An output power adaptive control system for magnetic stimulation and a control method thereof

Abstract

The present application relates to a kind of output power adaptive control system for magnetic stimulation and its control method, mainly solve when magnetic stimulation output, intensity can be unrestrictedly adjusted to cause coil over-temperature and have to suspend magnetic field output and wait for cooling, thereby affecting clinical use.The existing scheme is mostly one-size-fits-all limit the maximum intensity that can be reached under certain frequency or certain parameter scheme, and the present scheme is to adaptively calculate the maximum intensity that can be output under the frequency of magnetic stimulation output, output time, interval time and the type of stimulation coil, to ensure that magnetic stimulation device can be normally and continuously output without the phenomenon of insufficient intensity or frequent over-temperature, thereby ensuring the experience of clinical application.

Description

Technical Field

[0001] This invention relates to the field of magnetic stimulation technology, and in particular to an adaptive control system and control method for output power of magnetic stimulation. Background Technology

[0002] The application of magnetic stimulation technology is already quite mature. With continuous technological innovation, not only in mental rehabilitation, neurological rehabilitation, and now increasingly recognized postpartum rehabilitation, the maximum magnetic field strength that magnetic stimulation can achieve is also getting higher and higher, and the frequency of magnetic stimulation pulses output by magnetic stimulation devices is also constantly increasing. As a result, how to balance the high intensity and high frequency output has become a problem that needs to be considered.

[0003] The magnetic stimulation output circuit mainly consists of a main control board, a thyristor, a boost power supply, an energy storage pulse capacitor, a resistive-capacitive absorption plate, and a coil. The main control board controls the boost power supply to start boosting the voltage. The charging circuit inside the boost power supply charges the energy storage pulse capacitor. After charging is complete, the main control board turns on the thyristor, and the pulse capacitor discharges through the coil. When the current passes through the coil, it generates a spatial magnetic field.

[0004] When outputting magnetic stimulation, a large current pulse flows through the coil, causing the temperature inside the coil to rise. However, the cooling capacity of the coil's heat dissipation system is limited. Under high-frequency and high-intensity repetitive stimulation, the temperature will rise rapidly. If the temperature exceeds the safe level, the device will stop outputting and can only resume operation after the temperature drops. This not only affects the use of the device but also accelerates the aging of the coil.

[0005] Currently, various magnetic stimulators either ignore this issue or use a one-size-fits-all approach, limiting the intensity to a certain range at a fixed stimulation parameter or above a certain stimulation frequency. This approach fails to consider the effective output power and differences between coils. For example, when stimulating at a very high frequency with a short stimulation time and a long stimulation interval, the output duty cycle is relatively small. In this case, heat dissipation is not actually a problem, but the intensity is limited, potentially failing to achieve the desired effect. Furthermore, different magnetic stimulation coils have different functions, structures, and Q values, resulting in varying heat dissipation effects. A simplistic and general limitation that doesn't consider the differences between coils is not only highly restrictive but also fails to realize the full potential of the equipment. Summary of the Invention

[0006] The purpose of this invention is to provide an adaptive control system and method for the output power of magnetic stimulation. By balancing the relationship between the magnetic stimulation output frequency, stimulation output time, stimulation interval time, and intensity, the heat dissipation system of the magnetic stimulation device can ensure the continuous and stable operation of the device, so as to meet our normal use of the device and also allow the device to perform at its highest level, thereby solving the problems encountered in the background art.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] An adaptive control system for output power of magnetic stimulation includes an upper computer subsystem, a lower computer subsystem, and a heat dissipation system. The upper computer subsystem is connected to the lower computer subsystem, and the heat dissipation system is connected to both the upper computer subsystem and the lower computer subsystem.

[0009] The host computer subsystem includes a core board and a human-computer interaction module connected to the core board. The host computer subsystem is used to edit the parameters of the magnetic stimulation output, control the start and end of the magnetic stimulation, adjust the intensity of the stimulation output when the magnetic stimulation is output, and display the magnetic stimulation information.

[0010] The lower-level subsystem includes a main control module, a power filter, and at least one magnetic stimulation coil. Each magnetic stimulation coil is connected to the main control module and the power filter, respectively. The lower-level subsystem is used to generate a pulsed magnetic field.

[0011] The heat dissipation system includes a heat dissipation control module and a heat dissipation device. The input end of the heat dissipation control module is connected to the core board, and the output end of the heat dissipation control module is connected to the heat dissipation device. The heat dissipation system is used to cool down the stimulation coil and the host.

