Impedance power calibration apparatus and method

Abstract

The application discloses an impedance power calibration device and method, the impedance power calibration device includes radio frequency source, controller, computer, interactive module, standard impedance module and high frequency electrotome tester, the computer is connected with the computer connection end of the controller and the interactive module electricity respectively, the controller connection end of the radio frequency source connects the radio frequency source connection end of the controller;The radio frequency source connects the standard impedance module, the power output end of the standard impedance module is connected with the power acquisition end of the high frequency electrotome tester, and the signal output end of the high frequency electrotome tester is connected with the power input end of the controller.The impedance power calibration method is applied to the impedance power calibration device to carry out power calibration, calculates and fits out power relation function, so that the finally obtained power relation function is more close to the actual application working condition requirement, so as to improve the calibration accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to an impedance power calibration device and method. BACKGROUND

[0002] Radio frequency ablation technology is to convert the alternating current acting on the tumor tissue into thermal energy of the tissue, and to make the tumor tissue produce coagulative necrosis by raising the temperature of the tumor tissue, so as to achieve the purpose of curing the tumor. Because of its characteristics of minimally invasive and high efficiency, it has been widely used in the treatment of tumors of human liver, kidney, breast, thyroid and other tissues or organs. In recent years, with the development of imaging technology, radio frequency ablation technology under the guidance of CT, ultrasound and other technologies has made great progress. The introduction of computer technology has also made the treatment parameters in the radio frequency ablation treatment process better controlled.

[0003] At present, the control modes of radio frequency treatment machines used in clinical medicine mainly include power control and temperature control. The power control mode adopts fixed power output, and controls the radio frequency energy output by monitoring the impedance change of the local tissue during the treatment process; the temperature control mode automatically adjusts the radio frequency power output by monitoring the temperature of the local tissue, and controls the local temperature of the target tissue to make the temperature within the target temperature range.

[0004] The existing radio frequency treatment machine has a clinical effect that tumors less than 3cm can be inactivated at one time, but tumors of 3-5cm cannot be cured at one time, mainly manifested as cancer residue and recurrence. Through analysis and research on the ex vivo pig liver experiment and the physical characteristics of radio frequency ablation, it is found that the impedance of the near-end tissue is high and the impedance of the far-end tissue is low, and in the ablation process, the near-end power is large and the far-end power is small, so that the near-end is easy to dehydrate, carbonize and carbonize, and the ablation range is small; in order to expand the ablation range and reduce the cancer residue rate. SUMMARY

[0005] The first purpose of the present application is to provide an impedance power calibration device which can calibrate the radio frequency power output by the radio frequency treatment machine and ensure the treatment effect. The first purpose of the present application is realized by the following technical scheme:

[0006] An impedance power calibration device, comprising a radio frequency source, a controller, a computer and an interactive module, the computer is electrically connected with the computer connection end of the controller and the interactive module, the controller connection end of the radio frequency source is connected with the radio frequency source connection end of the controller; characterized in that: it further comprises a standard impedance module and a high-frequency electrotome tester, the radio frequency source is connected with the standard impedance module, the power collection end of the high-frequency electrotome tester is connected with the power output end of the standard impedance module, and the signal output end of the high-frequency electrotome tester is connected with the power input end of the controller.

[0007] In the technical solution, the standard impedance module and the high-frequency electrotome tester are used to collect the radio frequency power output by the radio frequency source applied to the radio frequency treatment machine, and the power relationship function of the radio frequency voltage, impedance and radio frequency source power is calculated.

[0008] As a further improvement of the present application, the standard impedance module further comprises an impedance setting end connected to the impedance control end of the controller.

[0009] As a further improvement of the present application, the controller connection end of the radio frequency source comprises a power supply interface, a DA control interface, a start-stop interface, a radio frequency voltage collection interface and a radio frequency current collection interface.

[0010] As a further improvement of the present application, the controller connection end of the radio frequency source further comprises a signal selection interface for selecting the radio frequency voltage collection interface or the radio frequency current collection interface to work.

[0011] As a further improvement of the present application, an interface module is further provided, which is provided with a signal integration end, a control signal output end and a feedback signal input end, and the integration interface connection end of the controller is connected to the signal integration end.

[0012] As a further improvement of the present application, the controller connection end of the radio frequency source is connected to the control signal output end and the feedback signal input end of the interface module.

[0013] As a further improvement of the present application, the interface module further comprises a power signal input end connected to the signal output end of the high-frequency electrotome tester.

[0014] The impedance power calibration device can change the impedance test value of the standard impedance module through the computer, so as to automatically calibrate the output power of the radio frequency source with multiple test values, form a more accurate power relationship function and improve the calibration effect.

