CN114047379A - Impedance power calibration device and method - Google Patents
Impedance power calibration device and method Download PDFInfo
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- CN114047379A CN114047379A CN202111421151.0A CN202111421151A CN114047379A CN 114047379 A CN114047379 A CN 114047379A CN 202111421151 A CN202111421151 A CN 202111421151A CN 114047379 A CN114047379 A CN 114047379A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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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
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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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
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
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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
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00589—Coagulation
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Abstract
The invention discloses an impedance power calibration device and a method, wherein the impedance power calibration device comprises a radio frequency source, a controller, a computer, an interaction module, a standard impedance module and a high-frequency electrotome tester, wherein the computer is respectively and electrically connected with a computer connecting end and the interaction module of the controller, and a controller connecting end of the radio frequency source is connected with a radio frequency source connecting end of the controller; the radio frequency source is connected with the standard impedance module, the power acquisition 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. The impedance power calibration method is used for performing power calibration by using the impedance power calibration device, and calculating and fitting a power relation function, so that the finally obtained power relation function is closer to the requirement of actual application working conditions, and the calibration accuracy is improved.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to an impedance power calibration device and method.
Background
The radiofrequency ablation technology converts alternating current acting on tumor tissues into heat energy of the tissues, and the purpose of curing tumors is achieved by increasing the temperature of the tumor tissues to generate coagulative necrosis. Because of its characteristics of minimal invasion and high efficiency, it has been widely used in tumor treatment of tissues or organs such as liver, kidney, mammary gland and thyroid gland. In recent years, with the development of imaging technology, there has been great development and progress in radio frequency ablation technology under the guidance of CT, ultrasound, and the like. The introduction of computer technology enables treatment parameters in the radio frequency ablation treatment process to be better controlled.
At present, the control mode of the radio frequency therapeutic machine applied in clinical medicine mainly comprises two control modes of 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 local tissues in the treatment process; the temperature control mode is to automatically adjust the radio frequency power output by monitoring the temperature of the local tissue to control the local temperature of the target tissue to be within the target temperature range.
The existing radio frequency therapy machine has the clinical effect that tumors smaller than 3cm can be inactivated at one time, and tumors of 3-5 cm cannot be cured at one time, and mainly shows cancer focus residue and recurrence. Through analysis and research on in-vitro pig liver experiments and physical characteristics of radio frequency ablation, the near-end tissue impedance of the needle is high, the far-end tissue impedance is low, and the near-end power is high and the far-end power is low in the ablation process, so that the near end is easy to dehydrate, coke and carbonize, and the ablation range is small; in order to enlarge the ablation range, the residual rate of the cancer focus is reduced.
Disclosure of Invention
The first objective of the present invention is to provide an impedance power calibration device, which can calibrate the rf power output by the rf therapy apparatus, and ensure the therapeutic effect. The first purpose of the invention is realized by the following technical scheme:
an impedance power calibration device comprises a radio frequency source, a controller, a computer and an interaction module, wherein the computer is respectively and electrically connected with a computer connecting end and the interaction module of the controller; the method is characterized in that: the radio frequency source is connected with the standard impedance module, the power acquisition 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.
In the technical scheme, the radio frequency power output by the radio frequency source applied to the radio frequency therapy apparatus is collected by adopting a standard impedance module and a high-frequency electrotome tester, and a power relation function of radio frequency voltage, impedance and the radio frequency source power is calculated. When the power relation function is applied in use, the output power set on the computer can be close to the actual power finally applied to the treatment part, and the treatment effect is ensured.
As a further improvement of the present invention, the standard impedance module further includes an impedance setting terminal, and the impedance setting terminal is connected to the impedance control terminal of the controller.
As a further improvement of the invention, the controller connecting end of the radio frequency source comprises a power supply interface, a DA control interface, a start-stop interface, a radio frequency voltage acquisition interface and a radio frequency current acquisition interface.
As a further improvement of the present invention, the controller connection end of the rf source further includes a signal selection interface, and the signal selection interface selects the rf voltage acquisition interface or the rf current acquisition interface to operate.
As a further improvement of the invention, the controller further comprises an interface module, wherein the interface module is provided with a signal integration end, a control signal output end and a feedback signal input end, and an integration interface connecting end of the controller is connected with the signal integration end.
As a further improvement of the present invention, the controller connection end of the rf source is connected to the control signal output end and the feedback signal input end of the interface module.
