Magnetic stimulation device and method

Abstract

This invention relates to a novel magnetic stimulation device and method with optimized energy utilization and improved performance, comprising: a magnetic field generating device, a first energy storage device and a second energy storage device, the magnetic field generating device, the first energy storage device and the second energy storage device being connected in series to form an electrical oscillation resonant circuit; an energy source coupled to the first energy storage device; and a switch for allowing charging of the first energy storage device from the energy source and initiating electrical oscillation of the resonant circuit, wherein, after the electrical oscillation is initiated, due to the electrical oscillation of the resonant circuit, the two energy storage devices repeatedly exchange charges through the magnetic field generating device, generating a time-varying magnetic field. This time-varying magnetic field induces an electric current in biological tissue, thereby stimulating the biological tissue.

Description

Technical Field

[0001] This invention relates to an apparatus and method for generating magnetic stimulation to stimulate biological tissues. Background Technology

[0002] Magnetic stimulation is a method of stimulating cells by applying an external, time-varying magnetic field. This field induces electrical currents in the intracellular and extracellular spaces, causing depolarization of the cell membrane and triggering action potentials. External, time-varying magnetic fields can stimulate different types of cells, including nerve cells in the central and peripheral nervous systems, as well as muscle cells. The effects on physiological and biological responses vary depending on the properties of the magnetic field, allowing for its widespread application in humans and animals for both treatment and research purposes. This method is non-invasive, contactless, sterile, painless, and suitable for stimulating deep tissue structures because the magnetic field can penetrate tissue. Due to these important advantages, magnetic stimulation has been developed into a valuable tool for treatment and research purposes, with widespread applications in various clinical and scientific fields.

[0003] The time-varying magnetic field is generated by a device in which existing magnetic stimulation devices typically include an electrical energy source, a capacitor charged by the energy source, a coil, and a switch that allows the capacitor to be charged from the energy source and allows the capacitor to discharge through the coil in the form of high-amplitude, short-duration current pulses. As the current pulses pass through the coil, a time-varying magnetic field is generated by the coil, and the peak magnetic flux density can reach several Tesla. Due to the short duration of the current pulses, the instantaneous value of the current can reach several thousand amperes. One way to classify magnetic stimulation devices is by the waveform of the current pulses flowing through the coils, which reflects the change in current amplitude over time. The most common types are: polyphase pulses, consisting of the positive and negative half-cycles of a multi-period damped sine wave; monophase pulses, rising rapidly from zero to a peak value and then slowly falling back to zero; biphase pulses, consisting of the positive and negative half-cycles of a single-period damped sine wave; half-sine pulses, consisting of the positive half-cycle of a sine wave; and paired or dual pulses, consisting of two polyphase pulses, two monophase pulses, two biphase pulses, or two half-sine pulses separated by selectable time intervals and with independently selectable amplitudes. Another key aspect of the performance of a magnetic stimulation device is the capacitor voltage drop between the start and end of each pulse, attributed to losses caused by ohmic resistance. If the voltage drop is not compensated, a higher voltage drop will result in a lower voltage at the start of the next pulse, leading to a smaller current pulse amplitude and a slower rate of change, thus weakening the stimulation. If the voltage drop is compensated by an energy source to ensure that the next pulse is identical to the previous one, then the higher the voltage drop, the longer it takes for the energy source to compensate for it. This is because the energy source charges the capacitor at a specific rate based on its current output, and the time required to compensate for the voltage drop is a limiting factor for the minimum time interval between consecutive pulses of the same amplitude, or, if expressed in the frequency domain, for the maximum pulse repetition rate of the magnetic stimulation device. If the voltage drop is normalized to the operating voltage and expressed as a percentage, it is an inherent characteristic of the magnetic stimulation device. Existing devices therefore include a recovery circuit that allows partial recovery of the capacitor's initial voltage to limit the voltage drop. Therefore, considering that the absorbed energy required for stimulation is a tiny fraction of the total pulse energy, and that tissue stimulation contributes very little to the voltage drop, optimizing the design of the magnetic stimulator requires minimizing losses due to ohmic resistance and maximizing the voltage recovery rate.

[0004] Existing devices and methods offer limitations in efficiency and performance. These limitations arise when a reverse voltage is applied to the output of the energy source, requiring a protection circuit, which increases losses due to additional ohmic resistance and necessitates higher component ratings within the energy source, leading to higher switching and conduction losses. Another drawback is that reverse charging of the capacitor increases its voltage rating, size, and cost. Furthermore, reverse charging of the capacitor nearly doubles the peak-to-peak operating voltage of the device, reducing device safety and requiring additional electrical safety measures. On the other hand, including the excitation coil in the capacitor charging circuit limits the current flow through the coil during the capacitor charging phase due to additional losses caused by the coil's ohmic resistance, generating unnecessary additional coil heating and increasing coil cooling requirements. The need for a protection circuit for the energy source is reduced but still exists, and a magnetic field with unusual characteristics and unexplored effects in tissue magnetic stimulation is emitted during charging. In other cases, device designs incorporate voltage recovery methods to improve efficiency, but this is only achieved to a limited extent and at the cost of increased complexity and cost due to the need for additional operating switches, which in turn introduce additional ohmic resistance losses. The operating switches and protection circuits used in magnetic stimulators, with typical ratings, introduce ohmic resistance in the tens of milliohms range, which contributes more to the percentage of voltage drop than other components of the magnetic stimulator, such as connecting cables. Existing devices use coils of various shapes, sizes, and orientations, which generate heat due to the high current. To meet the requirements of providing different pulse shapes and stimulation modes, the circuit design of the device becomes increasingly complex, accompanied by higher losses due to higher ohmic resistance, and increased requirements for synchronization of the operation of different components.

[0005] Based on the analysis of existing technologies, there is a need for improved magnetic stimulation devices and methods that are not limited by the shortcomings of existing technologies. Summary of the Invention

[0006] This invention relates to a novel magnetic stimulation device and method with optimized energy utilization and improved performance. The magnetic stimulation device includes: a magnetic field generating device, a first energy storage device, and a second energy storage device, the magnetic field generating device, the first energy storage device, and the second energy storage device being connected in series to form an electrically oscillating resonant circuit; an energy source coupled to the first energy storage device; and a switch for allowing charging of the first energy storage device from the energy source and initiating electrical oscillation of the resonant circuit. After initiation of electrical oscillation, the two energy storage devices repeatedly exchange charges through the magnetic field generating device due to the electrical oscillation of the resonant circuit, generating a time-varying magnetic field. This circuit can be described as the basic circuit of this invention. The time-varying magnetic field induces a current in biological tissue, thereby stimulating the biological tissue. When the switch is open, the energy source charges the first energy storage device, and once the switch is closed, the electrical oscillation of the resonant circuit is initiated. At no time is a reverse voltage applied to the output of the energy source, and the two energy storage devices are never reverse-charged.

[0007] The voltage between the terminals of each of the two energy storage devices always has the same polarity.

[0008] During the charging of the first energy storage device from the energy source, no current flows through the magnetic field generating device.

[0009] Without the use of electrical protection devices, the energy source is protected from reverse voltage polarity.

[0010] After the electric oscillation of the resonant circuit is started, the two energy storage devices repeatedly exchange charges without the need to operate any switches.

[0011] Furthermore, the first energy storage device is coupled to the energy source, with the conductor length being as short as possible and no electrical protection devices between them, thus helping to minimize losses during charging and making the device safer. During electrical oscillations, charge is repeatedly exchanged between the two energy storage devices via a magnetic field generator without any switching operations that would increase complexity and ohmic resistance losses, providing efficient voltage recovery.

[0012] In this invention, by adding the function of opening and closing at selectable time points to stop the electrical oscillation of the resonant circuit to the switch of the basic circuit, the resonant circuit can generate different current pulse waveforms, wherein due to the circuit simplification, efficient voltage recovery and minimal loss caused by minimal ohmic resistance, the voltage drop percentage is low and the pulse repetition rate is high.

