Magnetic stimulation system with controllable stimulation area

Abstract

The invention discloses a magnetic stimulation system with a controllable stimulation area, and relates to the technical field of medical instrument use, the system comprises a magnetic field generation module, an adjustable magnetic field module and a control module; according to the magnetic field generation module, a main circuit and a primary coil are connected to form a pulse magnetic field generation circuit, energy stored in the circuit is released into the primary coil in a pulse mode by controlling the discharging process of the main circuit to the primary coil, and therefore a pulse magnetic field is generated. The adjustable magnetic field module is provided with a secondary coil on the periphery of the primary coil and is connected with a corresponding regulation and control circuit, and the secondary coil generates a magnetic field which is opposite to the magnetic field of the primary coil in direction and adjustable in strength under the control of the regulation and control circuit; the control module controls the magnetic field intensity of the secondary coil through the regulation and control circuit according to user somatosensory feedback, so that the magnetic field generated by the secondary coil counteracts the magnetic field of the outer ring of the primary coil layer by layer, and regulation and control of the magnetic field range of the primary coil are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical device use, and in particular to a magnetic stimulation system with controllable stimulation area. Background Art

[0002] In the field of medical device technology, pelvic floor magnetic stimulation, as a non-invasive physical therapy method, has been widely used in the treatment of pelvic floor dysfunction diseases. This technology is based on the Faraday electromagnetic induction principle. Through the instantaneous discharge of high-voltage and high-energy current in the magnetic field coil, a high-field magnetic field is induced to act on human tissue, thereby generating induced current in human tissue, stimulating the pelvic floor nerves and muscles, thereby triggering a series of physiological and biochemical reactions to achieve the purpose of treatment. Magnetic stimulation technology has strong penetration, can stimulate deeper muscles and nerves, and has a relatively wide range of stimulation, showing significant advantages in the treatment of pelvic floor dysfunction diseases. However, there are still some problems that need to be solved in the existing magnetic stimulation technology.

[0003] First, the stimulation range of magnetic stimulation is relatively difficult to control accurately: compared with electrical stimulation, magnetic stimulation has a wider stimulation range and can stimulate the entire pelvic floor nerves and muscles, not just the muscles and nerves around the electrodes. Although this non-specific stimulation method is helpful for treatment, it may also cause discomfort in non-treatment areas. As the magnetic field strength increases, the discomfort in non-treatment areas will also increase, thus affecting the patient's treatment experience and effect.

[0004] Secondly, the pelvic floor anatomy and physiological characteristics of different patients are different: the pelvic floor is divided into the outer layer, the middle layer, and the inner layer. The muscle tissue, fascia distribution, and fat content of each layer are different. This difference in anatomical structure leads to different unnecessary stimulation areas for different patients. Therefore, how to adjust the range of magnetic stimulation according to the individual differences of patients to achieve more accurate and personalized treatment has become an important challenge facing current magnetic stimulation technology. Summary of the invention

[0005] The object of the present invention is to provide a magnetic stimulation system with controllable stimulation area to solve the problems raised in the prior art.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a magnetic stimulation system with controllable stimulation area, the system comprising a magnetic field generating module, an adjustable magnetic field module, and a control module;

[0007] The magnetic field generating module is a pulse magnetic field generating circuit formed by connecting a main circuit and a primary coil. By controlling the discharge process of the main circuit to the primary coil, the energy stored in the circuit is released to the primary coil in the form of pulses, thereby generating a pulse magnetic field.

[0008] The adjustable magnetic field module is provided with a secondary coil outside the primary coil and connected to a corresponding control circuit. Under the control of the control circuit, the secondary coil generates a magnetic field with an adjustable intensity and opposite direction to the magnetic field of the primary coil;

[0009] The control module adjusts the magnetic field range of the primary coil according to the user's body feedback, and controls the magnetic field strength of the secondary coil through the control circuit, so that the magnetic field generated by the secondary coil offsets the magnetic field of the outer circle of the primary coil layer by layer, thereby realizing the regulation of the magnetic field range of the primary coil.

