Method and device for controlling tissue temperature field through radio frequency power

Abstract

The invention relates to the technical field of medical instruments, in particular to a method and equipment for controlling a tissue temperature field through radio frequency power. The method comprises the steps that S1, radio frequency treatment equipment has a pre-output state, and the pre-output state is that radio frequency energy and a refrigerant are controlled to be output according to default numerical values; s2, the radio frequency treatment equipment further has a model control state, and the model control state is that radio frequency energy and a refrigerant are controlled through a default model, an adjusting model and a stable model; the default model is a preset temperature model; the adjusting model is detected through the detection mechanism, and radio frequency energy parameters are adjusted on the basis of the default model according to detection data; and the stable model combines the static state of the default model and the dynamic change of the adjustment model so as to judge whether the adjustment model is stable or not. According to the method, the radio frequency energy is accurately controlled, so that the temperature of the radio frequency energy acting on the target tissue layer is controllable, the change of the radio frequency energy corresponds to the change of a tissue subcutaneous temperature field, and the radio frequency energy output can achieve an ideal acting effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a method and device for controlling tissue temperature field with radio frequency power. Background Art

[0002] For the fields of medical beauty skin treatment, it is necessary to ensure that the temperature field of the target tissue is accurately controlled so that the temperature field changes according to the given radio frequency energy, thereby providing effective temperature guidance treatment for skin treatment, so that the subcutaneous tissue will not cause cell necrosis due to high temperature, and at the same time promote the decomposition and recombination of cells, so that the radio frequency energy output can achieve the ideal effect. Among them, the radio frequency system includes: radio frequency generator, handle assembly, treatment head, etc. Among them, the radio frequency generator system includes display assembly, control assembly, radio frequency power output assembly, and gas circuit assembly; the radio frequency generator internal multiple components control the radio frequency power to output radio frequency energy to the target tissue through the handle at the treatment head (non-invasively); the radio frequency generator internal multiple components control the gas circuit assembly to provide refrigerant to the treatment head through the handle to reduce the temperature of the electrode contact surface, thereby reducing the skin surface temperature; the temperature monitoring at the treatment head is transmitted back to the host, and different radio frequency energy output gears are adjusted through the display assembly, and the target tissue temperature achieves different temperature gradients.

[0003] The radio frequency system in the existing technology lacks relevant methods and equipment for accurately controlling radio frequency energy. The changes in radio frequency energy correspond to changes in the subcutaneous temperature field of the tissue and cannot be accurately controlled, which leads to the inability to accurately control the temperature of the target tissue layer when the radio frequency energy acts on it, affecting the skin treatment effect. Summary of the invention

[0004] The present invention provides a method and device for controlling tissue temperature field with radio frequency power. In order to solve the problem in the prior art that the change of radio frequency energy corresponds to the change of subcutaneous temperature field of tissue, which leads to the inability to accurately control the temperature of the target tissue layer when radio frequency energy acts on it, thus affecting the skin treatment effect. The technical solution of the present invention is: a method for controlling tissue temperature field with radio frequency power, comprising:

[0005] Step S1, when the radio frequency treatment device has a pre-output state, the pre-output state is: controlling the radio frequency energy and the refrigerant to be output at default values; wherein the radio frequency energy is pre-output at a low power value, and the refrigerant is pre-output at a small flow value;

[0006] Step S2, the radio frequency treatment device also has a model control state, and the model control state is: controlling the radio frequency energy and the refrigerant through the default model, the adjustment model and the stable model; wherein the default model is a preset temperature model, the radio frequency energy is output according to the preset gear, and the output of the refrigerant is temperature-controlled at a flow rate corresponding to the gear; wherein the adjustment model detects through a detection mechanism: the target tissue temperature, the impedance value and the radio frequency output parameters, and adjusts the radio frequency energy parameters on the basis of the default model according to the detection data; wherein the stable model combines the static state of the default model and the dynamic changes of the adjustment model, thereby judging whether the adjustment model is stable; and the stable model judges whether the energy output of the radio frequency generator is uniform through the temperature detection mechanism, so as to adjust the response time of the default model and the adjustment model in real time to prevent the overshoot effect of radio frequency energy and refrigerant.

[0007] Optionally, in the pre-output state, the low power value of the RF energy is: less than 0.5W, 100ms pulse width; and, in the pre-output state, the small flow value of the refrigerant is: 0.04ml, 4ms pulse width; and / or,

[0008] In the pre-output state, the radio frequency treatment device is temperature controlled so that the target tissue temperature is at 18 degrees to avoid frostbite and crystallization, thereby ensuring the treatment effect and helping to reduce the body's sense of pain.