[0013] Compared to a basic circuit used to generate paired or double pulses, this invention addresses the disadvantages of current flowing through the magnetic field generating device during the charging of the second energy storage device from the energy source, and the advantage of requiring fewer switches compared to a basic circuit. This is achieved by positioning the switches in the basic circuit to allow charging of the second energy storage device from the energy source, rather than the first, and to initiate electrical oscillations in the resonant circuit. In other words, in this invention, the switch positions are adapted to allow charging of the second energy storage device from the energy source and to initiate electrical oscillations in the resonant circuit.

[0014] By adding a series-connected resistor and a second switch to the basic circuit with added switching functionality, and connecting the series-connected resistor and the second switch in parallel with a second energy storage device to selectively discharge either or both of the two energy storage devices, the present invention further improves performance and provides the highest efficiency and performance for generating multiphase and two-phase current pulses.

[0015] By further adding a third switch and a second resistor connected in series to a basic circuit that includes a switching function and a selective discharge function, and by connecting the third switch and the second resistor in parallel with the first switch and the magnetic field generating device connected in series, the present invention provides the highest efficiency and performance for generating single-phase current pulses.

[0016] By further adding a third switch and a second magnetic field generating device connected in series to a basic circuit that includes a switching function and a selective discharge function, and by connecting the third switch and the second magnetic field generating device in series in parallel with the first switch and the first magnetic field generating device connected in series, the present invention provides the highest efficiency and performance for generating half-sinusoidal current pulses.

[0017] By further adding a series-connected third switch and second resistor, as well as a series-connected fourth switch and second magnetic field generating device to a basic circuit that includes a switching function and a selective discharge function, wherein the series-connected third switch and second resistor, as well as the series-connected fourth switch and second magnetic field generating device are connected in parallel with the series-connected first switch and first magnetic field generating device, the present invention provides the highest efficiency and performance for generating multiphase current pulses, two-phase current pulses, single-phase current pulses, and half-sinusoidal current pulses, as well as any combination of these current pulses, with the lowest complexity requiring a minimum number of four switches and minimizing losses due to ohmic resistance and synchronization requirements.

[0018] By further adding the following components to a basic circuit that includes a switching function and a selective discharge function: a third energy storage device and a third switch connected in series, the third energy storage device and the third switch being connected in parallel with a magnetic field generating device and a second energy storage device connected in series, wherein the third energy storage device is further coupled to an energy source; and a fourth switch and a fifth switch for allowing the energy source to selectively charge only the first energy storage device, or only the third energy storage device, or both, the present invention provides the possibility of generating pairs of current pulses of the same or different types, or high-amplitude single pulses of any type. The amplitude of each of a pair of current pulses can be independently adjusted via the fourth and fifth switches, and the time interval between a pair of current pulses can also be independently adjusted to any value via the first and third switches. The higher-amplitude single pulse is a higher-amplitude pulse generated by the combination of the first and third energy storage devices.

[0019] The present invention can further reduce losses caused by ohmic resistance by placing the energy storage device inside a housing, because the length of the connecting conductor of the circuit is shortened.

[0020] According to the present invention, each energy storage device may include at least one capacitor, wherein the capacitances of the energy storage devices are preferably equal, because for equal capacitances, energy transfer and voltage recovery between energy storage devices during oscillation can be maximized.

[0021] By enabling independent selection of the capacitance of each energy storage device, the present invention provides the possibility of selectively adjusting the duration of a current pulse when the capacitance of the energy storage device changes and becomes equal after the change; and the possibility of selectively adjusting the voltage transfer ratio between energy storage devices during oscillation when the capacitance of the energy storage devices changes and becomes unequal after the change.

[0022] By further adding multiple switches and magnetic field generating devices to the basic circuit, wherein each switch is connected in series with a magnetic field generating device to form a series branch, and all series branches are connected in parallel with each other and in parallel with the series branch of the first switch and the first magnetic field generating device, the present invention provides the possibility of selectively activating the same or different magnetic field generating devices simultaneously or not simultaneously in the basic resonant circuit. This facilitates the application of magnetic stimulation to larger or different areas in a shorter time when more than one magnetic field generating device is applied simultaneously in a certain area, using magnetic field generating devices of different shapes, sizes, orientations and focal points, or using more complex orientations and focal points.

[0023] By further adding multiple electric oscillating resonant circuits to the basic circuit, each electric oscillating resonant circuit is composed of two energy storage devices, a switch and a magnetic field generating device connected in series. In each electric oscillating resonant circuit, one of the two energy storage devices is coupled to the energy source and other electric oscillating resonant circuits by the switch. This invention provides the possibility of selectively generating mutually independent time-varying magnetic fields simultaneously or not simultaneously.

[0024] By further adding a control unit for controlling the energy source and the switch, the present invention provides the possibility of continuously adjusting and modulating the output of the energy source, the amplitude of the current pulse, the repetition rate of the current pulse, and the type of the current pulse, wherein the current pulse includes a current pulse flowing through the magnetic field generating device.

[0025] This invention is used in biological tissues, wherein a time-varying field induces an electric current in the biological tissues.

[0026] According to the present invention, a method for generating magnetic stimulation in tissue is provided, the method comprising: providing an energy source; charging an energy storage device connected in series with a magnetic field generating device and another energy storage device to form an electrical oscillation resonant circuit; and allowing the resonant circuit to oscillate electrically to generate a current flowing through the magnetic field generating device, thereby generating a time-varying magnetic field that induces a current in the tissue.

[0027] According to another aspect of the method of the present invention, the method includes the following steps: providing an energy source; charging an energy storage device connected in series with a magnetic field generating device to form an electric oscillating resonant circuit; connecting a second energy storage device in series with the first energy storage device and the magnetic field generating device connected in series to form a new electric oscillating resonant circuit; and allowing the new resonant circuit to oscillate electrically to generate a current flowing through the magnetic field generating device, thereby generating a time-varying magnetic field that induces a current in tissue. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an embodiment of a magnetic stimulator, which includes: a magnetic field generating device, a first energy storage device, and a second energy storage device connected in series, wherein the capacitances of the two energy storage devices are equal; an energy source connected in parallel with the first energy storage device; and a switch connected in series between the first energy storage device and the magnetic field generating device, and included in the same branch of the circuit as the magnetic field generating device.

[0029] Figures 2A to 2C It is through the use of Figure 1 The schematic graphs of the voltages of the two energy storage devices and the current of the magnetic field generating device generated by the implementation method show multiphase pulses, biphase pulses and half-sine pulses, respectively.

[0030] Figure 3 It shows the Figure 1 The embodiment shown is modified in that the position of the switch is changed to be connected in series between the two energy storage devices and included in the same branch of the circuit with the second energy storage device.

[0031] Figure 4 It shows the Figure 1 Another modification of the embodiment shown is that the position of the switch is modified to be connected in series between the first energy storage device and the magnetic field generating device, and is included in the same branch of the circuit as the first energy storage device.

[0032] Figure 5 This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 1 The embodiment further includes a resistor and a second switch connected in series, and the resistor and the second switch connected in series are connected in parallel with the second energy storage device.

[0033] Figures 6A to 6D It is through the use of Figure 5 The schematic graphs of the voltages of the two energy storage devices and the current of the magnetic field generating device generated by the implementation method show two multiphase pulses, two biphase pulses, two half-sine pulses and two single-phase pulses, respectively.

[0034] Figure 7 This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 5 The embodiment further includes a third switch and a second resistor connected in series, and the third switch and the second resistor connected in series are connected in parallel with the first switch and the magnetic field generating device connected in series.

[0035] Figure 8 It is through the use of Figure 7 The schematic graphs of the voltages of the two energy storage devices and the current of the magnetic field generating device generated by the implementation method show two single-phase pulses.