[0010] Further, the primary coil L1 in the magnetic field generating module is an inductor composed of multiple turns of copper wire, and the main circuit includes a switch S, a high-voltage power supply V, a pulse capacitor C, a diode D, a thyristor T and a resistor Rf, the first end of the switch S is connected to the positive electrode of the power supply V, the second end of the switch S is connected to the first end of the thyristor T, the second end of the thyristor T is connected to the first end of the loop equivalent impedance structure Rf, the second end of the resistor Rf is connected to the first end of the primary coil L1, the second end of the primary coil L1 is connected to the first end of the pulse capacitor C, the second end of the pulse capacitor C is connected to the second end of the switch S, the first end of the diode D is connected to the second end of the pulse capacitor C, and the second end of the diode D is connected to the first end of the resistor Rf;

[0011] The primary coil is disconnected after the pulse capacitor C is charged to a predetermined voltage through a high-voltage V power supply, and the control module controls the thyristor T to discharge the primary coil L1, thereby generating a pulse magnetic field; the magnetic stimulation intensity of the primary coil decreases layer by layer from the inner circle to the outer circle.

[0012] In the above technical solution, by controlling the discharge process of the main circuit to the primary coil, the energy stored in the circuit can be efficiently released to the primary coil in the form of pulses, thereby generating a strong pulse magnetic field; since the charging voltage and discharge process of the pulse capacitor are controllable, the intensity of the magnetic stimulation generated by the primary coil can be accurately adjusted to meet the needs of different application scenarios.

[0013] Furthermore, the secondary coil in the adjustable magnetic field module is an inductor composed of multiple turns of copper wire. When the current in the primary coil L1 changes, the secondary coil L2 generates an induced current according to Faraday's law of electromagnetic induction. According to Lenz's law, the direction of the induced current is opposite to the current in the primary coil L1. The relationship between the induced current in the secondary coil L2 and the current in the primary coil L1 is:

[0014]

[0015] where i 2 is the induced current in the secondary coil, i 1 is the current in the primary coil, r 2is the resistance of the secondary coil, L s2 is the inductance of the secondary coil, M is the mutual inductance between the primary coil and the secondary coil, and jw is the angular frequency of the alternating current; according to the above formula, in the case of low frequency, r 2 >>jwL s2 , indicating that the resistance of the secondary coil is much greater than the inductance, so the inductance term in the above formula can be ignored; the induced current in the secondary coil is simplified to It means that under low frequency conditions, the induced current in the secondary coil is mainly determined by the resistance in the secondary coil and the current in the primary coil; the induced current i 2 The current i in the primary coil L1 1 Therefore, by adjusting the current in the secondary coil, the distribution range of the magnetic field of the primary coil can be changed.

[0016] The control circuit in the adjustable magnetic field module is used to control the current path and magnetic field strength of the secondary coil, including bidirectional thyristors T1 and T2, load resistor Rf1, energy storage capacitor C1, current limiting resistor Rc, backup high voltage power supply V1, two control switches S1 and S2, wherein the current limiting resistor Rc is used to limit the current of the backup high voltage power supply V1 through the energy storage capacitor C1; the first end of the secondary coil L2 is connected to the first end of the bidirectional thyristor T1, the second end of the secondary coil L2 is connected to the first end of the bidirectional thyristor T2, the second end of the bidirectional thyristor T1 is connected to the first end of the load resistor Rf1, and the load The second end of the resistor Rf1 is connected to the first end of the energy storage capacitor C1, the second end of the energy storage capacitor C1 is connected to the second end of the bidirectional thyristor T2, the first end of the control switch S1 is connected to the second end of the load resistor Rf1, the second end of the control switch S1 is connected to the second end of the bidirectional thyristor T2, the first end of the energy storage capacitor C1 is connected to the first end of the current limiting resistor Rc, the second end of the energy storage capacitor C1 is connected to the negative electrode of the backup high-voltage power supply V1, the first end of the control switch S2 is connected to the second end of the current limiting resistor Rc, and the second end of the control switch S2 is connected to the positive electrode of the backup high-voltage power supply V1.

[0017] In the above technical solution, through the control of the regulating circuit, the secondary coil can generate a magnetic field with an adjustable strength and a direction opposite to the magnetic field of the primary coil, thereby realizing precise adjustment of the magnetic field strength of the primary coil; by adjusting the magnetic field generated by the secondary coil, the application range of magnetic stimulation can be further expanded, and the intensity of magnetic stimulation can be reduced to alleviate patient discomfort.