[0009] Optionally, in step S2, the default model is a preset temperature model, the RF energy is output according to a preset gear, and the output of the refrigerant is temperature-controlled at 18 degrees at a flow rate corresponding to the gear.

[0010] Optionally, the default model is a temperature model summarized from repeated experiments; the radiofrequency treatment device has 16 gears; and the default model adjusts the amount of refrigerant in the following range through multiple gears: 0.04 ml, 4 ms pulse width, to 0.17 ml, 17 ms pulse width;

[0011] The corresponding rising temperature of the fat layer is: 0.5℃ to 7.5℃, and the temperature of the skin layer is controlled to be lower than the temperature of the fat layer in the range of: 0.5℃ to 1.5℃.

[0012] Optionally, in step S2, if the regulation model detects that the impedance value changes, the current, voltage and pulse width of the RF generator are adjusted within milliseconds to ensure constant energy output; at the same time, through multi-channel temperature monitoring, the refrigerant pulse width is adjusted in real time according to the temperature change relationship on the skin surface to control the constant flow output, so as to maintain the temperature rise relationship in the default model through the adjustable pulse width;

[0013] In the above process, if the output power of the radio frequency generator changes, then in the next stage of energy control, the radio frequency generator is set to a default constant power adjustment setting.

[0014] Optionally, in step S2, the stable model combines the static state of the default model and the dynamic changes of the adjustment model; wherein the proportional relationship is: stable model = A×adjustment model + B×default model, A and B are factors that change quickly over time, and the A and B values ​​are proportional to the adjustment time.

[0015] Optionally, in the initial preset normal state: A = B = 0.5;

[0016] In the calculation of the stability model: if the refrigerant and RF energy are much smaller than expected, A decreases and B increases; if the refrigerant and RF energy are much larger than expected, A increases and B decreases;

[0017] Among them, the expected values ​​of refrigerant and RF energy are: RF energy in 16 levels from 0.5 to 8 corresponds to 20J to 170J, and refrigerant in 16 levels from 0.5 to 8 corresponds to 0.12ml to 0.51ml. However, in the actual RF energy output, energy is adjusted in a closed loop with impedance, and parameters such as voltage, current, and pulse width are slightly adjusted, so the refrigerant needs to follow the micro-adjustment. The refrigerant adjusts its own change rate according to the change rate of RF energy within 1.2s, and determines a rapid change factor (i.e., A and B) according to the change rate of RF energy and the change rate of refrigerant over time. A and B are 0.5 at the beginning. Later, according to the change of the adjustment model, A and B will produce instantaneous oscillation changes, but will eventually return to the state of 0.5 for micro-adjustment, and there will be no significant changes until the single-shot energy is continuously output.

[0018] Optionally, in the radio frequency energy control of the radio frequency treatment device, in the pre-output state: a default low power value is output, and the radio frequency energy is output at a low power of less than 0.5W for 100ms;

[0019] In the RF energy control of the RF treatment device, during the working stage, power is output to the target tissue with a constant RF power; at the same time, the RF power parameters and loop impedance values ​​are monitored and adjusted, but the RF energy size is not adjusted, and the refrigerant control is not involved in the adjustment to ensure power stability.

[0020] Optionally, in the refrigerant control of the radio frequency treatment device, in the pre-output state: the refrigerant output is at a small flow rate with a pulse width of 4ms and a temperature control of 18 degrees to avoid frostbite and crystallization, thereby ensuring the treatment effect and helping to reduce the body's sense of pain;

[0021] In the refrigerant control of the radio frequency treatment device, during the working stage, when the radio frequency energy is output according to the energy of the preset gear, the output of the refrigerant is adjusted according to the parameters of the adjustment model; and the radio frequency treatment device monitors the stability of the output flow, continuous pulse width, pressure and multi-channel temperature monitoring to realize the regulation of the adjustment model;

[0022] Among them, the refrigerant adjustment does not participate in the adjustment of the radio frequency energy size, which is used to ensure the temperature model of the skin contact layer, and the stability of the radio frequency ensures the heating model of the subcutaneous tissue.