[0036] Figure 9 This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 5 The embodiment further includes a third switch and a second magnetic field generating device connected in series, and the third switch and the second magnetic field generating device connected in series are connected in parallel with the first switch and the first magnetic field generating device connected in series.

[0037] Figure 10 It is through the use of Figure 9 The schematic graphs generated by the implementation method, showing the voltage of the two energy storage devices, the current of the first magnetic field generating device, and the current of the second magnetic field generating device, illustrate two half-sine pulses flowing through the first magnetic field generating device.

[0038] Figure 11This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 5 The embodiment further includes a third switch and a second resistor connected in series, as well as a fourth switch and a second magnetic field generating device connected in series, wherein the third switch and the second resistor connected in series, as well as the fourth switch and the second magnetic field generating device connected in series, are connected in parallel with the first switch and the first magnetic field generating device connected in series.

[0039] Figure 12 This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 5 The implementation further includes: a third energy storage device and a third switch connected in series; a third magnetic field generating device and a third switch connected in series and connected in parallel with the magnetic field generating device and the second energy storage device connected in series; a fourth switch coupled between the energy source and the first energy storage device; and a fifth switch coupled between the energy source and the third energy storage device.

[0040] Figure 13 It is through the use of Figure 12 The schematic graphs of the voltages of the three energy storage devices and the current of the magnetic field generating device generated by the implementation method show two pairs of biphase pulses.

[0041] Figure 14 It is through the use of Figure 12 The schematic graphs of the voltages of the three energy storage devices and the current of the magnetic field generating device generated by the implementation method show two high-amplitude biphase single pulses.

[0042] Figure 15 This is a schematic diagram of a preferred embodiment of a magnetic stimulator, wherein the energy storage device is disposed within a housing.

[0043] Figure 16 This is a schematic graph showing the relationship between the energy transfer efficiency during the oscillation of the resonant circuit and the capacitance ratio of the two energy storage devices.

[0044] Figure 17 This is a schematic diagram of an alternative implementation of a magnetic stimulator, in which the capacitor of each energy storage device can be selected independently.

[0045] Figure 18 This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 1 The implementation further includes (n-1) switches and (n-1) magnetic field generating devices, wherein each switch is connected in series with a magnetic field generating device to form a series branch, and all series branches are connected in parallel with each other and in parallel with the series branch of the first switch and the first magnetic field generating device.

[0046] Figure 19This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 1 The implementation also includes (n-1) electric oscillating resonant circuits, each of which consists of two energy storage devices, a switch and a magnetic field generating device connected in series. In each electric oscillating resonant circuit, one of the two energy storage devices is coupled to the energy source and other electric oscillating resonant circuits by the switch.

[0047] Figure 20 This is a schematic diagram of an alternative implementation of a magnetic stimulator, which is... Figure 11 The implementation also includes a control unit for controlling the energy source and the switch to allow continuous adjustment and modulation of the output of the energy source, the amplitude of the current pulse, the repetition rate of the current pulse, and the type of the current pulse, wherein the current pulse includes a current pulse flowing through the magnetic field generating device. Detailed Implementation

[0048] This invention is based on a unique inventive concept of a magnetic stimulator having an electrical resonant circuit consisting of two energy storage devices and a magnetic field generating device connected in series. As a resonant circuit, the electric field energy stored in one energy storage device is transferred to the other energy storage device via the inductance of the magnetic field generating device. A necessary and sufficient condition for initiating oscillation is the existence of a voltage difference between the two energy storage devices. This is what distinguishes the resonant circuit of this invention from all RLC resonant circuits of other magnetic stimulators that contain only one energy storage device in their resonant circuit. The resonant circuit of this invention oscillates when a voltage difference exists between the two energy storage devices and stops oscillating when the voltages of the two energy storage devices are equal and the current in the magnetic field generating device is zero. The current always flowing through the magnetic field generating device has a reversing direction from half-cycle to half-cycle. A resonant circuit containing only one energy storage device oscillates when there is a non-zero voltage on its only energy storage device and stops oscillating when the voltage of its only energy storage device is equal to zero and the current in the magnetic field generating device is zero. A unique property of the resonant circuit of this invention is that the voltage polarity on each energy storage device always remains constant and never reverses. Another unique property of the resonant circuit of this invention is that the energy source outputs current for charging without flowing through the magnetic field generating device. Most of the equations and functions describing the underdamped response of an RLC resonant circuit also apply to the resonant circuit of this invention, where the voltage V of the capacitor in a typical RLC circuit... c The change is to the voltage difference ΔV between the two energy storage devices C2 and C3 in the resonant circuit of this invention. C =V C2 -V C3 The capacitance C of the capacitor in a typical RLC circuit is replaced by the total capacitance of the two energy storage devices C2 and C3 connected in series in the resonant circuit of this invention:

[0049]

[0050] R still represents the total resistance of the circuit, which is the sum of the ohmic resistances of the switching device, the magnetic field generating device, and the connecting cables.

[0051] The unique inventive concept of this invention provides a method for generating magnetic stimulation in tissue, which is carried out through the following steps: charging an energy storage device with an energy source; having another energy storage device and a magnetic field generating device, wherein the two energy storage devices and the magnetic field generating device are connected in series and form an electrically oscillating resonant circuit; and allowing the resonant circuit to oscillate electrically, wherein current flows from one energy storage device to the other and back through the magnetic field generating device due to the voltage difference between the two energy storage devices, generating a time-varying magnetic field around the magnetic field generating device. On the other hand, the method of this invention can be applied to existing RLC resonant circuits, wherein by connecting a second energy storage device in series with the existing energy storage device and the magnetic field generating device, a second energy storage device can be added to the existing RLC resonant circuit to form a novel resonant circuit under the unique inventive concept of this invention, so that charge is exchanged between the two energy storage devices through the magnetic field generating device, instead of charging and discharging one energy storage device of the existing RLC resonant circuit through the magnetic field generating device.

[0052] Description of Implementation

[0053] refer to Figure 1 The diagram illustrates an embodiment of a magnetic stimulator for generating multiphase, biphase, and half-sinusoidal current pulses. Figure 1 The implementation includes: a magnetic field generating device (1), a first energy storage device (2), and a second energy storage device (3), which are connected in series to form an electric resonant circuit; an energy source (4), coupled to the first energy storage device (2); and a switch (5) for allowing the first energy storage device (2) to be charged from the energy source (4) and for initiating the electric oscillation of the resonant circuit, wherein, after the electric oscillation is initiated, due to the electric oscillation of the resonant circuit, the two energy storage devices (2) and (3) repeatedly exchange charges through the magnetic field generating device (1) and generate a time-varying magnetic field. More specifically, Figure 1The resonant circuit of the embodiment includes a first energy storage device (2) with a capacitor C2, a second energy storage device (3) with a capacitor C3, and a magnetic field generating device (1) with an inductance L1 connected in series, wherein, for example, the capacitor C3 is equal to the capacitor C2. An example of an energy storage device is a capacitor. An example of a magnetic field generating device is a coil. An energy source (4) is connected in parallel with the first energy storage device (2). A switch (5) is connected in series between the first energy storage device (2) and the magnetic field generating device (1), and is included in the same branch of the circuit together with the magnetic field generating device (1). The switch (5) can be implemented with any kind of switching element or combination thereof, such as a thyristor, diode, IGBT, MOSFET, JFET, BJT. Other switching elements that are consistent with the spirit of the invention may also be used. The above embodiments contain the minimum components required to make the invention functional. Other known materials commonly used in magnetic stimulators may be added to any embodiment of the invention, but they are not necessary and are not only unrelated to the subject matter of the invention, but also do not modify the subject matter of the invention in any way. Illustratively, in addition to the coil housed within the coil housing—which is flexibly adjustable to fit the package—complementary components may include articulated support arms for the coil housing, a coil cooling system utilizing airflow or fluid media or other cooling technologies, and interchangeable coils of different shapes, sizes, and orientations, each enclosed within its own housing. When the positions of the switch (5) and the magnetic field generating device (1) are interchanged, a magnetic field is generated. Figure 1 Equivalent alternative implementations with the same features, operation, and performance as the embodiments shown. Figure 1 The implementation method can generate different types of current pulses, not limited to common types, and is also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points of opening and closing of the switch (5) accordingly. Initially, the switch (5) is open, and the energy source (4) begins to charge the first energy storage device (2) with a directly selectable voltage value V. C2 The second energy storage device (3) was not charged, V C3 =0V, and because switch (5) is open, its voltage remains zero during the charging phase of the first energy storage device (2). Upon reaching the selected V C2 Afterwards, switch (5) closes, and the voltage difference between the two energy storage devices forces the oscillation to start, which drives current from the first energy storage device (2) through the magnetic field generating device (1) to the second energy storage device (3). During the first T / 4 period, the current increases until it reaches its positive peak value and generates a time-varying magnetic field around the magnetic field generating device (1) until the voltages of the two energy storage devices become equal and the value is V. C2 / 2. In the second T / 4, the magnetic field weakens with time, and an electromotive force is induced according to Faraday's law:

[0054]

[0055] This drives the current to flow continuously from its positive peak to zero until the end of the first half-cycle. Due to losses attributable to the ohmic resistance, at the end of the first half-cycle, the voltage V... C2 The voltage obtained by subtracting the minimum voltage decrease charges the second energy storage device (3), while the first energy storage device (2) is not fully discharged but remains at a voltage increment greater than zero. Due to this new voltage difference, the two energy storage devices begin to exchange charge again in the second half-cycle in a manner similar to the first half-cycle, during which the current flows in opposite directions. At the end of the third T / 4, the voltages of the two energy storage devices are equal again. At the end of the second half-cycle, the two energy storage devices are charged almost at their initial voltages, and the first energy storage device (2) has a voltage V due to ohmic resistance losses. C2 The voltage obtained by subtracting the minimum voltage reduction is that the second energy storage device (3) has a minimum voltage increment greater than zero.

[0056] Figure 2B The voltage waveforms of the two energy storage devices (2) and (3) and the current waveform flowing through the magnetic field generating device (1) are depicted during a complete cycle. The current pulses consist of positive and negative half-cycles, with amplitudes ranging from thousands of amperes to hundreds of microseconds, and their shape is described as a one-cycle damped sine wave. Current I L1 (t) is defined as the current flowing through the magnetic field generating device (1) and is obtained by the following function:

[0057]

[0058] Where ΔVc=V C2 -V C3 a = R / 2L, ωd 2 =(LC) -1 -a 2 R, L, and C represent the total ohmic resistance, total inductance, and total capacitance of the circuit, respectively. The total ohmic resistance of the circuit is the sum of the ohmic resistances of the switching device, the magnetic field generating device, and the connecting cables. Since parasitic inductance can be ignored, the total inductance of the circuit is considered equal to L1.

[0059]

[0060] Since parasitic capacitance can be ignored, the total capacitance of the circuit can be considered equal to C. 2+3串联 :

[0061]

[0062] The underdamped natural oscillation period of the circuit is:

[0063]

[0064] in , , ,

[0065] The magnetic field generating device (1) is a component of the resonant circuit and also a stimulation device placed on the stimulation area of ​​the tissue. According to Ampere's law, the magnetic flux density B(t) of the time-varying magnetic field generated around the magnetic field generating device (1) depends on the current I flowing through the magnetic field generating device (1). L1 (t):

[0066]

[0067] The magnetic field B(t) penetrates the tissue and induces an electric field E. According to Faraday's law, this electric field is proportional to the rate of change of B(t). Since the tissue is conductive, the induced E generates a current flow in the tissue. This current flow causes cell membrane depolarization and triggers an action potential. The above analysis leads to the following conclusion: the effect on the cell membrane potential is related to the current I flowing through the magnetic field generating device (1). L1 The rate of change of (t) is proportional. Based on the fact that for all RLC resonant circuits and the resonant circuit of this invention, the values ​​of R, L, and C are considered fixed and do not fluctuate, and the period calculated from these values ​​is also considered fixed, it is deduced that in order to improve I... L1最大 and (dI) L1 / dt) 最大 According to I L1 As revealed by the (t) function, for a typical RLC resonant circuit, the multiplier V must be increased. C For the resonant circuit of this invention, the multiplier ΔV must be increased. C Furthermore, since magnetic stimulators operate using stimulation protocols that require the continuous emission of thousands of pulses, facilitating the completion of the stimulation protocol in the shortest possible time, or using stimulation protocols requiring a high pulse repetition rate to elicit different physiological responses, the key to their performance lies in their ability to emit pulses with the highest possible pulse repetition rate. For a typical RLC resonant circuit, this means that the circuit can recharge an energy storage device to V from the end of one pulse. C The speed at which the voltage (to emit the next pulse) is determined, or, for the resonant circuit of this invention, by the circuit's ability to recharge both energy storage devices to ΔV from the end of one pulse. C The voltage difference (in order to generate the next pulse) is determined by the speed at which it occurs. Between the start of a pulse and the end of the same pulse, whether for a typical RLC resonant circuit or for the resonant circuit of this invention, the voltage V changes due to the damped response. CThe drop or voltage difference ΔV C The decreases in voltage are inevitable for each. However, how to successfully recover a portion of the voltage V at the end of each emitted pulse is a key question. C or part of ΔV C This is an inherent characteristic of each circuit. Therefore, objectively speaking, the efficiency and performance of a resonant circuit can be described by the percentage of voltage drop, defined as:

[0068] For a typical RLC resonant circuit

[0069] For the resonant circuit of this invention

[0070] In the case of the resonant circuit of the present invention, it is applicable that the efficiency and performance of the circuit are directly related to the voltage difference ΔV. C It is related to, rather than to, a specific voltage value V. C2 and V C3 This is relevant, and therefore unrelated to the specific value of the electrical energy (in Joules) stored in the two energy storage devices, because the electrical energy stored in the capacitor with capacitance C is:

[0071]

[0072] On the other hand, the total ohmic resistance R of all circuits in the magnetic stimulator is also an inherent characteristic of each circuit, defined by the circuit topology and determined by the number of switching devices, the length of connecting cables, and other electrical components; all these factors contribute to an increase in R. For example, I... L1 As also disclosed in the function (t), the higher the value of R, the faster the damping, and therefore the higher the percentage of voltage drop. The effect of the total resistance R on the efficiency and performance of the resonant circuit of the magnetic stimulator is represented by its contribution to the percentage of voltage drop.

[0073] The voltage drop percentage constitutes the most objective value for comparing the efficiency and performance of different circuits in a magnetic stimulator. For effective comparison of different circuits, L, C, and the initial charging voltage must be applied with the same values. Under these conditions, for the same type of current pulse, the voltage drop percentage of each circuit accurately reflects its efficiency and performance. Conversely, the maximum pulse repetition rate, which characterizes the minimum time difference between two consecutive pulses, depends on the output current of the energy source; therefore, the maximum repetition rate is not suitable for comparing the efficiency and performance of different circuits. To further illustrate, there are examples where the power input of the energy source in a magnetic stimulator circuit is increased, resulting in a higher output current. This higher current charges the energy storage device faster, increasing the maximum repetition rate, but this is related to external factors of the circuit.