[0018] Furthermore, the control module includes a main control board unit, a single-chip computer unit, a detection unit, a magnetic field strength calculation unit, a magnetic field strength control unit, and a regulation unit. The main control board unit provides an input interface for inputting corresponding control instructions according to the user's somatosensory feedback. The detection unit is used to monitor the current and magnetic field strength of the primary coil and the secondary coil L2 in real time, and feed the data back to the single-chip computer unit; the single-chip computer unit is used to receive the control instructions input by the user and determine whether to adjust the magnetic field strength or the range of action of the magnetic field based on the detection results of the detection unit.

[0019] The magnetic field strength calculation unit is used to calculate the magnetic induction intensity generated by the primary coil L1 and the secondary coil L2; when the primary coil L1 generates an excitation current i 1 When the secondary coil L2 generates an induced current i due to the mutual inductance characteristics 2 , the induced current i 2 With the excitation current i 1 The relationship is:

[0020]

[0021] Where N 1 and N 2 are the number of turns of the primary coil L1 and the secondary coil L2 respectively;

[0022] At this time, the magnetic induction intensity generated by the secondary coil is B 2 :

[0023]

[0024] where μ 2 is the magnetic permeability of the secondary coil L2, L e2 is the magnetic path length of the secondary coil L2;

[0025] The magnetic induction intensity of the primary coil is B 1 :

[0026]

[0027] where μ 1 is the magnetic permeability of the primary coil L1, L e1 is the magnetic path length of the primary coil L1.

[0028] The magnetic field strength control unit obtains the magnetic induction strength B of the primary coil L1 and the secondary coil L2 through the magnetic field strength calculation unit. 1 and B 2 , and the suppressed magnetic induction intensity value B = B 1 -B 2 ; By controlling the excitation current of the secondary coil L2, the magnetic induction intensity B 2The enhancement and weakening of i is realized by controlling the charging and discharging of the secondary coil L2 by the energy storage capacitor C1. 2 The current size and direction change, when i 2 The direction of current and i 1 When in the same direction, the magnetic field strength increases, expressed as B=B1+B2.

[0029] The control unit adjusts the interference magnetic field of the secondary coil by controlling the main circuit and the control circuit; when the secondary coil L2 does not generate an induced current, a pre-charging operation is performed: the primary coil L1 pre-charges the energy storage capacitor C1 through the magnetic field generated by it, and the secondary coil L2 synchronously controls the backup high-voltage power supply V1 to pre-charge the energy storage capacitor C1. When the voltage of the energy storage capacitor C1 reaches the set voltage value, the switch S2 is disconnected to stop the pre-charging operation; when the secondary coil L2 generates an induced current, it enters the magnetic field adjustment stage: the intensity of the interference magnetic field generated by the secondary coil L2 is adjusted by controlling the conduction polarity of the bidirectional thyristors T1 and T2. When the control switch S1 is disconnected, the induced current generated by the primary coil L1 charges the energy storage capacitor C1 again, and the primary coil L1 and the energy storage capacitor C1 form an oscillation circuit; by adjusting the predetermined voltage value of the energy storage capacitor C1, the control of the magnetic field intensity of the secondary coil L2 is achieved.

[0030] In the above technical solution, the control module realizes intelligent control of the entire system through a single-chip microcomputer, and can automatically adjust the magnetic field strength and range according to the user's physical feedback and real-time monitoring data; through the magnetic field strength calculation unit, the magnetic induction intensity generated by the primary coil and the secondary coil can be accurately calculated to provide accurate data support for adjusting the magnetic field strength and range; the magnetic field strength control unit realizes dynamic adjustment of the magnetic field strength by controlling the induced current of the secondary coil and the charging and discharging process of the energy storage capacitor according to the calculated magnetic induction intensity value; by accurately calculating and dynamically adjusting the magnetic field strength, the effect of magnetic stimulation can be further optimized, the accuracy of magnetic stimulation can be improved, and the discomfort during magnetic stimulation can be reduced.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention can adjust the magnetic stimulation range in real time according to the user's somatosensory feedback. The corresponding control instructions are input through the control interface, and the single-chip microcomputer unit receives and processes these instructions, thereby realizing precise control of the magnetic stimulation range and intensity. This design effectively improves the targetedness and comfort of the treatment, so that the system can adapt to the needs of different patients and different treatment stages.