As a further improvement of the present invention, the interface module further includes a power signal input terminal, and the power signal input terminal is connected to the signal output terminal of the high-frequency electrotome tester.
The impedance power calibration device can change the impedance test value of the standard impedance module through the computer, achieve the aim of automatically calibrating the output power of the radio frequency source by a plurality of test values, form a more accurate power relation function and improve the calibration effect.
A second objective of the present invention is to provide an impedance power calibration method, which can calculate a power relation function to calibrate the output power of the rf therapeutic machine. The second purpose of the invention is realized by the following technical scheme:
an impedance power calibration method, characterized by: the impedance power calibration device adopting the foregoing method comprises the following steps:
(1) setting an impedance test range, an impedance test step length and an initial impedance test value;
(2) setting a test voltage range, a voltage test step length and an initial voltage test value;
(3) carrying out power data acquisition;
(4) increasing or decreasing the test voltage step length on the current voltage test value, and setting the voltage step length as the next voltage test value;
(5) circularly executing the step (3) and the step (4) until the voltage test value traverses the test voltage range by the voltage test step length;
(6) increasing or decreasing the test impedance step length on the current impedance test value, and setting the test impedance step length as the next impedance test value;
(7) circularly executing the step (2) to the step (6) until the impedance test value traverses the test impedance range by the impedance test step;
(8) calculating a power relation function of radio frequency voltage, impedance and radio frequency source power;
(9) and correspondingly storing the power relation function and the number of the corresponding radio frequency source.
In the technical scheme, the impedance power calibration device is used for power calibration, a plurality of groups of impedance test values and voltage test values are used for testing, and a power relation function is finally calculated and fitted, so that the finally obtained power relation function is closer to the requirement of practical application working conditions, and the calibration accuracy is improved.
As a further improvement of the present invention, the present invention further includes an impedance calibration method, which calibrates the set impedance test value after setting the impedance test value of the standard impedance module, and includes the following steps:
(1) setting an impedance test reference voltage;
(2) outputting voltage according to the set impedance test reference voltage;
(3) collecting radio frequency voltage and radio frequency current;
(4) and calculating an impedance relation function of the impedance test value, the radio frequency voltage and the radio frequency current.
(5) And correspondingly storing the impedance relation function and the number of the corresponding radio frequency source.
As a further improvement of the invention, the invention further comprises a precision calibration method, wherein the precision calibration method comprises an impedance precision calibration method and a power precision calibration method, and the impedance precision calibration method compares the acquired radio frequency voltage and radio frequency current with a set impedance test value after calculation to perform impedance precision calibration; the power precision calibration method is used for comparing a set power test value with power data collected by a high-frequency electrotome tester to perform power precision calibration.
The impedance power calibration method is used for power calibration by applying the impedance power calibration device, and process parameters in each power calibration method are calibrated and verified by setting an impedance calibration method, an impedance precision verification method and a power precision verification method, so that the calibration precision and effect are improved.
Drawings
Fig. 1 is a connection diagram of an impedance calibration apparatus according to an embodiment of the present invention.
Fig. 2 is a flowchart of an impedance power calibration method according to a second embodiment of the present invention.
Fig. 3 is a flowchart of an impedance power calibration method according to a third embodiment of the present invention.
Fig. 4 is a flowchart of an impedance power calibration method according to a fourth embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be further described with reference to the accompanying drawings, wherein for the purpose of facilitating explanation, the upper, lower, left, right, front, rear, etc. orientations may be defined in the application, and the definitions are intended to facilitate clear description of the relative positions of the structures, and are not intended to limit the actual orientations of the products during the manufacturing, use, sale, etc. The following further describes embodiments of the present invention with reference to the accompanying drawings:
example one
Referring to fig. 1, the present embodiment provides an impedance calibration apparatus, which includes a controller, a computer, an interaction module, an interface module, a radio frequency source, a standard impedance module, and a high-frequency knife tester.
And the computer is respectively and electrically connected with the computer connecting end of the controller and the interaction module. The radio frequency source is provided with a controller connecting end, and the controller connecting end comprises a power supply interface, a DA control interface, a start-stop interface, a signal selection interface, a radio frequency voltage acquisition interface and a radio frequency current acquisition interface.