[0074] In addition to eliminating other drawbacks of the prior art, the present invention also optimizes the efficiency and performance of the magnetic stimulator. The voltage between the terminals of each of the two energy storage devices (2) and (3) always has the same polarity. During charging of the first energy storage device (2) from the energy source (4), no current flows through the magnetic field generating device (1), no electrical device protects the energy source (4) from reverse voltage polarity, and after the electrical oscillation of the resonant circuit is initiated, the two energy storage devices (2) and (3) repeatedly exchange charges without the need to operate any switches. Regarding the optimization of efficiency and performance, for example, Figure 5 and Figure 6A Diagrams showing alternative embodiments of the magnetic stimulator and the voltages V of the two energy storage devices (2) and (3) in this embodiment for continuously generating multiphase pulses with a 50% voltage drop are shown. C2 and V C3 and the current I of the magnetic field generating device (1) L1 A curve graph. For example, Figure 5 and Figure 6B Diagrams showing alternative embodiments of the magnetic stimulator and the voltages V of the two energy storage devices (2) and (3) of this embodiment for continuously generating biphasic pulses with a voltage drop percentage of less than 11% are shown respectively. C2 and V C3 and the current I of the magnetic field generating device (1) L1 A curve graph. For example, Figure 7 and Figure 8 Diagrams showing alternative embodiments of the magnetic stimulator and the voltage V of the two energy storage devices (2) and (3) in this embodiment when continuously generating single-phase pulses with a 50% voltage drop are shown. C2 and V C3 and the current I of the magnetic field generating device (1) L1 A curve graph. For example, Figure 9 and Figure 10 Diagrams showing alternative embodiments of the magnetic stimulator and the voltages V of the two energy storage devices (2) and (3) of this embodiment for continuously generating half-sine pulses with a voltage drop percentage of less than 9% are shown respectively. C2 and V C3 and the current I of the magnetic field generating device (1) L1 The curve graph. The resonant circuit of the present invention—in which the voltage difference between the two energy storage devices (2) and (3) initiates the oscillation—is different from the RLC resonant circuit of other magnetic stimulators—in which a non-zero voltage of one energy storage device initiates the oscillation—provides unique advantages to the present invention, such as Figure 5 , Figure 7 , Figure 9 , Figure 11 , Figure 12 as well as Figure 20As shown, this is achieved by adding a series-connected resistor (6) and a second switch (7), and by connecting the series-connected resistor (6) and the second switch (7) in parallel with the second energy storage device (3), and configuring them to discharge the remaining voltage of the second energy storage device (3) very quickly at the end of each pulse. The rapid discharge of the second energy storage device (3) results in ΔV C，脉冲结束 This increases the voltage drop percentage, resulting in better efficiency and performance. The residual voltage of the second energy storage device (3) at the end of each pulse in other RLC resonant circuits with an energy storage device is captured in the voltage drop of that single energy storage device at the end of each pulse, requiring it to be replenished by charging that single energy storage device, rather than being removed by discharging the second energy storage device (3) as is the case in this invention. This unique feature contributes to the higher efficiency and performance of the resonant circuit of this invention compared to RLC resonant circuits of other magnetic stimulators. Furthermore, the feature of discharging the second energy storage device (3) at the end of each pulse allows for the continuous firing of an unlimited number of consecutive pulses, because without this feature, the residual voltage of the second energy storage device (3) would accumulate at the end of each pulse, and after several pulses, the voltages of the two energy storage devices (2) and (3) would be equal, making it impossible to generate any more pulses. Another advantage of this invention is its ability to generate all different types of current pulses used in the prior art and found effective in magnetic stimulation research. Different types of current pulses include multiphase pulses, two-phase pulses, single-phase pulses, half-sine pulses, multiphase paired or double pulses, two-phase paired or double pulses, single-phase paired or double pulses, and half-sine paired or double pulses. For example... Figure 1 The described basic resonant circuit, based on the unique inventive concept of this invention, provides the possibility of generating different types of current pulses by adding a minimal number of switches and other components and with minimal complexity. The minimal number of switches is important for the efficiency and performance of the magnetic stimulator because each switch with a typical rating introduces an additional ohmic resistance in the tens of milliohms range, thus increasing the voltage drop percentage. Minimal complexity is also important for the efficiency and performance of the magnetic stimulator because fewer switches are required and the synchronization requirements for the operation of different components are lower.

[0075] refer to Figure 2A The following are examples of using... Figure 1 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1A schematic graph is provided, in which this embodiment is implemented by configuring a switch (5) to generate a multiphase pulse. The amplitude is normalized and a multiphase pulse is depicted. The time axis scale is specifically adjusted for the waveform in this graph to make it clearly visible and is different from the time scale of other graphs included in this patent. In order to generate a multiphase pulse, the switch (5) is configured to close at the beginning of each multiphase pulse and remain closed until the end of each multiphase pulse, during which time the resonant circuit oscillates freely. At the end of each multiphase pulse, the switch (5) is opened and remains open until the start of the next multiphase pulse. At the beginning of each multiphase pulse, the first energy storage device (2) is charged with an initial voltage and the second energy storage device (3) is discharged. At the end of each multiphase pulse, the remaining voltages of the two energy storage devices (2) and (3) are equal and their value is 50% of the initial voltage of the first energy storage device (2). After the switch (5) is turned off at the end of each multiphase pulse, the energy source (4) recharges the first energy storage device (2) from 50% of its initial voltage to 100%, while the remaining voltage of the second energy storage device (3) drops to zero, for example, due to its internal resistance. The stimulation intensity can be adjusted by selectively adjusting the voltage amplitude of the first energy storage device (2) before the start of the multiphase pulse. An example of implementing the switch (5) configured to generate multiphase pulses is to connect a thyristor in parallel with a diode. By receiving a repetitive trigger signal, the thyristor remains on from the start of each multiphase pulse until the end of each multiphase pulse. At the end of each multiphase pulse, the thyristor automatically turns off because the current I... L1 When the value is zero, the repeated triggering signal is stopped. Other implementations consistent with the spirit of this invention may also be used.

[0076] refer to Figure 2B The following are examples of using... Figure 1 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1 A schematic graph is provided, in this embodiment, configured to generate a biphasic pulse via a switch (5). The amplitude is normalized, and a biphasic pulse is plotted. The time axis scale is specifically adjusted for the waveform in this graph to make it clearly visible and differs from the time scale of other graphs included in this patent. To generate the biphasic pulse, the switch (5) is configured to close at the beginning of each biphasic pulse and remain closed until period T. d End. At the start of each biphase pulse, the first energy storage device (2) is charged with the initial voltage, and the second energy storage device (3) is discharged. At T d At / 4, the voltage V C2 and V C3 The values ​​are equal, and their values ​​are 50% of the initial voltage of the first energy storage device (2), and the current I L1It reaches its maximum positive value. At T d At / 2, due to losses caused by ohmic resistance, the second energy storage device (3) is charged with a voltage equal to the initial voltage of the first energy storage device (2) minus the minimum voltage reduction, and the first energy storage device (2) is not fully discharged but retains a minimum voltage increment greater than zero. Moreover, at T d / At time 2, the current I L1 The value of is zero, after which the current begins to flow in the opposite direction. At 3T d At / 4, the voltage V C2 and V C3 The values ​​are then equalized again, and are 50% of the initial voltage of the first energy storage device (2), with current I... L1 It reaches its maximum negative value. In T d At that time, the two energy storage devices (2) and (3) have been charged almost to their initial values. Due to ohmic resistance losses, the first energy storage device (2) has a voltage obtained by subtracting the minimum voltage decrease from its initial voltage, and the second energy storage device (3) has a minimum voltage increment greater than zero. At T d When the biphase pulse ends, switch (5) is turned off, and energy source (4) recharges the first energy storage device (2) to its initial voltage by only needing to replenish the minimum voltage reduction, while the minimum voltage increment of the second energy storage device (3) drops to zero, for example, due to its internal resistance, in order to generate the next biphase pulse. The stimulation intensity can be adjusted by selectively adjusting the voltage amplitude of the first energy storage device (2) before the start of the biphase pulse. An example of implementing a switch (5) configured to generate biphase pulses is to connect a thyristor and a diode in parallel. By receiving a trigger signal, the thyristor turns on at the start of each biphase pulse and at T d Current I at / 2 L1 It automatically turns off when the voltage is zero, allowing reverse current to flow through the diode during the second half-cycle. Other implementations consistent with the spirit of this invention may also be used.