[0033] The present invention can not only adjust the intensity of magnetic stimulation by controlling the discharge process of the primary coil, but also adjust the magnetic field strength of the secondary coil to offset the magnetic field of the outer circle of the primary coil layer by layer, thereby achieving precise control of the magnetic stimulation area. This dual adjustment mechanism not only enables the magnetic stimulation system to act on the target area more accurately, reducing the potential impact on non-target areas, but also provides a wider and more refined selection of magnetic stimulation intensity to meet different treatment needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A system flow chart of a magnetic stimulation system with controllable stimulation area according to the present invention;

[0035] Figure 2 A schematic diagram of the coil structure of a magnetic stimulation system with controllable stimulation area according to the present invention;

[0036] Figure 3 The present invention discloses a pulse magnetic field generating circuit and a secondary coil magnetic field regulating circuit diagram of a magnetic stimulation system with controllable stimulation area. DETAILED DESCRIPTION

[0037] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0038] Example: Figure 1-Figure 3 As shown, the present invention provides a magnetic stimulation system with controllable stimulation area, the system includes a magnetic field generating module, an adjustable magnetic field module, and a control module;

[0039] The magnetic field generating module is a pulse magnetic field generating circuit formed by connecting a main circuit and a primary coil. By controlling the discharge process of the main circuit to the primary coil, the energy stored in the circuit is released to the primary coil in the form of pulses, thereby generating a pulse magnetic field.

[0040] The adjustable magnetic field module is provided with a secondary coil outside the primary coil and connected to a corresponding control circuit. Under the control of the control circuit, the secondary coil generates a magnetic field with an adjustable intensity and opposite direction to the magnetic field of the primary coil;

[0041] The control module adjusts the magnetic field range of the primary coil according to the user's body feedback, and controls the magnetic field strength of the secondary coil through the control circuit, so that the magnetic field generated by the secondary coil offsets the magnetic field of the outer circle of the primary coil layer by layer, thereby realizing the regulation of the magnetic field range of the primary coil.

[0042] like Figure 2As shown in the pulse magnetic field generating circuit in, the primary coil L1 in the magnetic field generating module is an inductor composed of multiple turns of copper wire, the main circuit includes a switch S, a high-voltage power supply V, a pulse capacitor C, a diode D, a thyristor T and a resistor Rf, wherein the maximum working voltage of the pulse capacitor C is 2000V, the maximum pulse current is 5000A, and the capacitance is 140μF, the first end of the switch S is connected to the positive electrode of the power supply V, the second end of the switch S is connected to the first end of the thyristor T, the second end of the thyristor T is connected to the first end of the loop equivalent impedance structure Rf, the second end of the resistor Rf is connected to the first end of the primary coil L1, the second end of the primary coil L1 is connected to the first end of the pulse capacitor C, the second end of the pulse capacitor C is connected to the second end of the switch S, the first end of the diode D is connected to the second end of the pulse capacitor C, and the second end of the diode D is connected to the first end of the resistor Rf;

[0043] The primary coil is disconnected after the pulse capacitor C is charged to a predetermined voltage through a high-voltage V power supply, and the control module controls the thyristor T to discharge the primary coil L1, thereby generating a pulse magnetic field; the magnetic stimulation intensity of the primary coil decreases layer by layer from the inner circle to the outer circle.

[0044] In the above technical solution, by controlling the discharge process of the main circuit to the primary coil, the energy stored in the circuit can be efficiently released to the primary coil in the form of pulses, thereby generating a strong pulse magnetic field; since the charging voltage and discharge process of the pulse capacitor are controllable, the intensity of the magnetic stimulation generated by the primary coil can be accurately adjusted to meet the needs of different application scenarios.

[0045] The secondary coil in the adjustable magnetic field module is an inductor composed of multiple turns of copper wire. When the current in the primary coil L1 changes, the secondary coil L2 generates an induced current according to Faraday's law of electromagnetic induction. According to Lenz's law, the direction of the induced current is opposite to the current in the primary coil L1. The relationship between the induced current in the secondary coil L2 and the induced current in the primary coil L1 is:

[0046]

[0047] where i 2 is the induced current in the secondary coil, i 1 is the current in the primary coil, r 2 is the resistance of the secondary coil, L s2 is the inductance of the secondary coil, M is the mutual inductance between the primary coil and the secondary coil, and jw is the angular frequency of the alternating current; according to the above formula, in the case of low frequency, r 2 >>jwL s2 , indicating that the resistance of the secondary coil is much greater than the inductance, so the inductance term in the above formula can be ignored; the induced current in the secondary coil is simplified to It means that under low frequency conditions, the induced current in the secondary coil is mainly determined by the resistance in the secondary coil and the current in the primary coil; the induced current i 2 The current i in the primary coil L1 1 Therefore, by adjusting the current in the secondary coil, the distribution range of the magnetic field of the primary coil can be changed.