[0012] In the above scheme, the main control module of the lower-level subsystem receives the stimulation output parameters sent by the upper-level subsystem and outputs the pulse magnetic field in an orderly manner; the upper-level subsystem adjusts the intensity of the stimulation output and sends it to the lower-level subsystem, which then adjusts the charging voltage according to this intensity.

[0013] As a preferred embodiment, each of the magnetic stimulation coils includes at least one boost power supply and one coil, with the output of each boost power supply connected to a pulse capacitor, which is connected to the coil.

[0014] As a preferred embodiment, each of the magnetic stimulation coils includes a boost power supply and at least one coil, the output of which is connected to a pulse capacitor, which is connected to at least one of the coils.

[0015] In the above scheme, the heat dissipation device includes a pump, a water tank, and a fan. The output terminal of the heat dissipation control module is connected to the pump, the water tank, and the fan respectively. The pump is connected to the water tank through a flow sensor. The heat dissipation control module is connected to the water tank through a liquid level sensor. The water tank is connected to the lower-level subsystem through a separator. The fan is connected to the heat dissipation control module through a speed feedback module.

[0016] A control method for an adaptive control system of output power for magnetic stimulation includes the following steps:

[0017] S1: Select the type of magnetic stimulation coil and obtain the relevant parameters of the current magnetic stimulation coil;

[0018] S2: Edit stimulus output parameters and send out stimulus output parameters;

[0019] S3: Start stimulating output, determine if the stimulus intensity has changed, and if it has changed, calculate the current output intensity W;

[0020] S4: Determine whether the intensity adjusted by the system is greater than the current intensity W. If it is greater, prompt that adjustment is not allowed. If it is not greater, issue the intensity and repeat step S3.

[0021] In the above scheme, after obtaining the actual system parameters, the system's maximum output power P is kept constant, and the system's maximum output intensity W is calculated when other system parameters change.

[0022] Furthermore, the system's highest output power P is equal to the Joule power of the entire stimulation coil.

[0023]

[0024] Where N is the number of circles in the coil, N = 1 for large circles and N = 2 for figure-eight shapes, ρ is the conductivity of the winding wire, b is the coil thickness, and R... out R is the outer diameter of the coil. in Where T is the inner diameter of the coil, D is the total time of one stimulation cycle, and D is the duty cycle. P T is the duration of a single stimulus pulse. G U is the time interval between two adjacent pulses. m R is the highest voltage of the system. S Let W be the total equivalent resistance of the system and W be the output strength.

[0025] Compared with the prior art, the beneficial effects of the present invention are: the present solution adaptively calculates the maximum intensity that can be output under these parameters based on the frequency, output time, interval time and type of stimulation coil of the magnetic stimulation output, so as to ensure that the magnetic stimulation device can output normally and continuously without insufficient intensity or frequent overheating, thereby ensuring the clinical application experience. Attached Figure Description

[0026] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0027] Figure 1 This is a schematic diagram of the overall structure of the magnetic stimulation system in this invention;

[0028] Figure 2 This is a schematic diagram of the overall structure of the magnetic stimulation system in one embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the heat dissipation system in this invention;

[0030] Figure 4 This is a flowchart of the control method for the magnetic stimulation system in this invention;

[0031] Figure 5 The temperature rise curve of the figure-eight coil under the same parameters;

[0032] Figure 6 Temperature rise curves of a figure-eight coil under different parameters with power limitation;

[0033] Figure 7 The temperature rise curves of the figure-eight coil under different parameters without power limiting are shown.

[0034] Figure 8 This is a temperature rise curve diagram for a large circular coil and a large figure-eight coil under the same parameters. Detailed Implementation

[0035] To make the technical means, creative features, objectives, and effects of this invention readily understandable, the invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the relevant components of the invention.

[0036] According to the technical solution of the present invention, without changing the essential spirit of the present invention, those skilled in the art can propose various interchangeable structural methods and implementations. Therefore, the following detailed embodiments and accompanying drawings are merely exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or restriction of the technical solution of the present invention.

[0037] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0038] Example 1, such as Figure 1 As shown, an adaptive control system for output power of magnetic stimulation includes an upper computer subsystem, a lower computer subsystem, and a heat dissipation system. The upper computer subsystem and the lower computer subsystem are connected via wired communication. The heat dissipation system is connected to both the upper computer subsystem and the lower computer subsystem. The main control module in the lower computer subsystem receives the stimulation output parameters sent by the upper computer subsystem and outputs pulsed magnetic fields in an orderly manner.