[0077] refer to Figure 2C The following are examples of using... Figure 1 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1 A schematic graph is provided, in this embodiment, configured to generate a half-sine pulse via a switch (5). The amplitude is normalized, and a half-sine pulse is plotted. The time axis scale is specifically adjusted for the waveform in this graph to make it clearly visible and differs from the time scale of other graphs included in this patent. To generate the half-sine pulse, the switch (5) is configured to close at the beginning of each half-sine pulse and remain closed until T. d / 2. At the beginning of each half-sine pulse, the first energy storage device (2) is charged with an initial voltage, and the second energy storage device (3) is discharged. At T d At / 4, the voltage V C2 and V C3 The values ​​are equal, and their values ​​are 50% of the initial voltage of the first energy storage device (2), and the current I L1 It reaches its maximum positive value. At T d At the end of each half-sine pulse at / 2, due to losses caused by ohmic resistance, the second energy storage device (3) is charged with a voltage equal to the initial voltage of the first energy storage device (2) minus the minimum voltage reduction, and the first energy storage device (2) is not fully discharged but retains a minimum voltage increment greater than zero. Moreover, at T d / At time 2, the current I L1 When the value is zero, switch (5) is turned off, allowing energy source (4) to recharge the first energy storage device (2) to its initial voltage, while the voltage of the second energy storage device (3) drops to zero, for example, due to its internal resistance, in order to generate the next half-sine pulse. The stimulation intensity can be adjusted by selectively adjusting the voltage amplitude of the first energy storage device (2) before the start of the half-sine pulse. An example of a switch (5) configured to generate a half-sine pulse is a thyristor. By receiving a trigger signal, the thyristor turns on at the start of each half-sine pulse and at T d Current I at / 2 L1 It automatically shuts off when the value is zero. Other implementations consistent with the spirit of this invention may also be used.

[0078] refer to Figure 3 This shows the Figure 1 The modification to the illustrated embodiment is a change in the position of switch (5), which is from... Figure 1 The first energy storage device (2) and the magnetic field generating device (1) are connected in series and included in the same branch of the loop as the magnetic field generating device (1), modified as follows: Figure 3 The device is connected in series between the first energy storage device (2) and the second energy storage device (3), and is included in the same branch of the loop as the second energy storage device (3). This change in topology does not alter the... Figure 1 Any feature, operation, or performance in the implementation method is for Figure 3 The implementation methods remain unchanged. When the positions of the magnetic field generating device (1) and the switch (5) are interchanged, the magnetic field is generated. Figure 3 Equivalent alternative implementations with the same features, operation, and performance as the embodiments shown. Figure 3 The implementation method can generate different types of current pulses, not limited to common types, but also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points when the switch (5) is opened and closed accordingly.

[0079] refer to Figure 4 This shows the Figure 1 Another modification to the illustrated embodiment. This modification involves changing the position of the switch (5), which moves from... Figure 1 The first energy storage device (2) and the magnetic field generating device (1) are connected in series and included in the same branch of the loop as the magnetic field generating device (1), modified as follows: Figure 4 The device is connected in series between the first energy storage device (2) and the magnetic field generating device (1), and is included in the same branch of the loop as the first energy storage device (2). This change in topology alters the following aspects: Figure 1 Operation of the implementation method: The energy source (4) is not like Figure 1 The implementation method and by Figure 1 Instead of charging the first energy storage device (2) as in all other embodiments derived from the previous implementation, the second energy storage device (3) is charged. Figure 4 Compared with the implementation method Figure 1 Another difference in the implementation method is that, in Figure 4 In this embodiment, during the charging of the second energy storage device (3) from the energy source (4), current flows through the magnetic field generating device (1). Figure 1 Compared to the performance of the implementation method, this is in Figure 4 The implementation method has performance drawbacks because when current flows through the magnetic field generating device (1) during the charging phase of the second energy storage device (3), additional losses occur due to ohmic resistance during charging. The magnetic field generating device (1) generates unnecessary additional heat and increases cooling requirements. The need for a protection circuit for the energy source (4) is reduced but still exists. Furthermore, a magnetic field with unusual characteristics and effects not explored in the field of tissue magnetic stimulation is emitted during charging. On the other hand, in the case of generating paired or dual pulses, Figure 4 Compared with the implementation method Figure 1 The implementation method provides advantages, wherein, compared with that by Figure 1 The implementation methods derived from Figure 12 Compared to the previous implementation, this implementation requires fewer switches.

[0080] refer to Figure 5 A schematic diagram of an alternative implementation of a magnetic stimulator for generating multiphase, biphase, half-sine, and single-phase current pulses is shown. Figure 5 The implementation method is in Figure 1 The embodiment also includes a series-connected resistor (6) and a second switch (7), and the series-connected resistor (6) and the second switch (7) are connected in parallel with the second energy storage device (3) to selectively discharge either or both of the two energy storage devices (2) and (3). Figure 6BAs described, this embodiment provides optimized efficiency and performance when continuously generating biphase pulses with a voltage drop percentage of less than 11%. Furthermore, as... Figure 6A As described, this embodiment also provides optimized efficiency and performance when continuously generating multiphase pulses with a 50% voltage drop, because it can remove the unwanted residual voltage of the second energy storage device (3) at the end of each multiphase pulse by discharging the second energy storage device (3) through the resistor (6). More specifically, Figure 5 The implementation method is Figure 1 The implementation adds a series-connected resistor (6) and a second switch (7). The branch consisting of the series-connected resistor (6) and the second switch (7) is connected in parallel with the second energy storage device (3). The branch with added resistor (6) and second switch (7) allows selective discharge of the first energy storage device (2) or the second energy storage device (3) or both, without altering the resonant circuit consisting of the first energy storage device (2), the second energy storage device (3), and the magnetic field generating device (1). The first switch (5) and the second switch (7) can be configured to open and close independently and selectively at any time and in any combination, thereby freely generating current pulses of different shapes in addition to common types of current pulses. For common types of current pulses, more specifically, the advantages of the branch with added resistor (6) and second switch (7) for each type of current pulse are as follows. For multiphase pulses, such as Figure 6A As depicted, at the end of each multiphase pulse, the second switch (7) closes to allow the initial voltage V of the second energy storage device (3) to be released. C2 The remaining 50% is rapidly discharged, while the first switch (5) is opened to recharge the first energy storage device (2) from the energy source (4). For biphase pulses, such as Figure 6B What is described is in T d At the end of each biphase pulse, the second switch (7) closes to allow the second energy storage device (3) to discharge rapidly at the minimum voltage increment greater than zero, while the first switch (5) opens to allow the energy source (4) to replenish the minimum voltage increment of the first energy storage device (2) and recharge it back to the initial V. C2 For a half-sine pulse, such as Figure 6C What is described is in T d At / 2, the second switch (7) closes to allow the remaining voltage of the second energy storage device (3) to be discharged quickly, while the first switch (5) opens to allow the first energy storage device (2) to be recharged from the energy source (4). Therefore, for multiphase pulses, biphase pulses, and half-sinusoidal pulses, the branch of resistor (6) with the second switch (7) allows the remaining unwanted voltage of the second energy storage device (3) to be discharged quickly, which provides a higher voltage than... Figure 1The implementation method achieves a lower voltage drop percentage and a higher pulse repetition rate, thus contributing to improved efficiency and performance. To allow for rapid discharge, the resistance value of resistor (6) is low, preferably in the range of several hundred milliohms. For single-phase pulses, such as... Figure 6D What is described is in T d At 4 o'clock, the second switch (7) is closed, and the first switch (5) remains closed until both energy storage devices (2) and (3) are connected to the resistor (6) from a voltage equal to the initial voltage V. C2 50% of the remaining voltage is completely discharged to obtain a single-phase waveform current pulse. When the first energy storage device (2) is completely discharged, the first switch (5) is opened so that the energy source (4) can start to recharge the first energy storage device (2) to generate the next single-phase pulse. On the other hand, adding the branch of resistor (6) and second switch (7) also facilitates the continuous transmission of continuous pulses, because without this branch, the remaining voltage in the second energy storage device (3) will accumulate at the end of each pulse, and after several pulses, the voltages of the two energy storage devices (2) and (3) will be equal, and no other pulses can be generated. The second switch (7) can be implemented with any kind of switching element or combination thereof, such as thyristor, diode, IGBT, MOSFET, JFET, BJT. Other switching elements that are consistent with the spirit of the present invention can also be used. When the positions of the first switch (5) and the magnetic field generating device (1) are interchanged and / or the positions of resistor (6) and second switch (7) are interchanged, a single-phase waveform current pulse is generated. Figure 5 Equivalent alternative implementations with the same features, operation, and performance as the embodiments shown. Figure 5 The implementation method can generate different types of current pulses, not limited to common types, but also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points of each switch opening and closing accordingly.