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 connection end of the controller is connected with the signal integration end of the interface module. One acquisition signal input end of the interface module is connected with the radio frequency voltage acquisition interface and the radio frequency current acquisition interface of the radio frequency source, and the other acquisition signal input end of the interface module is connected with the signal output end of the high-frequency electrotome tester; in the embodiment, the controller is provided with only one analog-to-digital converter, so that the signal selection interface selects radio-frequency voltage or radio-frequency current as collected data, and when the controller is provided with two analog-to-digital converters, the signal selection interface is not provided, the radio frequency voltage acquisition interface and the radio frequency current acquisition interface are respectively connected to the two analog-to-digital converters through two acquisition signal input ends). And the power acquisition end of the high-frequency electrotome tester is connected with the power output end of the standard impedance module.
And the computer transmits a control signal to the controller and receives the acquired data transmitted by 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, and provides power for the radio frequency source and the standard impedance module through the power supply interface; providing a voltage test value to the radio frequency source through the DA control interface; controlling the starting and stopping of the impedance test through the start-stop interface; selecting a selected radio frequency voltage or radio frequency current as acquired data through the signal selection interface; and providing an impedance test value 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 acquisition interface and the radio frequency current acquisition interface and the interface module. And the signal output end of the high-frequency electrotome tester transmits the acquired power data to the controller through the interface module.
Example two
Referring to fig. 2, the present embodiment provides an impedance power calibration method, which is characterized in that: the impedance power calibration device provided by the first embodiment comprises the following steps:
(1) the computer transmits an impedance test range of 10-500 omega and an impedance test step length of 1 omega to the controller, and the controller sets an initial impedance test value R of the standard impedance module to 10 omega;
(2) the computer transmits a test voltage range of 0.1V-10V and a voltage test step length of 0.1V to the controller, and the controller sets an initial voltage test value DAV of the radio frequency source to be 0.1V;
(3) the high-frequency electrotome tester acquires power data to obtain radio frequency source power P, records the acquired radio frequency source power P and transmits the radio frequency source power P to the computer through the controller;
(4) the controller increases the step length of the test voltage on the current voltage test value DAV and sets the test voltage step length as the next voltage test value DAV for the radio frequency source;
(5) circularly executing the step (3) to the step (4) 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 by the voltage test step length);
(6) the controller increases the test impedance step length on the current impedance test value R and sets the standard impedance module as the next impedance test value R;
(7) circularly executing the step (2) to the step (6) until the impedance test value R reaches the upper limit value 500 omega of the impedance test range (the impedance test value traverses the test impedance range by the impedance test step size);
(8) calculating and fitting a power relation function DAV (f) (R, P) of a voltage test value DAV, an impedance R and radio frequency source power P by using a least square method;
(9) and correspondingly storing the power relation function and the corresponding radio frequency source number to a data server.
EXAMPLE III
Referring to fig. 3, the present embodiment provides an impedance power calibration method, based on the impedance power calibration method provided in the second embodiment, after the impedance test value R is set in the step (1) and the step (6), the method calibrates the set impedance test value R, and includes the following steps:
(1) the controller sets the impedance test reference voltage to be 1V;
(2) starting the radio frequency source, and outputting voltage to the radio frequency source by the controller according to the set impedance test reference voltage;
(3) the controller collects radio frequency voltage ADV and radio frequency current ADI output by the radio frequency source;
(4) and calculating and fitting an impedance relation function R (f) (ADV, ADI) of the impedance test value R, the radio-frequency voltage ADV and the radio-frequency current ADI by using a least square method.
(5) And correspondingly storing the impedance relation function and the corresponding radio frequency source number to a data server.
Example four
Referring to fig. 4, the present embodiment provides an impedance power calibration method, which further includes an accuracy verification method based on the impedance power calibration method provided in the third embodiment, where the accuracy verification method includes an impedance accuracy verification method and a power accuracy verification method.
The impedance precision calibration method comprises the following steps:
(1) the computer transmits an impedance test range of 10-500 omega and an impedance test step length of 10 omega to the controller, and the controller sets an initial impedance test value R of the standard impedance module to 10 omega;
(2) the controller collects radio frequency voltage ADV and radio frequency current ADI output by the radio frequency source;
(3) resistance verification is carried out by using ohm law R' ═ ADV/ADI;
(4) if the absolute value of the difference between R and R' is less than or equal to 1 omega, the impedance precision is checked to be qualified, otherwise, the impedance precision is checked to be unqualified, and the impedance relation function needs to be recalibrated;
(5) and (5) circularly executing the step (2) to the step (4) until the impedance test value R reaches the upper limit value 500 omega of the impedance test range.