[0015] The second object of the present application aims to provide an impedance power calibration method capable of calculating the power relationship function to calibrate the output power of the radio frequency treatment machine.

[0016] An impedance power calibration method, characterized in that the impedance power calibration device described above is used, comprising the following steps:

[0017] (1) setting the impedance test range, the impedance test step and the initial impedance test value;

[0018] (2) set the test voltage range, voltage test step and initial voltage test value;

[0019] (3) perform power data collection;

[0020] (4) increase or decrease the test voltage step at the current voltage test value and set the next voltage test value;

[0021] (5) cyclically execute steps (3) and (4) until the voltage test value traverses the test voltage range by the voltage test step;

[0022] (6) increase or decrease the test impedance step at the current impedance test value and set the next impedance test value;

[0023] (7) cyclically execute steps (2)-(6) until the impedance test value traverses the test impedance range by the impedance test step;

[0024] (8) calculate the power relationship function of the radio frequency voltage, impedance and radio frequency source power;

[0025] (9) correspondingly save the power relationship function and the number of the corresponding radio frequency source.

[0026] In the technical solution, the impedance power calibration device is used for power calibration, a plurality of impedance test values and voltage test values are used for testing, a power relationship function is finally calculated and fitted, the finally obtained power relationship function is closer to the actual application working condition requirement, and the calibration accuracy is improved.

[0027] As a further improvement of the application, the impedance calibration method further comprises the following steps after setting the impedance test value of the standard impedance module:

[0028] (1) set an impedance test reference voltage;

[0029] (2) output a voltage according to the set impedance test reference voltage;

[0030] (3) collect radio frequency voltage and radio frequency current;

[0031] (4) calculate the impedance relationship function of the impedance test value, radio frequency voltage and radio frequency current.

[0032] (5) correspondingly save the impedance relationship function and the number of the corresponding radio frequency source.

[0033] As a further improvement of the present application, the precision verification method further comprises an impedance precision verification method and a power precision verification method, the impedance precision verification method compares the calculated radio frequency voltage and radio frequency current with the set impedance test value for impedance precision verification; the power precision verification method compares the set power test value with the power data collected by the high-frequency electrotome tester for power precision verification.

[0034] The impedance power calibration method applies the impedance power calibration device to perform power calibration, and calibrates and verifies the process parameters in each power calibration method by setting the impedance calibration method, the impedance precision verification method and the power precision verification method, so as to improve the calibration precision and effect. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The connection schematic diagram of the impedance calibration device provided in the first embodiment of the present application.

[0036] Figure 2 The flowchart of the impedance power calibration method provided in the second embodiment of the present application.

[0037] Figure 3 The flowchart of the impedance power calibration method provided in the third embodiment of the present application.

[0038] Figure 4 The flowchart of the impedance power calibration method provided in the fourth embodiment of the present application. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be further described below in combination with the drawings. In order to facilitate description, the directions such as up, down, left, right, front and back may be defined in the present application, which aims to facilitate the description of the relative position relationship of the structure, and is not used to limit the actual direction in the production, use, sale and other processes. The specific embodiments of the present application will be further described below in combination with the drawings:

[0040] Embodiment one

[0041] Please refer to Figure 1 The present embodiment provides an impedance calibration device, which comprises a controller, a computer, an interactive module, an interface module, a radio frequency source, a standard impedance module and a high-frequency electrotome tester.

[0042] The computer is electrically connected with the computer connection end and the interactive module of the controller. The radio frequency source is provided with a controller connection end, and the controller connection end comprises a power supply interface, a DA control interface, a start-stop interface, a signal selection interface, a radio frequency voltage collection interface and a radio frequency current collection interface.

[0043] The interface module is provided with a signal integration end, a control signal output end and a collection signal input end, and the integration interface connecting end of the controller is connected to the signal integration end of the interface module. One collection signal input end of the interface module is connected to the radio frequency voltage collection interface and the radio frequency current collection interface of the radio frequency source, and the other collection signal input end of the interface module is connected to the signal output end of the high-frequency electrotome tester; the control signal output end of the interface module is connected to the power supply interface, the DA control interface, the start-stop interface, the signal selection interface of the radio frequency source and the impedance setting end of the standard impedance module (as another possible technical solution, the interface module can not be included, the controller connecting end of the radio frequency source is connected to the radio frequency source connecting end of the controller, the signal output end of the high-frequency electrotome tester is connected to the power input end of the controller, and the impedance setting end of the standard impedance module is connected to the impedance control end of the controller; in this embodiment, since only one analog-to-digital converter is provided on the controller, the signal selection interface is provided to select radio frequency voltage or radio frequency current as the collected data, and when two analog-to-digital converters are provided on the controller, the signal selection interface can not be provided, and the radio frequency voltage collection interface and the radio frequency current collection interface are connected to the two analog-to-digital converters through the two collection signal input ends). The power collection end of the high-frequency electrotome tester is connected to the power output end of the standard impedance module.