[0039] The host computer subsystem includes a core board and a human-computer interaction module connected to the core board. The host computer subsystem is used to edit the parameters of the magnetic stimulation output, control the start and end of the magnetic stimulation, adjust the intensity of the stimulation output during the magnetic stimulation output, and display magnetic stimulation information such as stimulation time, stimulation status, and coil temperature.

[0040] The lower-level subsystem includes a main control module, a power filter, and at least one magnetic stimulation coil. Each magnetic stimulation coil is connected to the main control module and the power filter, respectively. The lower-level subsystem is used to generate pulsed magnetic fields.

[0041] The heat dissipation system includes a heat dissipation control module and a heat dissipation device. The input end of the heat dissipation control module is connected to the core board, and the output end of the heat dissipation control module is connected to the heat dissipation device. The heat dissipation system is used to cool down the stimulation coil and the host.

[0042] The main control module in the lower-level subsystem receives the stimulation output parameters sent by the upper-level subsystem and outputs pulsed magnetic fields in an orderly manner; the upper-level subsystem adjusts the intensity of the stimulation output and sends it to the lower-level subsystem, which then adjusts the charging voltage according to this intensity.

[0043] Specifically, the main control module receives stimulation output parameters from the host computer subsystem, including the number of circles in the coil, the conductivity of the winding wires, the coil thickness, the outer diameter of the coil, the inner diameter of the coil, the total time of one stimulation cycle, the duty cycle, the duration of a single stimulation pulse, the interval between two adjacent pulses, the system's maximum voltage, the system's total equivalent resistance, and the stimulation intensity, among other magnetic stimulation information. Then, the main control module enters the stimulation output preparation state. After the host computer subsystem issues a start command, the main control module of the lower-level subsystem controls the boost power supply to charge the pulse capacitor and output a pulsed magnetic field according to the preset stimulation output parameters. At this time, the host computer can adjust the intensity of the stimulation output and send it to the lower-level subsystem, which then adjusts the charging voltage accordingly.

[0044] By employing the above methods, the magnetic stimulation output frequency and stimulation output time are balanced, and the relationship between stimulation interval time and intensity is achieved. This ensures that the heat dissipation system of the magnetic stimulation device can meet the needs of continuous and stable operation, allowing for normal use of the device and maximizing its performance.

[0045] As a preferred embodiment, each magnetic stimulation coil includes at least one boost power supply and one coil, with the output of each boost power supply connected to a pulse capacitor, which is connected to the coil.

[0046] For example, multiple magnetic stimulation coils can be set up, where the first boost power supply is connected to the first coil through the first pulse capacitor; the second boost power supply is connected to the second coil through the second pulse capacitor; the third boost power supply is connected to the third coil through the third pulse capacitor; and so on.

[0047] Please see Figure 2 As a preferred embodiment, each magnetic stimulation coil includes a boost power supply and at least one coil. The output of the boost power supply is connected to a pulse capacitor, which is connected to at least one coil.

[0048] For example, after a boost power supply is connected to a pulse capacitor, that pulse capacitor can be connected to multiple coils, such as the first coil, the second coil, the third coil, and so on.

[0049] Please see Figure 3 In the above scheme, the heat dissipation device includes a pump, a water tank, and a fan. The output of the heat dissipation control module is connected to the pump, water tank, and fan respectively, controlling each heat dissipation device individually to facilitate timely adjustments based on feedback data. The pump is connected to the water tank via a flow sensor, which also transmits data to the heat dissipation control module. The heat dissipation control module is connected to the water tank via a level sensor to obtain the water level. The water tank is connected to the lower-level subsystem via a separator, allowing it to connect to each coil in the lower-level subsystem. Each coil then feeds back heat data to the impeller pump or the heat dissipation control module for further control of the heat dissipation device's output function. The fan is connected to the heat dissipation control module via a speed feedback module to obtain the fan's output power and adjust its speed to change its output power. Furthermore, the fan not only cools the main unit but also the water tank, providing cooling for it.

[0050] Example 2, please refer to Figure 4 A control method for an adaptive control system of output power for magnetic stimulation includes the following steps:

[0051] S1: Select the type of magnetic stimulation coil and obtain the relevant parameters of the current magnetic stimulation coil, such as N, ρ, b, and R. out R in ,R S Parameters;

[0052] S2: Edit stimulus output parameters and send out stimulus output parameters, such as sending T, D, T P T G U m Parameters such as W;

[0053] S3: Start stimulation output, determine if the stimulation intensity changes, if it changes, calculate the current output intensity W; if it does not change, continue to monitor whether the intensity changes.

[0054] S4: Determine whether the intensity adjusted by the system is greater than the current intensity W. If it is greater, prompt that adjustment is not allowed and issue an intensity. If it is not greater, issue the intensity directly. Finally, repeat steps S3 and S4 to continue intensity monitoring.