[0023] Optionally, in the refrigerant control of the radio frequency therapy device, during the working stage, during the 1.2s radio frequency output process, if the pressure is insufficient or the stability is insufficient, the radio frequency therapy device maintains a constant pressure of 6 bar through a liquid pump, and judges the stability again through a flow sensor, and then quickly controls the refrigerant pulse width, and monitors and adjusts the temperature rise within the total time according to the skin surface temperature regulation in the established model.

[0024] A radio frequency treatment device using a method of applying radio frequency power to control a tissue temperature field, comprising: a host, a handle and a treatment head;

[0025] The target tissue is provided with an electrode sheet for realizing impedance monitoring; the treatment head is also provided with a temperature sensor for realizing temperature acquisition.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. The method of controlling tissue temperature field by radio frequency power provided by the present invention comprises:

[0028] Step S1, when the radio frequency treatment device has a pre-output state, the pre-output state is: controlling the radio frequency energy and the refrigerant to be output at default values; wherein the radio frequency energy is pre-output at a low power value, and the refrigerant is pre-output at a small flow value;

[0029] Step S2, the radio frequency treatment device also has a model control state, and the model control state is: controlling the radio frequency energy and the refrigerant through the default model, the adjustment model and the stable model; wherein the default model is a preset temperature model, the radio frequency energy is output according to the preset gear, and the output of the refrigerant is temperature-controlled at a flow rate corresponding to the gear; wherein the adjustment model detects through a detection mechanism: the target tissue temperature, the impedance value and the radio frequency output parameters, and adjusts the radio frequency energy parameters on the basis of the default model according to the detection data; wherein the stable model combines the static state of the default model and the dynamic changes of the adjustment model, thereby judging whether the adjustment model is stable; and the stable model judges whether the energy output of the radio frequency generator is uniform through the temperature detection mechanism, so as to adjust the response time of the default model and the adjustment model in real time to prevent the overshoot effect of radio frequency energy and refrigerant.

[0030] In the present invention, the pre-output state of the above-mentioned radio frequency treatment equipment is used in conjunction with the default model, adjustment model and stable model to control radio frequency energy and refrigerant. It is possible to effectively and precisely control radio frequency energy so that the temperature of the target tissue layer acted upon by radio frequency energy can be controlled, and the change in radio frequency energy corresponds to the change in the subcutaneous temperature field of the tissue. The temperature field changes according to the given radio frequency energy, thereby providing effective temperature guidance treatment for skin treatment, preventing subcutaneous tissue from causing cell necrosis due to high temperature, promoting cell decomposition and recombination, and enabling radio frequency energy output to achieve the desired effect. Among them, the target temperature gradient is: the skin surface is warm, the fat layer is hot, and the muscle layer is not hot.

[0031] 2. In the method of radio frequency power control of tissue temperature field provided by the present invention, in step S2, the default model is a preset temperature model, the radio frequency energy is output according to a preset gear, and the output of the refrigerant is controlled at 18 degrees temperature at a flow rate corresponding to the gear.

[0032] In this embodiment, the RF energy and refrigerant control are output at default small values. The RF energy outputs extremely small energy at low power, and the refrigerant output is temperature-controlled at 18 degrees multiple times at a small flow rate. This can effectively avoid frostbite and crystallization, ensure the treatment effect, and help reduce the sense of pain. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1A schematic diagram of the gas path structure of the handle and treatment head provided by the present invention;

[0035] Figure 2 This is a schematic diagram of the temperature model control of the radio frequency treatment device provided by the present invention.

[0036] Description of reference numerals:

[0037] 1-Handle; 2-Treatment head. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1

[0043] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the gas path structure of the handle and the treatment head in an embodiment of the present invention is shown. Figure 2 The temperature model control schematic diagram of the radio frequency treatment device in the embodiment of the present invention is shown. In addition, the target temperature gradient is: the skin surface is warm, the fat layer is hot, and the muscle layer is not hot.