The impedance precision calibration method comprises the following steps:
(1) the computer transmits a test power range of 10W-200W and a power test step length of 10W to the controller, and the controller sets an initial power test value P' of the radio frequency source to 10W;
(2) the high-frequency electrotome tester collects power data P;
(3) if the absolute value of the difference between P and P' is less than or equal to 1W, the power precision is checked to be qualified, otherwise, the power relation function needs to be recalibrated if the power precision is checked to be unqualified;
(4) and (4) circularly executing the step (2) and the step (3) until the power test value P' reaches the upper limit value 200W of the impedance test range.
The above embodiments are merely for full disclosure and not for limitation, and any replacement of equivalent technical features, which can be obtained without inventive work based on the gist of the present invention, should be construed as the scope of the present disclosure.
Claims (10)
1. An impedance power calibration device comprises a radio frequency source, a controller, a computer and an interaction module, wherein the computer is respectively and electrically connected with a computer connecting end and the interaction module of the controller; the method is characterized in that: the radio frequency source is connected with the standard impedance module, the power acquisition 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.
2. The impedance power calibration device of claim 1, wherein: the standard impedance module further comprises an impedance setting end, and the impedance setting end is connected with an impedance control end of the controller.
3. The impedance power calibration device of claim 1, wherein: the controller connecting end of the radio frequency source comprises a power supply interface, a DA control interface, a start-stop interface, a radio frequency voltage acquisition interface and a radio frequency current acquisition interface.
4. The impedance power calibration device of claim 3, wherein: the controller connecting end of the radio frequency source further comprises a signal selection interface, and the signal selection interface selects a radio frequency voltage acquisition interface or a radio frequency current acquisition interface to work.
5. The impedance power calibration device of claim 1, wherein: the controller is characterized by further comprising an interface module, wherein a signal integration end, a control signal output end and a feedback signal input end are arranged on the interface module, and the signal integration end is connected with the integration interface connecting end of the controller.
6. The impedance power calibration device of claim 5, wherein: and the controller connecting 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 device 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. An impedance power calibration method, characterized by: the impedance power calibration apparatus of any one of claims 1 to 7, comprising the steps of:
(1) setting an impedance test range, an impedance test step length and an initial impedance test value;
(2) setting a test voltage range, a voltage test step length and an initial voltage test value;
(3) carrying out power data acquisition;
(4) increasing or decreasing the test voltage step length on the current voltage test value, and setting the voltage step length as the next voltage test value;
(5) circularly executing the step (3) and the step (4) until the voltage test value traverses the test voltage range by the voltage test step length;
(6) increasing or decreasing the test impedance step length on the current impedance test value, and setting the test impedance step length as the next impedance test value;
(7) circularly executing the step (2) to the step (6) until the impedance test value traverses the test impedance range by the impedance test step;
(8) calculating a power relation function of radio frequency voltage, impedance and radio frequency source power;
(9) and correspondingly storing the power relation function and the number of the corresponding radio frequency source.
9. The impedance power calibration method of claim 8, wherein: the method also comprises an impedance calibration method, after the impedance test value of the standard impedance module is set, the set impedance test value is calibrated, and the method comprises the following steps:
(1) setting an impedance test reference voltage;
(2) outputting voltage according to the set impedance test reference voltage;
(3) collecting radio frequency voltage and radio frequency current;
(4) and calculating an impedance relation function of the impedance test value, the radio frequency voltage and the radio frequency current.
(5) And correspondingly storing the impedance relation function and the number of the corresponding radio frequency source.
10. The impedance power calibration method according to claim 8 or 9, wherein: the impedance precision calibration method is used for comparing the acquired radio frequency voltage and radio frequency current after calculation with a set impedance test value to carry out impedance precision calibration; the power precision calibration method is used for comparing a set power test value with power data collected by a high-frequency electrotome tester to perform power precision calibration.
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| CN202111421151.0A CN114047379A (en) | 2021-11-26 | 2021-11-26 | Impedance power calibration device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114778995A (en) * | 2022-06-22 | 2022-07-22 | 南京亿高微波系统工程有限公司 | High-frequency electrotome precision automatic measurement method and device |
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2021
- 2021-11-26 CN CN202111421151.0A patent/CN114047379A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114778995A (en) * | 2022-06-22 | 2022-07-22 | 南京亿高微波系统工程有限公司 | High-frequency electrotome precision automatic measurement method and device |
| CN114778995B (en) * | 2022-06-22 | 2022-09-06 | 南京亿高微波系统工程有限公司 | High-frequency electrotome precision automatic measurement method and device |
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