[0055] In the above scheme, after obtaining the actual system parameters, the system's maximum output power P is kept constant, and the system's maximum output intensity W is calculated when other system parameters change.

[0056] Furthermore, the system's highest output power P is equal to the Joule power of the entire stimulation coil.

[0057]

[0058] The maximum output intensity W can be obtained through conversion:

[0059]

[0060] Where N is the number of circles in the coil, N = 1 for large circles and N = 2 for figure-eight shapes, ρ is the conductivity of the winding wire, b is the coil thickness, and R... out R is the outer diameter of the coil. in Where T is the inner diameter of the coil, T is the total time of one stimulation cycle, and D is the duty cycle (the ratio of the stimulation output time to the total cycle). P T is the duration of a single stimulus pulse. G U is the time interval between two adjacent pulses. m R is the highest voltage of the system. S Let W be the total equivalent resistance of the system and W be the output strength.

[0061] Example 3: When applying a control method for an adaptive control system of output power for magnetic stimulation, the composition of the heat dissipation system differs between different device types. For example, different heat dissipation methods result in different heat dissipation capacities, or the heat dissipation systems designed for transcranial magnetic stimulators and pelvic floor magnetic stimulators differ due to their different application scenarios. This solution is applicable to various types of magnetic stimulation devices, but it involves a strong correlation with the heat dissipation system. Therefore, actual testing is required for different types of devices, and similarly, actual testing is also required for the same device type when using different coil types.

[0062] The following descriptions are all based on the same cooling system:

[0063] For example, a specific magnetic stimulation device has a specific coil. Based on the maximum intensity of the stimulation coil, the Q value of the stimulation coil, the heat dissipation capacity of the device, application requirements, application scenarios, and application environment, a parameter for a sustainable stimulation output is fitted, and this stimulation parameter is used for actual verification.

[0064] First, record the initial temperature of the coil before stimulation begins. Once stimulation output begins, record the temperature changes of the coil during the process. Next, observe whether the coil exceeds the safe temperature. This scheme uses 40℃ as the safe temperature. If the safe temperature is not exceeded, observe whether the system reaches thermal equilibrium and what the temperature rise is at thermal equilibrium. Then, based on the test results, continuously adjust the stimulation output parameters: magnetic stimulation frequency, stimulation output time, and stimulation interval. Finally, obtain a power parameter that allows this type of system to operate continuously.

[0065] If the coil type is changed, the test should be repeated. However, for similar coil types, such as large round coils and large figure-eight coils, which have the same maximum strength and application, their temperature rise curves can be directly compared. If the differences are not significant, a simple unified plan can be implemented.

[0066] The same procedure applies to different types of equipment or different cooling systems.

[0067] To verify the accuracy and effectiveness of the power limiting strategy proposed in this invention, a magnetic stimulation device, i.e., a heat dissipation system, was used for actual testing. Comparative data obtained through implementation can be found in [link to relevant documentation]. Figures 5 to 8 .

[0068] Figure 5 To use the same stimulus output parameters with a large figure-eight coil: N=2, output T G With a value of 0.2, an output duty cycle of 100%, and a stimulation intensity of 100%, the temperature change trend was tested at different starting temperatures. The graph shows that under the same conditions, the stimulation output is not related to the starting temperature, and thermal equilibrium can be reached in 60 minutes, with the temperature rise being basically the same.

[0069] Figure 6 To use a power limiting strategy with T for large figure-eight coils G (1) = 0.2, D(1) = 100%, W(1) = 100%, calculate T G When (2) = 0.05 and D(2) = 50%, the temperature change curves when W(2) = 100% show that the temperature change curves are the same, indicating that the strategy is highly accurate.

[0070] Figure 7 To use a large figure-eight coil without employing a power limiting strategy, with T G (3) = 0.2, D(3) = 100%, W(3) = 100%, when T G(4) = 0.05, D(4) = 50%, without using the power limiting strategy, the temperature change curve when W(4) = 100% is directly shown in the figure. It can be seen that the temperature rises very quickly without the limit, and the output stops at the safe temperature after more than 20 minutes, indicating that the strategy is very effective.

[0071] Figure 8 The graph shows the temperature change curves of the large circular coil and the large figure-eight coil under the same stimulation parameters. Since the large circular coil and the large figure-eight coil have the same maximum intensity and similar applications, the temperature rise curves of the two coils are similar, and the cooling effect of the large circular coil is significantly better than that of the large figure-eight coil. If the reference for the large figure-eight coil can meet the clinical application requirements of the large circular coil, the large circular coil can use the same reference as the large figure-eight coil, or they can be tested and verified independently.