[0044] The computer transmits control signals to the controller and receives collected data from the controller for analysis and processing. The controller transmits control signals to the radio frequency source and the standard impedance module through the interface module, provides power to the radio frequency source and the standard impedance module through the power supply interface, provides voltage test values to the radio frequency source through the DA control interface, controls the start and stop of impedance testing through the start-stop interface, selects radio frequency voltage or radio frequency current as collected data through the signal selection interface, and provides impedance test values to the standard impedance module. The radio frequency source transmits radio frequency voltage data and radio frequency current data to the controller through the radio frequency voltage collection interface and the radio frequency current collection interface via the interface module. The signal output end of the high-frequency electrotome tester transmits collected power data to the controller through the interface module.

[0045] Embodiment two

[0046] Please refer to Figure 2 The embodiment provides an impedance power calibration method, characterized by: using the impedance power calibration device provided in embodiment one, comprising the following steps:

[0047] (1) the computer transmits to the controller that the impedance test range is 10Ω-500Ω and the impedance test step is 1Ω, and the controller sets the initial impedance test value R of the standard impedance module to 10Ω;

[0048] (2) the computer transmits to the controller that the test voltage range is 0.1V-10V and the voltage test step is 0.1V, and the controller sets the initial voltage test value DAV of the radio frequency source to 0.1V;

[0049] (3) the high-frequency electrotome tester collects power data to obtain the radio frequency source power P, records the collected radio frequency source power P and transmits it to the computer through the controller;

[0050] (4) the controller increases the test voltage step on the voltage test value DAV of this time and sets it to the voltage test value DAV of the next time for the radio frequency source;

[0051] (5) steps (3)-(4) are executed cyclically until the voltage test value DAV reaches the upper limit value 10V of the voltage test range (the voltage test value traverses the test voltage range with the voltage test step);

[0052] (6) the controller increases the test impedance step on the impedance test value R of this time and sets it to the impedance test value R of the next time for the standard impedance module;

[0053] (7) steps (2)-(6) are executed cyclically until the impedance test value R reaches the upper limit value 500Ω of the impedance test range (the impedance test value traverses the test impedance range with the impedance test step);

[0054] (8) the least square method is used to calculate the power relationship function DAV=f(R,P) of the voltage test value DAV, the impedance R and the radio frequency source power P;

[0055] (9) the power relationship function and the corresponding radio frequency source number are saved to the data server.

[0056] Embodiment Three

[0057] Please refer to Figure 3 , the embodiment provides an impedance power calibration method, which is based on the impedance power calibration method provided in embodiment two, and after setting the impedance test value R in steps (1) and (6), the set impedance test value R is calibrated, including the following steps:

[0058] (1) the controller sets the impedance test reference voltage to 1V;

[0059] (2) the controller outputs a voltage to the radio frequency source according to a set impedance test reference voltage;

[0060] (3) the controller collects radio frequency voltage ADV and radio frequency current ADI output by the radio frequency source;

[0061] (4) the least square method is used to calculate an impedance relationship function R=f(ADV, ADI) of impedance test value R and radio frequency voltage ADV and radio frequency current ADI.

[0062] (5) the impedance relationship function and corresponding radio frequency source number are saved to a data server.

[0063] Embodiment four

[0064] Please refer to Figure 4 , the embodiment provides an impedance power calibration method, which is based on the impedance power calibration method provided in embodiment three and further comprises an accuracy checking method, the accuracy checking method comprises an impedance accuracy checking method and a power accuracy checking method.

[0065] The impedance accuracy checking method comprises:

[0066] (1) the computer transmits an impedance test range of 10Ω-500Ω and an impedance test step of 10Ω to the controller, and the controller sets an initial impedance test value R of a standard impedance module to 10Ω;

[0067] (2) the controller collects radio frequency voltage ADV and radio frequency current ADI output by the radio frequency source;

[0068] (3) resistance checking is performed by using Ohm's law R'=ADV / ADI;

[0069] (4) if the absolute value of the difference between R and R' is less than or equal to 1Ω, the impedance accuracy checking is qualified, otherwise, the impedance accuracy checking is unqualified, and the impedance relationship function needs to be recalibrated;

[0070] (5) steps (2)-(4) are circularly executed until the impedance test value R reaches the upper limit value 500Ω of the impedance test range.