[0081] refer to Figure 6A The following are examples of using... Figure 5 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1A schematic graph is provided, in which this embodiment is implemented by configuring a first switch (5) and a second switch (7) to generate multiphase pulses. The amplitude is normalized, and two multiphase pulses are depicted. The time axis scale is specifically adjusted for the waveforms in this graph to make them clearly visible and is different from the time scale of other graphs included in this patent. In order to generate multiphase pulses, the first switch (5) is configured to close at the beginning of each multiphase pulse and remain closed until the end of each multiphase pulse, during which time the resonant circuit oscillates freely. At the end of each multiphase pulse, the first switch (5) is opened and remains open until the start of the next multiphase pulse. At the beginning of each multiphase pulse, the first energy storage device (2) is charged with an initial voltage, and the second energy storage device (3) is discharged. At the end of each multiphase pulse, the remaining voltages of the two energy storage devices (2) and (3) are equal, and their value is 50% of the initial voltage of the first energy storage device (2). After the first switch (5) opens at the end of each multiphase pulse, the energy source (4) recharges the first energy storage device (2) from 50% of its initial voltage to 100%. The second switch (7) remains open from the beginning to the end of each multiphase pulse. At the end of each multiphase pulse, the second switch (7) closes, allowing the second energy storage device (3) to discharge through the resistor (6). When the second energy storage device (3) is fully discharged and the current flowing through the resistor (6) and the second switch (7) is zero, the second switch (7) opens again. The stimulation intensity can be adjusted by selectively adjusting the voltage amplitude of the first energy storage device (2) before the start of the multiphase pulse. An example of implementing the first switch (5) configured to generate multiphase pulses is to connect a thyristor in parallel with a diode. By receiving a repetitive trigger signal, the thyristor remains on from the beginning to the end of each multiphase pulse. At the end of each multiphase pulse, the thyristor automatically turns off because the current I L1 When the current is zero, the repeated trigger signal is stopped. An example of implementing the second switch (7) is a thyristor that turns on at the end of each multiphase pulse by receiving the trigger signal and remains on until the second energy storage device (3) is fully discharged. When the second energy storage device (3) is fully discharged, the current flowing through the resistor (6) and the second switch (7) drops to zero, and the thyristor of the second switch (7) automatically turns off. Other implementations consistent with the spirit of the invention can also be used for the first switch (5) and the second switch (7).

[0082] refer to Figure 6B The following are examples of using... Figure 5 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1A schematic graph is provided, in which this embodiment is implemented by configuring a first switch (5) and a second switch (7) to generate biphasic pulses. The amplitude is normalized, and two biphasic pulses are plotted. The time axis scale is specifically adjusted for the waveforms in this graph to make them clearly visible and is different from the time scale of other graphs included in this patent. In order to generate biphasic pulses, the first switch (5) is configured to close at the beginning of each biphasic pulse and remain closed until period T. d End. At the start of each biphase pulse, the first energy storage device (2) is charged with the initial voltage, and the second energy storage device (3) is discharged. At T d At / 4, the voltage V C2 and V C3 The values ​​are equal, and their values ​​are 50% of the initial voltage of the first energy storage device (2), and the current I L1 It reaches its maximum positive value. At T d At / 2, due to losses caused by ohmic resistance, the second energy storage device (3) is charged with a voltage equal to the initial voltage of the first energy storage device (2) minus the minimum voltage reduction, and the first energy storage device (2) is not fully discharged but retains a minimum voltage increment greater than zero. Moreover, at T d When / 2, the current I L1 The value of is zero, after which the current begins to flow in the opposite direction. At 3T d At / 4, the voltage V C2 and V C3 The values ​​are then equalized again, and are 50% of the initial voltage of the first energy storage device (2), with current I... L1 It reaches its maximum negative value. In T d At that time, the two energy storage devices (2) and (3) have been charged almost to their initial values. Due to ohmic resistance losses, the first energy storage device (2) has a voltage obtained by subtracting the minimum voltage decrease from its initial voltage, and the second energy storage device (3) has a minimum voltage increment greater than zero. At T d At the end of the two-phase pulse, the first switch (5) is open, and the energy source (4) recharges the first energy storage device (2) to its initial voltage by only needing to replenish the minimum voltage reduction. The second switch (7) remains open throughout the entire cycle of the two-phase pulse and at T d The circuit closes when the resistor (6) is closed, allowing the second energy storage device (3) to discharge at a minimum voltage increment greater than zero through the resistor (6). When the second energy storage device (3) is fully discharged and the current flowing through the resistor (6) and the second switch (7) is zero, the second switch (7) opens again. The stimulation intensity can be adjusted by selectively adjusting the initial voltage amplitude of the first energy storage device (2) before the start of the biphasic pulse. An example of implementing the first switch (5) configured to generate biphasic pulses is to connect a thyristor in parallel with a diode. By receiving a trigger signal, the thyristor turns on at the start of each biphasic pulse and at T dCurrent I at / 2 L1 When the current is zero, the second switch (7) automatically turns off, allowing the reverse current of the second half-cycle to flow through the diode. An example of implementing the second switch (7) is a thyristor that turns on at the end of each biphase pulse by receiving a trigger signal and remains on until the second energy storage device (3) is fully discharged. When the second energy storage device (3) is fully discharged, the current flowing through the resistor (6) and the second switch (7) drops to zero, and the thyristor of the second switch (7) automatically turns off. Other implementations consistent with the spirit of the invention can also be used for the first switch (5) and the second switch (7).

[0083] refer to Figure 6C The following are examples of using... Figure 5 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1 A schematic graph is provided, in this embodiment, configured with a first switch (5) and a second switch (7) to generate half-sine pulses. Amplitude normalization is performed, and two half-sine pulses are plotted. The time axis scale is specifically adjusted for the waveforms in this graph to ensure clear disclosure and differs from the time scale of other graphs included in this patent. To generate the half-sine pulses, the first switch (5) is configured to close at the beginning of each half-sine pulse and remain closed until T. d / 2. At the beginning of each half-sine pulse, the first energy storage device (2) is charged with an initial voltage, and the second energy storage device (3) is discharged. At T d At / 4, the voltage V C2 and V C3 The values ​​are equal, and their values ​​are 50% of the initial voltage of the first energy storage device (2), and the current I L1 It reaches its maximum positive value. At T d At the end of each half-sine pulse at / 2, due to the loss caused by the ohmic resistance, the second energy storage device (3) is charged with a voltage equal to the initial voltage of the first energy storage device (2) minus the minimum voltage reduction, and the first energy storage device (2) is not fully discharged but retains a minimum voltage increment greater than zero. At T d / At time 2, the current I L1 When the value is zero, the first switch (5) is turned off, allowing the energy source (4) to recharge the first energy storage device (2) back to its initial voltage. The second switch (7) remains off for the entire cycle of the half-sine pulse until T. d / 2. In T dAt / 2, the second switch (7) closes, allowing the voltage of the second energy storage device (3) to discharge through the resistor (6). When the second energy storage device (3) is fully discharged and the current flowing through the resistor (6) and the second switch (7) is zero, the second switch (7) opens again. The stimulation intensity can be adjusted by selectively adjusting the voltage amplitude of the first energy storage device (2) before the start of the half-sine pulse. An example of implementing the first switch (5) configured to generate a half-sine pulse is a thyristor. By receiving a trigger signal, the thyristor turns on at the start of each half-sine pulse and at T d Current I at / 2 L1 Automatically turns off when the current is zero. An example of implementing the second switch (7) is a thyristor that turns on at the end of each half-sine pulse by receiving a trigger signal and remains on until the second energy storage device (3) is fully discharged. When the second energy storage device (3) is fully discharged, the current flowing through the resistor (6) and the second switch (7) drops to zero, and the thyristor of the second switch (7) automatically turns off. Other implementations consistent with the spirit of the invention may also be used for the first switch (5) and the second switch (7).