[0072] Existing devices, when outputting magnetic stimulation, allow for unlimited intensity adjustment, which can cause coil overheating, forcing the magnetic field output to be stopped and allowed to cool down, thus affecting clinical use. Most existing solutions rigidly limit the maximum intensity achievable at a specific frequency or with certain parameters. This solution, however, adaptively calculates the maximum output intensity based on the frequency, output time, interval, and type of stimulation coil, ensuring the magnetic stimulation device can output normally and continuously without insufficient intensity or frequent overheating, thereby guaranteeing a better clinical experience.

[0073] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An adaptive control system for output power of magnetic stimulation, characterized in that: It includes a host computer subsystem, a slave computer subsystem, and a heat dissipation system. The host computer subsystem is connected to the slave computer subsystem, and the heat dissipation system is connected to both the host computer subsystem and the slave computer subsystem. The host computer subsystem includes a core board and a human-computer interaction module connected to the core board. The host computer subsystem is used to edit the parameters of the magnetic stimulation output, control the start and end of the magnetic stimulation, adjust the intensity of the stimulation output during magnetic stimulation, and display the magnetic stimulation information. Based on the principle of keeping the system's maximum output power P constant, the stimulation output intensity W is dynamically calculated and adjusted according to the real-time parameters of the magnetic stimulation coil. Based on the geometric parameters of the magnetic stimulation coil, the system's maximum output power P is kept constant, and the system's maximum output intensity W is calculated when other system parameters change. The lower-level subsystem includes a main control module, a power filter, and at least one magnetic stimulation coil. Each magnetic stimulation coil is connected to the main control module and the power filter, respectively. The lower-level subsystem is used to generate a pulsed magnetic field. The heat dissipation system includes a heat dissipation control module and a heat dissipation device. The input end of the heat dissipation control module is connected to the core board, and the output end of the heat dissipation control module is connected to the heat dissipation device. The heat dissipation system is used to cool down the stimulation coil and the host. Wherein, the highest output power P of the system is the Joule power of the entire stimulation coil: ； The geometric parameters of the magnetic stimulation coil include the following: N is the number of circles in the coil, with N=1 for large circles and N=2 for figure-eight circles; ρ is the conductivity of the winding wire; and b is the coil thickness. The outer diameter of the coil. Where is the inner diameter of the coil, T is the total time of one stimulation cycle, and D is the duty cycle. The duration of a single stimulus pulse. The time interval between two adjacent pulses. This is the highest voltage in the system. W is the total equivalent resistance of the system, and W is the output strength.

2. The adaptive output power control system for magnetic stimulation according to claim 1, characterized in that: The main control module in the lower-level subsystem receives the stimulation output parameters sent by the upper-level subsystem and outputs pulsed magnetic fields in an orderly manner; the upper-level subsystem adjusts the intensity of the stimulation output and sends it to the lower-level subsystem, which then adjusts the charging voltage according to this intensity.

3. The adaptive output power control system for magnetic stimulation according to claim 1, characterized in that: Each of the magnetic stimulation coils includes at least one boost power supply and one coil. The output of each boost power supply is connected to a pulse capacitor, which is connected to the coil.

4. The adaptive output power control system for magnetic stimulation according to claim 3, characterized in that: Each of the magnetic stimulation coils includes a boost power supply and at least one coil. The output of the boost power supply is connected to a pulse capacitor, which is connected to at least one of the coils.

5. The adaptive output power control system for magnetic stimulation according to claim 1, characterized in that: The heat dissipation device includes a pump, a water tank, and a fan. The output of the heat dissipation control module is connected to the pump, the water tank, and the fan respectively. The pump is connected to the water tank through a flow sensor. The heat dissipation control module is connected to the water tank through a liquid level sensor. The water tank is connected to the lower-level subsystem through a separator. The fan is connected to the heat dissipation control module through a speed feedback module.

6. The adaptive output power control system for magnetic stimulation according to claim 1, characterized in that: The control method of this system includes the following steps: S1: Select the type of magnetic stimulation coil and obtain the relevant parameters of the current magnetic stimulation coil; S2: Edit stimulus output parameters and send out stimulus output parameters; S3: Start stimulating output, determine if the stimulus intensity has changed, and if it has changed, calculate the current output intensity W; S4: Determine whether the intensity adjusted by the system is greater than the current intensity W. If it is greater, prompt that adjustment is not allowed. If it is not greater, issue the intensity and repeat step S3.

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