[0044] The method for controlling tissue temperature field with radio frequency power provided in this embodiment includes:

[0045] Step S1, when the radio frequency treatment device has a pre-output state, the pre-output state is: controlling the radio frequency energy and the refrigerant to output at default values; wherein the radio frequency energy is pre-output at a low power value, and the refrigerant is pre-output at a small flow value; in the pre-output state, the low power value of the radio frequency energy is: less than 0.5W, 100ms pulse width; and, in the pre-output state, the small flow value of the refrigerant is: 0.04ml, 4ms pulse width; in the above process, the temperature of the radio frequency treatment device is controlled so that the target tissue temperature is at 18 degrees to avoid frostbite and crystallization, thereby ensuring the treatment effect and helping to reduce the body pain;

[0046] Step S2, the radio frequency treatment device also has a model control state, and the model control state is: controlling the radio frequency energy and the refrigerant through the default model, the adjustment model and the stable model; wherein the default model is a preset temperature model, the radio frequency energy is output according to the preset gear, and the output of the refrigerant is temperature-controlled at a flow rate corresponding to the gear; wherein the adjustment model detects through a detection mechanism: the target tissue temperature, the impedance value and the radio frequency output parameters, and adjusts the radio frequency energy parameters on the basis of the default model according to the detection data; wherein the stable model combines the static state of the default model and the dynamic changes of the adjustment model, thereby judging whether the adjustment model is stable; and the stable model judges whether the energy output of the radio frequency generator is uniform through the temperature detection mechanism, so as to adjust the response time of the default model and the adjustment model in real time to prevent the overshoot effect of radio frequency energy and refrigerant.

[0047] In the above step S2, the default model is a preset temperature model, the radio frequency energy is output according to the preset gear, and the output of the refrigerant is controlled at 18 degrees temperature control at a flow rate corresponding to the gear. The default model is a temperature model summarized by repeated experiments; the radio frequency treatment device has 16 gears; and the default model adjusts the refrigerant volume in the following range through multiple gears: 0.04ml, 4ms pulse width, to 0.17ml, 17ms pulse width; the corresponding rise temperature of the fat layer is: 0.5℃ to 7.5℃, and the range of controlling the skin layer temperature to be lower than the fat layer temperature is: 0.5℃ to 1.5℃.

[0048] In the above step S2, if the adjustment model detects that the impedance value has changed, the current, voltage and pulse width of the RF generator are adjusted within milliseconds to ensure constant energy output; at the same time, through multi-channel temperature monitoring, the refrigerant pulse width is adjusted in real time according to the temperature change relationship on the skin surface, and the constant flow output is controlled to maintain the temperature rise relationship in the default model through the adjustable pulse width; in the above process, if the output power of the RF generator changes, the RF generator is set to a constant power default adjustment in the next stage of energy control.

[0049] In the above step S2, the stable model combines the static state of the default model and the dynamic changes of the adjustment model; wherein, the proportional relationship is: stable model = A × adjustment model + B × default model, A and B are factors that change quickly or slowly over time, and the values ​​of A and B are proportional to the adjustment time. Wherein, under the initial preset normal state: A = B = 0.5. And, in the above stable model calculation: if the refrigerant and RF energy are much less than expected, A decreases and B increases; if the refrigerant and RF energy are much greater than expected, A increases and B decreases. Wherein, the expected values ​​of refrigerant and RF energy are: RF energy is 20J to 170J for all 16 gears from 0.5 to 8, and the refrigerant is 0.12ml to 0.51ml for all 16 gears from 0.5 to 8. However, in actual RF energy output, energy is adjusted in a closed loop with impedance, and parameters such as voltage, current, and pulse width are slightly adjusted. In this way, the refrigerant needs to follow the slight adjustment. The refrigerant adjusts its own rate of change according to the rate of change of RF energy within 1.2 seconds, and determines a rapid change factor (i.e., A and B) based on the RF energy change rate and the refrigerant change rate over time. A and B are initially 0.5, and then according to the changes in the adjustment model, A and B will produce instantaneous oscillation changes, but will eventually return to the state of 0.5 for slight adjustments, and will not change significantly until the single-shot energy output is completed.

[0050] In this embodiment, in the radio frequency energy control of the radio frequency treatment device, in the pre-output state: the output is performed at a default low power value, and the radio frequency energy is output at a low power of less than 0.5W for 100ms;

[0051] In the RF energy control of the RF treatment device, during the working stage, power is output to the target tissue with a constant RF power; at the same time, the RF power parameters and loop impedance values ​​are monitored and adjusted, but the RF energy size is not adjusted, and the refrigerant control is not involved in the adjustment to ensure power stability.