[0048] like Figure 2 As shown in the secondary coil magnetic field control circuit in the adjustable magnetic field module, the control circuit in the adjustable magnetic field module is used to control the current path and magnetic field strength of the secondary coil, including bidirectional thyristors T1 and T2, load resistor Rf1, energy storage capacitor C1, current limiting resistor Rc, backup high voltage power supply V1, two control switches S1 and S2, wherein the load resistor Rf1 is the equivalent impedance of C1-T1-T2-S1, and the current limiting resistor Rc is used to limit the current of the backup high voltage power supply V1 through the energy storage capacitor C1; the first end of the secondary coil L2 is connected to the first end of the bidirectional thyristor T1, the second end of the secondary coil L2 is connected to the first end of the bidirectional thyristor T2, and the first end of the bidirectional thyristor T1 is connected to the second end of the bidirectional thyristor T2. The two ends are connected to the first end of the load resistor Rf1, the second end of the load resistor Rf1 is connected to the first end of the energy storage capacitor C1, the second end of the energy storage capacitor C1 is connected to the second end of the bidirectional thyristor T2, the first end of the control switch S1 is connected to the second end of the load resistor Rf1, the second end of the control switch S1 is connected to the second end of the bidirectional thyristor T2, the first end of the energy storage capacitor C1 is connected to the first end of the current limiting resistor Rc, the second end of the energy storage capacitor C1 is connected to the negative electrode of the backup high-voltage power supply V1, the first end of the control switch S2 is connected to the second end of the current limiting resistor Rc, and the second end of the control switch S2 is connected to the positive electrode of the backup high-voltage power supply V1.

[0049] In the above technical solution, through the control of the regulating circuit, the secondary coil can generate a magnetic field with an adjustable strength and a direction opposite to the magnetic field of the primary coil, thereby realizing precise adjustment of the magnetic field strength of the primary coil; by adjusting the magnetic field generated by the secondary coil, the application range of magnetic stimulation can be further expanded, and the intensity of magnetic stimulation can be reduced to alleviate patient discomfort.

[0050] The control module includes a main control board unit, a single-chip computer unit, a detection unit, a magnetic field strength calculation unit, a magnetic field strength control unit, and a regulation unit. The main control board unit provides an input interface for inputting corresponding control instructions according to the user's somatosensory feedback. The detection unit is used to monitor the current and magnetic field strength of the primary coil and the secondary coil L2 in real time, and feed the data back to the single-chip computer unit; the single-chip computer unit is used to receive the control instructions input by the user and determine whether to adjust the magnetic field strength or the range of action of the magnetic field according to the detection results of the detection unit.

[0051] The magnetic field strength calculation unit is used to calculate the magnetic induction intensity generated by the primary coil L1 and the secondary coil L2; when the primary coil L1 generates an excitation current i 1 When the secondary coil L2 generates an induced current i due to the mutual inductance characteristics 2 , the induced current i 2 With the excitation current i 1 The relationship is:

[0052]

[0053] Where N 1 and N 2 are the number of turns of the primary coil L1 and the secondary coil L2 respectively;

[0054] At this time, the magnetic induction intensity generated by the secondary coil is B 2 :

[0055]

[0056] where μ 2 is the magnetic permeability of the secondary coil L2, L e2 is the magnetic path length of the secondary coil L2;

[0057] The magnetic induction intensity of the primary coil is B 1 :

[0058]

[0059] where μ 1 is the magnetic permeability of the primary coil L1, L e1 is the magnetic path length of the primary coil L1.

[0060] The magnetic field strength control unit obtains the magnetic induction strength B of the primary coil L1 and the secondary coil L2 through the magnetic field strength calculation unit. 1 and B 2 , and the suppressed magnetic induction intensity value B = B 1 -B 2 ; By controlling the excitation current of the secondary coil L2, the magnetic induction intensity B 2 The enhancement and weakening of i is realized by controlling the charging and discharging of the secondary coil L2 by the energy storage capacitor C1. 2 The current size and direction change, when i 2 The direction of current and i 1 When in the same direction, the magnetic field strength increases, expressed as B=B1+B2.

