC circuit also includes an auxiliary circuit state detection module, and the auxiliary circuit state detection module is electrically connected to the microcontroller and the logic gate array.

8. The radio frequency ablation power supply system according to claim 3, characterized in that: The main auxiliary DC / DC circuit also includes a post-stage detection circuit, and the post-stage detection circuit is electrically connected to the filter circuit and the logic gate array.

9. The radio frequency ablation power supply system according to claim 3, characterized in that: A temperature sensor is arranged in the radio frequency electrode, and the temperature sensor is electrically connected to the microcontroller.

10. A control method for a radiofrequency ablation power system, characterized in that: A radio frequency ablation power supply system as described in any one of claims 1 to 9, comprising the following steps: converting AC power into DC power through an AC / DC circuit and transmitting it to the preceding DC / DC circuit, the control circuit feedback-adjusting the output voltage of the preceding DC / DC circuit, the DC / AC circuit converting the DC voltage of the preceding DC / DC circuit into AC voltage, outputting radio frequency power to a filter circuit, and then outputting it through radio frequency electrodes.

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