[0052] In this embodiment, in the refrigerant control of the radio frequency treatment device, in the pre-output state: the refrigerant is output with a small flow rate pulse width of 4ms, and the temperature is controlled at 18 degrees to avoid frostbite and crystallization, which ensures the treatment effect and helps to reduce the body pain;

[0053] In the refrigerant control of the radio frequency treatment device, during the working stage, when the radio frequency energy is output according to the preset energy level, the output of the refrigerant is adjusted according to the parameters of the adjustment model; and the radio frequency treatment device monitors the stability of the output flow, continuous pulse width, pressure and multi-channel temperature monitoring to achieve the regulation of the adjustment model; wherein the refrigerant regulation does not participate in the regulation of the radio frequency energy, and is used to ensure the temperature model of the contact skin layer, and the stability of the radio frequency ensures the heating model of the subcutaneous tissue.

[0054] In addition, in the refrigerant control of the radio frequency therapy equipment, during the working stage, during the 1.2s radio frequency output process, if the pressure is insufficient or the stability is insufficient, the radio frequency therapy equipment will maintain a constant pressure of 6 bar through a liquid pump, and judge the stability again through a flow sensor, and then quickly control the refrigerant pulse width, and monitor and adjust the temperature rise within the total time according to the skin surface temperature regulation in the established model.

[0055] A radio frequency treatment device, used to cooperate with the above-mentioned radio frequency power control tissue temperature field method, comprising: a main unit, a handle 1 and a treatment head 2; an electrode sheet for impedance monitoring is arranged on the target tissue; and a temperature sensor for temperature acquisition is also arranged on the treatment head 2.

[0056] The experimental data are as follows:

[0057] At single energy output, 4cm of live pig 2 The temperature field changes of different layers of subcutaneous tissue are shown in the following table:

[0058]

[0059] The temperature rise data results of the above test show that in the same gear, the single temperature rise of the fat layer is the highest, the skin layer is the second, and the muscle layer is the lowest: that is, the thermal effect generated by the high-frequency alternating current can heat the subcutaneous tissues during the treatment process, and its effect can cover the skin layer, fat layer, and muscle layer according to the predetermined model; and the temperature of the skin surface layer is also lower than the fat layer, indicating that the refrigerant function plays a cooling function during the treatment process, ensuring the safety and somatosensory degree of the skin surface layer, and the temperature rise of the skin layer is also controlled, that is, the refrigerant function can control the severity of various adverse reactions that occur in the skin layer. Similarly, comparing the single temperature rise of each layer of the subcutaneous tissue between different gears, the test group device is the same as the control group device. As the gear increases, the single temperature rise of each layer of the subcutaneous tissue increases: the temperature measurement results of the test show that the single temperature rise value of each layer of the subcutaneous tissue can be adjusted by adjusting the gear to change the heating intensity of the radiofrequency treatment on each layer of the subcutaneous tissue. The operator can also control and ensure the safety of the operation process through the gear adjustment function, and can ensure the expected treatment effect of the operation.

[0060] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A method for controlling tissue temperature field by radio frequency power, characterized in that: include: Step S1, when the radio frequency treatment device has a pre-output state, the pre-output state is: controlling the radio frequency energy and the refrigerant to be output at default values; wherein the radio frequency energy is pre-output at a low power value, and the refrigerant is pre-output at a small flow value; Step S2, the radio frequency treatment device also has a model control state, and the model control state is: controlling the radio frequency energy and the refrigerant through the default model, the adjustment model and the stable model; wherein the default model is a preset temperature model, the radio frequency energy is output according to the preset gear, and the output of the refrigerant is temperature-controlled at a flow rate corresponding to the gear; wherein the adjustment model detects through a detection mechanism: the target tissue temperature, the impedance value and the radio frequency output parameters, and adjusts the radio frequency energy parameters on the basis of the default model according to the detection data; wherein the stable model combines the static state of the default model and the dynamic changes of the adjustment model, thereby judging whether the adjustment model is stable; and the stable model judges whether the energy output of the radio frequency generator is uniform through the temperature detection mechanism, so as to adjust the response time of the default model and the adjustment model in real time to prevent the overshoot effect of radio frequency energy and refrigerant.

2. The method for controlling tissue temperature field by radio frequency power according to claim 1, characterized in that: In the pre-output state, the low power value of the RF energy is: less than 0.5W, 100ms pulse width; and, in the pre-output state, the small flow value of the refrigerant is: 0.04ml, 4ms pulse width; and / or, In the pre-output state, the radio frequency treatment device is temperature controlled so that the target tissue temperature is at 18 degrees to avoid frostbite and crystallization, thereby ensuring the treatment effect while reducing the body's sense of pain.