[0071] The impedance accuracy checking method comprises:

[0072] (1) the computer transmits a test power range of 10W-200W and a power test step of 10W to the controller, and the controller sets an initial power test value P' of the radio frequency source to 10W;

[0073] (2) the high-frequency electrotome tester collects power data P;

[0074] (3) If the absolute value of the difference between P and P' is less than or equal to 1 W, the power accuracy check is qualified, otherwise, the power accuracy check is not qualified, and the power relationship function needs to be recalibrated;

[0075] (4) Steps (2) and (3) are executed in a loop until the power test value P' reaches the upper limit value 200 W of the impedance test range.

[0076] The above embodiments are only for full disclosure and not for limiting the present application, and any replacement of equivalent technical features based on the inventive concept and without creative labor should be considered as the scope disclosed by the present application.

Claims

1. An impedance power calibration method, using an impedance power calibration device for calibration, characterized by: The impedance power calibration device comprises a radio frequency source, a controller, a computer and an interaction module, the computer is electrically connected with the computer connection end of the controller and the interaction module respectively, the controller connection end of the radio frequency source is connected with the radio frequency source connection end of the controller; further comprising a standard impedance module and a high-frequency electrotome tester, the radio frequency source is connected with the standard impedance module, the power output end of the standard impedance module is connected with the power collection end of the high-frequency electrotome tester, and the signal output end of the high-frequency electrotome tester is connected with the power input end of the controller; The controller is used for setting the impedance test value of the standard impedance module and the voltage test value of the radio frequency source, the standard impedance module changes the impedance test value under the control of the controller according to the instruction of the computer, and the radio frequency source transmits radio frequency voltage data and radio frequency current data to the controller through the collection interface; The high-frequency electrotome tester is used for collecting the power data of the radio frequency source and transmitting the obtained radio frequency source power to the computer through the controller; The computer is used for transmitting control signals to the controller and receiving the collection data transmitted by the controller, and forming a power relationship function according to the voltage test value, the impedance test value and the radio frequency source power; The impedance power calibration method comprises the following steps: (1) setting the impedance test range, the impedance test step and the initial impedance test value; (2) setting the test voltage range, the voltage test step and the initial voltage test value; (3) collecting power data; (4) increasing or decreasing the voltage test step on the voltage test value of this time to set the voltage test value of next time; (5) cyclically executing step (3) and step (4) until the voltage test value traverses the test voltage range with the voltage test step; (6) increasing or decreasing the impedance test step on the impedance test value of this time to set the impedance test value of next time; (7) cyclically executing step (2) to step (6) until the impedance test value traverses the impedance test range with the impedance test step; (8) calculating the power relationship function of the radio frequency voltage, the impedance and the radio frequency source power; (9) corresponding to save the power relationship function and the corresponding number of the radio frequency source.

2. The impedance power calibration method of claim 1, wherein: The standard impedance module further comprises an impedance setting end, and the impedance setting end is connected with the impedance control end of the controller.

3. The impedance power calibration method of claim 1, wherein: The controller connection end of the radio frequency source comprises a power supply interface, a DA control interface, a start-stop interface, a radio frequency voltage collection interface and a radio frequency current collection interface.

4. The impedance power calibration method of claim 3, wherein: The controller connection end of the radio frequency source further comprises a signal selection interface, which selects the radio frequency voltage collection interface or the radio frequency current collection interface to work.

5. The impedance power calibration method of claim 1, wherein: Further comprising an interface module, the interface module is provided with a signal integration end, a control signal output end and a feedback signal input end, and the signal integration end is connected with the integration interface connection end of the controller.

6. The impedance power calibration method of claim 5, wherein: The controller connection end of the radio frequency source is connected with the control signal output end and the feedback signal input end of the interface module.

7. The impedance power calibration method of claim 5, wherein: The interface module further comprises a power signal input end, and the power signal input end is connected with the signal output end of the high-frequency electrotome tester.

8. The impedance power calibration method of claim 1, wherein: The impedance calibration method comprises the following steps: (1) setting an impedance test reference voltage; (2) outputting a voltage according to the set impedance test reference voltage; (3) collecting radio frequency voltage and radio frequency current; (4) calculating an impedance relationship function of the impedance test value, the radio frequency voltage and the radio frequency current; (5) saving the impedance relationship function and the corresponding radio frequency source number.

9. The impedance power calibration method of claim 8, wherein: The precision checking method comprises an impedance precision checking method and a power precision checking method. The impedance precision checking method compares the calculated radio frequency voltage and radio frequency current with the set impedance test value for impedance precision checking. The power precision checking method compares the set power test value with the power data collected by the high-frequency electrotome tester for power precision checking.

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