[0061] The control unit adjusts the interference magnetic field of the secondary coil by controlling the main circuit and the control circuit; when the secondary coil L2 does not generate an induced current, a pre-charging operation is performed: the primary coil L1 pre-charges the energy storage capacitor C1 through the magnetic field generated by it, and the secondary coil L2 synchronously controls the backup high-voltage power supply V1 to pre-charge the energy storage capacitor C1. When the voltage of the energy storage capacitor C1 reaches the set voltage value, the switch S2 is disconnected to stop the pre-charging operation; when the secondary coil L2 generates an induced current, the magnetic field adjustment stage is entered: the direction of the current in the secondary coil L2 is adjusted by controlling the conduction polarity of the bidirectional thyristor T1 and T2. The direction and size of the interference magnetic field generated by the secondary coil L2 can be changed, thereby changing the intensity of the interference magnetic field generated by the secondary coil L2; when the control switch S1 is disconnected, the induced current generated by the primary coil L1 charges the energy storage capacitor C1 again. At this time, an oscillation circuit is formed between the primary coil L1 and the energy storage capacitor C1. Since the final state of the oscillation circuit tends to be stable, the magnetic field intensity of the secondary coil L2 is controlled by adjusting the predetermined voltage value of the energy storage capacitor C1. The more charge accumulated by the energy storage capacitor C1 in the pre-charging stage, the stronger the magnetic field interference can be generated during the magnetic field regulation. Conversely, the lower the predetermined voltage value, the weaker the magnetic field interference generated.

[0062] In the above technical solution, the control module realizes intelligent control of the entire system through a single-chip microcomputer, and can automatically adjust the magnetic field strength and range according to the user's physical feedback and real-time monitoring data; through the magnetic field strength calculation unit, the magnetic induction intensity generated by the primary coil and the secondary coil can be accurately calculated to provide accurate data support for adjusting the magnetic field strength and range; the magnetic field strength control unit realizes dynamic adjustment of the magnetic field strength by controlling the induced current of the secondary coil and the charging and discharging process of the energy storage capacitor according to the calculated magnetic induction intensity value; by accurately calculating and dynamically adjusting the magnetic field strength, the effect of magnetic stimulation can be further optimized, the accuracy of magnetic stimulation can be improved, and the discomfort during magnetic stimulation can be reduced.

[0063] Specific implementation process of the system: A patient is preparing to receive pelvic floor magnetic stimulation treatment. First, the doctor sets the required magnetic stimulation area and intensity according to the patient's condition and enters the relevant control instructions into the main control board. After the setting is completed, the single-chip microcomputer unit receives the instruction and controls the high-voltage power supply V to charge the pulse capacitor C to the predetermined voltage of 2000V.

[0064] Primary coil working stage:

[0065] By controlling the switch of the thyristor T, the primary coil L1 is discharged to generate a pulsed magnetic field, which will cover the entire pelvic floor area, but may exceed the range required for treatment. At this stage, the control switch S1 is closed, and the secondary coil L2 has not started working. The doctor asks the patient about the feeling of magnetic stimulation and determines whether the stimulation area or intensity needs to be adjusted.

[0066] Secondary coil adjustment stage:

[0067] If the patient needs a more precise stimulation area or a lower stimulation intensity, the doctor will send a command through the main control board unit to start the work of the secondary coil L2: At this time, the backup high-voltage power supply V1 pre-charges the energy storage capacitor C1 to prepare for the induced current of the secondary coil L2. The magnetic field generated by the primary coil L1 generates an induced current in the secondary coil L2. The direction of this induced current is opposite to the current direction in the primary coil L1, thereby generating a magnetic field opposite to the magnetic field of the primary coil.