3. The method for controlling tissue temperature field by radio frequency power according to claim 1, characterized in that: In step S2, the default model is a preset temperature model, the radio frequency energy is output according to a preset gear, and the output of the refrigerant is temperature-controlled at 18 degrees at a flow rate corresponding to the gear.

4. The method for controlling tissue temperature field by radio frequency power according to claim 3, characterized in that: The default model is a temperature model summarized from repeated experiments; the radiofrequency treatment device has 16 gears; and the default model adjusts the amount of refrigerant in the following range through multiple gears: 0.04ml, 4ms pulse width, to 0.17ml, 17ms pulse width; The corresponding rising temperature of the fat layer is: 0.5℃ to 7.5℃, and the temperature of the skin layer is controlled to be lower than the temperature of the fat layer in the range of: 0.5℃ to 1.5℃.

5. The method for controlling tissue temperature field by radio frequency power according to claim 1, characterized in that: In step S2, if the regulation model detects that the impedance value changes, the current, voltage, and pulse width of the RF generator are adjusted within milliseconds to ensure constant energy output; at the same time, through multi-channel temperature monitoring, the refrigerant pulse width is adjusted in real time according to the temperature change relationship on the skin surface to control the constant flow output, so as to maintain the temperature rise relationship in the default model through the adjustable pulse width; If the output power of the radio frequency generator changes, then in the next stage of energy control, the radio frequency generator is set to a default constant power adjustment.

6. The method for controlling tissue temperature field by radio frequency power according to claim 1, characterized in that: In step S2, the stable model combines the static state of the default model and the dynamic changes of the adjustment model; wherein the proportional relationship is: stable model = A×adjustment model + B×default model, A and B are factors that change quickly over time, and the A and B values ​​are proportional to the adjustment time.

7. The method for controlling tissue temperature field by radio frequency power according to claim 6, characterized in that: In the initial preset state: A = B = 0.5, that is, stable model (parameter quantity) = 0.5 × adjustment model (parameter quantity) + 0.5 × default model (parameter quantity); In the calculation of the stability model: if the refrigerant and the RF energy are much smaller than expected, A decreases and B increases; if the refrigerant and the RF energy are much larger than expected, A increases and B decreases.

8. The method for controlling tissue temperature field with radio frequency power according to any one of claims 1 to 7, characterized in that: In the radio frequency energy control of the radio frequency treatment device, in the pre-output state: the output is performed at a default low power value, and the radio frequency energy is output at a low power of less than 0.5W for 100ms; In the RF energy control of the RF treatment device, during the working stage, power is output to the target tissue with a constant RF power; at the same time, the RF power parameters and loop impedance values ​​are monitored and adjusted, but the RF energy size is not adjusted, and the refrigerant control is not involved in the adjustment to ensure power stability.

9. The method for controlling tissue temperature field with radio frequency power according to any one of claims 1 to 7, characterized in that: In the refrigerant control of the radio frequency treatment device, in the pre-output state: the refrigerant is output with a small flow rate pulse width of 4ms, and the temperature is controlled at 18 degrees to avoid frostbite and crystallization, ensuring the treatment effect while reducing the body pain; In the refrigerant control of the radio frequency treatment device, during the working stage, when the radio frequency energy is output according to the energy of the preset gear, the output of the refrigerant is adjusted according to the parameters of the adjustment model; and the radio frequency treatment device monitors the stability of the output flow, continuous pulse width, pressure and multi-channel temperature monitoring to realize the regulation of the adjustment model; Among them, the refrigerant adjustment does not participate in the adjustment of the radio frequency energy size, which is used to ensure the temperature model of the skin contact layer, and the stability of the radio frequency ensures the heating model of the subcutaneous tissue.

10. The method for controlling tissue temperature field by radio frequency power according to claim 9, characterized in that: In the refrigerant control of the radio frequency treatment device, during the working stage, during the 1.2s radio frequency output process, if the pressure is insufficient or the stability is insufficient, the radio frequency treatment device maintains a constant pressure of 6 bar through a liquid pump, and judges the stability again through a flow sensor, and then quickly controls the refrigerant pulse width, and monitors and adjusts the temperature rise within the total time according to the skin surface temperature regulation in the established model.

11. A radio frequency treatment device using the method of radio frequency power control of tissue temperature field according to claims 1 to 10, characterized in that: include: A main unit, a handle (1) and a treatment head (2); An electrode sheet for realizing impedance monitoring is arranged on the target tissue; and a temperature sensor for realizing temperature acquisition is also arranged on the treatment head (2).

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