[0068] The magnetic field strength calculation unit calculates the magnetic induction strengths B1 and B2 generated by the primary coil L1 and the secondary coil L2 in real time; the magnetic field strength control unit adjusts the strength of the interference magnetic field generated by the secondary coil L2 by controlling the conduction polarity of the bidirectional thyristors T1 and T2 according to the difference between B1 and B2, so that B2 offsets the outer circle magnetic field of B1 layer by layer, thereby realizing precise control of the magnetic field range of the primary coil L1;

[0069] Testing and adjustment phase:

[0070] The detection circuit will monitor the current and magnetic field strength of the secondary coil L2 in real time, and feed the data back to the single-chip microcomputer unit. The single-chip microcomputer unit will determine whether the magnetic field strength or magnetic field area needs to be further adjusted based on the detection results. If adjustment is required, the single-chip microcomputer unit will send instructions again to adjust the current and magnetic field strength of the secondary coil L2. When the expected magnetic stimulation effect is achieved, the doctor will end the treatment process through the main control board unit. At this time, the system enters the secondary coil adjustment function shutdown stage, and all devices return to their initial state.

[0071] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic stimulation system with controllable stimulation area, characterized in that: The system includes a magnetic field generating module, an adjustable magnetic field module, and a control module; The magnetic field generating module is a pulse magnetic field generating circuit formed by connecting a main circuit and a primary coil. By controlling the discharge process of the main circuit to the primary coil, the energy stored in the circuit is released to the primary coil in the form of pulses, thereby generating a pulse magnetic field. The adjustable magnetic field module is provided with a secondary coil outside the primary coil and connected to a corresponding control circuit. Under the control of the control circuit, the secondary coil generates a magnetic field with an adjustable intensity and opposite direction to the magnetic field of the primary coil; The control module adjusts the magnetic field range of the primary coil according to the user's body feedback, and controls the magnetic field strength of the secondary coil through the control circuit, so that the magnetic field generated by the secondary coil offsets the magnetic field of the outer circle of the primary coil layer by layer, thereby realizing the regulation of the magnetic field range of the primary coil.

2. A magnetic stimulation system with controllable stimulation area according to claim 1, characterized in that: The primary coil L1 in the magnetic field generating module is an inductor composed of multiple turns of copper wire, and the main circuit includes a switch S, a high-voltage power supply V, a pulse capacitor C, a diode D, a thyristor T and a resistor Rf, wherein the first end of the switch S is connected to the positive electrode of the power supply V, the second end of the switch S is connected to the first end of the thyristor T, the second end of the thyristor T is connected to the first end of the loop equivalent impedance structure Rf, the second end of the resistor Rf is connected to the first end of the primary coil L1, the second end of the primary coil L1 is connected to the first end of the pulse capacitor C, the second end of the pulse capacitor C is connected to the second end of the switch S, the first end of the diode D is connected to the second end of the pulse capacitor C, and the second end of the diode D is connected to the first end of the resistor Rf; The primary coil is disconnected after the pulse capacitor C is charged to a predetermined voltage through a high-voltage V power supply, and the control module controls the thyristor T to discharge the primary coil L1, thereby generating a pulse magnetic field; the magnetic stimulation intensity of the primary coil decreases layer by layer from the inner circle to the outer circle.

3. A magnetic stimulation system with controllable stimulation area according to claim 1, characterized in that: The secondary coil in the adjustable magnetic field module is an inductor composed of multiple turns of copper wire. When the current in the primary coil L1 changes, the secondary coil L2 generates an induced current according to Faraday's law of electromagnetic induction. According to Lenz's law, the direction of the induced current is opposite to the current in the primary coil L1. The relationship between the induced current in the secondary coil L2 and the current in the primary coil L1 is: Where i2 is the induced current in the secondary coil, i1 is the current in the primary coil, r2 is the resistance of the secondary coil, L s2 is the inductance of the secondary coil, M is the mutual inductance between the primary coil and the secondary coil, and jw is the angular frequency of the alternating current; according to the above formula, at low frequencies, the resistance of the secondary coil is much greater than the inductance, so the inductance term in the above formula can be ignored; the induced current in the secondary coil is simplified to It means that under low frequency conditions, the induced current in the secondary coil is mainly determined by the resistance in the secondary coil and the current in the primary coil; the induced current i2 is proportional to the current i1 in the primary coil L1, so the control of the magnetic field distribution range of the primary coil can be changed by adjusting the current in the secondary coil.

4. A magnetic stimulation system with controllable stimulation area according to claim 1, characterized in that: The control circuit in the adjustable magnetic field module includes bidirectional thyristors T1 and T2, a load resistor Rf1, an energy storage capacitor C1, a current limiting resistor Rc, a backup high-voltage power supply V1, and two control switches S1 and S2, wherein the current limiting resistor Rc is used to limit the current of the backup high-voltage power supply V1 through the energy storage capacitor C1; the first end of the secondary coil L2 is connected to the first end of the bidirectional thyristor T1, the second end of the secondary coil L2 is connected to the first end of the bidirectional thyristor T2, the second end of the bidirectional thyristor T1 is connected to the first end of the load resistor Rf1, and the second end of the load resistor Rf1 is connected to the first end of the bidirectional thyristor T2. A first end of the energy storage capacitor C1 is connected, a second end of the energy storage capacitor C1 is connected to a second end of the bidirectional thyristor T2, a first end of the control switch S1 is connected to a second end of the load resistor Rf1, a second end of the control switch S1 is connected to a second end of the bidirectional thyristor T2, a first end of the energy storage capacitor C1 is connected to a first end of a current limiting resistor Rc, a second end of the energy storage capacitor C1 is connected to a negative electrode of a backup high-voltage power supply V1, a first end of the control switch S2 is connected to a second end of the current limiting resistor Rc, and a second end of the control switch S2 is connected to a positive electrode of the backup high-voltage power supply V1.

5. The magnetic stimulation system with controllable stimulation area according to claim 1, characterized in that: The control module includes a main control board unit, a single-chip computer unit, and a detection unit. The main control board unit provides an input interface for inputting corresponding control instructions according to the user's somatosensory feedback. The detection unit is used to monitor the current and magnetic field strength of the primary coil L1 and the secondary coil L2 in real time, and feed the data back to the single-chip computer unit; the single-chip computer unit is used to receive the control instructions input by the user and the detection results of the detection unit, and adjust the magnetic field strength and the range of action of the magnetic field by controlling the control circuit.

6. A magnetic stimulation system with controllable stimulation area according to claim 5, characterized in that: The control module further includes a magnetic field strength calculation unit for calculating the magnetic induction strength generated by the primary coil L1 and the secondary coil L2; when the primary coil L1 generates an excitation current i1, the secondary coil L2 generates an induced current i2 due to the mutual inductance characteristics, and the relationship between the induced current i2 and the excitation current i1 is: Where N1 and N2 are the number of turns of the primary coil L1 and the secondary coil L2 respectively; At this time, the magnetic induction intensity generated by the secondary coil is B2: Where μ2 is the magnetic permeability of the secondary coil L2, L e2 is the magnetic path length of the secondary coil L2; The magnetic induction intensity of the primary coil is B1: Where μ1 is the magnetic permeability of the primary coil L1, L e1 is the magnetic path length of the primary coil L1.

7. A magnetic stimulation system with controllable stimulation area according to claim 5, characterized in that: The control module also includes a magnetic field strength control unit, which obtains the magnetic induction intensities B1 and B2 of the primary coil L1 and the secondary coil L2 through a magnetic field strength calculation unit, and obtains a suppressed magnetic induction intensity value B=B1-B2; the magnetic induction intensity B2 is enhanced and weakened by controlling the excitation current of the secondary coil L2; the charge and discharge of the secondary coil L2 is controlled by the energy storage capacitor C1, so as to realize the change of the current size and direction of i2. When the current direction of i2 is the same as that of i1, the magnetic field strength is enhanced, which is expressed as B=B1+B2.

8. The magnetic stimulation system with controllable stimulation area according to claim 5, characterized in that: The control module also includes a control unit, which adjusts the interference magnetic field of the secondary coil by controlling the main circuit and the control circuit; when the secondary coil L2 does not generate an induced current, a pre-charging operation is performed: the primary coil L1 pre-charges the energy storage capacitor C1 through the magnetic field generated by it, and the secondary coil L2 synchronously controls the backup high-voltage power supply V1 to pre-charge the energy storage capacitor C1. When the voltage of the energy storage capacitor C1 reaches a set voltage value, the switch S2 is disconnected to stop the pre-charging operation; when the secondary coil L2 generates an induced current, it enters a magnetic field adjustment stage: the intensity of the interference magnetic field generated by the secondary coil L2 is adjusted by controlling the conduction polarity of the bidirectional thyristors T1 and T2. When the control switch S1 is disconnected, the induced current generated by the primary coil L1 charges the energy storage capacitor C1 again, and the primary coil L1 and the energy storage capacitor C1 form an oscillation circuit. At this time, the magnetic field intensity of the secondary coil L2 is controlled by adjusting the predetermined voltage value of the energy storage capacitor C1.

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