[0084] refer to Figure 6D The following are examples of using... Figure 5 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1 A schematic graph is provided, in which this embodiment is implemented by configuring a first switch (5) and a second switch (7) to generate single-phase pulses. The amplitude is normalized, and two single-phase pulses are plotted. The time axis scale is specifically adjusted for the waveforms in this graph to make them clearly visible and is different from the time scale of other graphs included in this patent. At the beginning of each single-phase pulse, the first energy storage device (2) is charged with an initial voltage, and the second energy storage device (3) is discharged. In order to generate a single-phase pulse, the first switch (5) is configured to close at the beginning of each single-phase pulse and remain closed for more than T. d / 4, while the second switch (7) is configured to remain open from the start of each single-phase pulse, and at T d It closes at / 4. At T d At / 4, the voltage V C2 and V C3 The values ​​are equal, and their values ​​are 50% of the initial voltage of the first energy storage device (2), and the current I L1 It reaches its maximum positive value. At T d At / 4, the combination of the first switch (5) remaining closed and the second switch (7) being closed forces both energy storage devices (2) and (3) to release energy from their initial voltage V equal to that of the first energy storage device (2). C250% of the remaining voltage is completely discharged to zero. At T d At / 4, the current I L1 It begins to decay, and its shape follows the characteristic waveform of a single-phase pulse, which is exactly what the first switch (5) is doing at T. d / 4 remains closed and not open. When both energy storage devices (2) and (3) are fully discharged, the first switch (5) and the second switch (7) are opened, and the energy source (4) begins to recharge the first energy storage device (2) to generate the next single-phase pulse. The stimulation intensity can be adjusted by selectively adjusting the voltage amplitude of the first energy storage device (2) before the start of the single-phase pulse. An example of a first switch (5) configured to generate a single-phase pulse is a thyristor. By receiving a trigger signal, the thyristor turns on at the start of each single-phase pulse and when the first energy storage device (2) is fully discharged and the current I is... L1 Automatically turns off when the value is zero. An example of implementing the second switch (7) is a thyristor, which receives a trigger signal to turn off when T is zero. d The circuit is turned on at 4°C and remains on until both energy storage devices (2) and (3) are fully discharged through resistor (6). When both energy storage devices (2) and (3) are fully discharged, the current flowing through resistor (6) and the second switch (7) drops to zero, and the thyristor of the second switch (7) automatically turns off. Other implementations consistent with the spirit of the invention can also be used for the first switch (5) and the second switch (7). If necessary, an additional diode connected in parallel with the first energy storage device (2) can be used to eliminate the current at T. d / 4 after which a tiny reverse charge appears at the first energy storage device (2) at the end of the first energy storage device discharge.

[0085] refer to Figure 7 A schematic diagram of an alternative implementation of a magnetic stimulator for generating multiphase, biphase, half-sine, and single-phase current pulses is shown. Figure 7 The implementation method is in Figure 5 The embodiment further includes a third switch (9) and a second resistor (8) connected in series, and the third switch (9) and the second resistor (8) connected in series are connected in parallel with the first switch (5) and the magnetic field generating device (1) connected in series. Figure 8 As described, this embodiment provides optimized efficiency and performance when continuously generating single-phase pulses with a 50% voltage drop. More specifically, Figure 7 The implementation method is Figure 5 The implementation adds an additional loop branch connected in parallel with the first switch (5) and the magnetic field generating device (1) connected in series. This additional branch consists of a third switch (9) and a second resistor (8) connected in series. Figure 6D As shown, in the case of continuously generating single-phase pulses, Figure 5The disadvantage of this implementation method is that fully discharging the first energy storage device (2) requires turning the first switch (5) to T. d Keep it closed at / 4 so that current I L1 The characteristic waveform of a single-phase current pulse is generated by attenuation through the first resistor (6). If in Figure 5 In the implementation method, the first switch (5) is in T d Disconnect at / 4, then I L1 It will suddenly drop to zero, thus not generating the characteristic waveform of a single-phase current pulse. Figure 7 The implementation method eliminates the following Figure 5 The disadvantage of this implementation is that the branch of the third switch (9) and the second resistor (8) is introduced, which allows the current I... L1 The voltage decreases accordingly to generate a single-phase current pulse, while the first energy storage device (2) maintains 50% of its initial voltage and does not need to be compensated for by recharging from the energy source (4) to generate the next single-phase pulse. At T d At / 4, the voltage V of the two energy storage devices (2) and (3) C2 and V C3 Each is equal, and its value is 50% of the initial voltage of the first energy storage device (2). Therefore, from this perspective, there is no voltage difference that forces the current I. L1 The flow continues. However, due to the induced electromotive force exerted by the weakened magnetic field around the magnetic field generating device (1), I is driven... L1 Continue flowing. By switching the third switch (9) at T d / 4 closes and makes the first switch (5) at T d After / 4, it remains closed, allowing T d At / 4, the current I is driven by the weakened magnetic field around the magnetic field generating device (1). L1 Attenuation occurs through the second resistor (8). The result of this scheme is the generation of I... L1 The characteristic single-phase waveform current pulse, and also keeps the two energy storage devices (2) and (3) at 50% of the initial voltage of the first energy storage device (2). The second resistor (8) has a selected resistance value so that the pulse duration of the single-phase pulse corresponds to a common and acceptable range of single-phase pulse duration. When I L1When the voltage reaches zero, the first switch (5) and the third switch (9) are open, and at this point, the second switch (7) is closed, allowing the unwanted residual voltage of the second energy storage device (3) to be discharged through the first resistor (6). Therefore, an energy source (4) is needed to compensate the first energy storage device (2) from 50% to 100% of its initial voltage to immediately follow the next single-phase pulse, which can also be expressed as a 50% voltage drop. The third switch (9) can be implemented with any kind of switching element or combination thereof, such as thyristors, diodes, IGBTs, MOSFETs, JFETs, BJTs. Other switching elements that are consistent with the spirit of the invention may also be used. When the positions of the first switch (5) and the magnetic field generating device (1) are interchanged and / or the positions of the third switch (9) and the second resistor (8) are interchanged and / or the positions of the first resistor (6) and the second switch (7) are interchanged, a voltage is generated. Figure 7 Equivalent alternative implementations with the same features, operation, and performance as the embodiments shown. Figure 7 The implementation method can generate different types of current pulses, not limited to common types, but also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points of each switch opening and closing accordingly.

[0086] refer to Figure 8 The following are examples of using... Figure 7 The voltage V generated by the implementation method of the two energy storage devices (2) and (3) C2 and V C3 and the current I of the magnetic field generating device (1) L1 A schematic graph is provided, in which the embodiment is implemented by configuring a first switch (5), a second switch (7), and a third switch (9) to generate single-phase pulses. The amplitude is normalized, and two single-phase pulses are plotted. The time axis scale is specifically adjusted for the waveforms in this graph to make them clearly visible and is different from the time scale of other graphs included in this patent. At the beginning of each single-phase pulse, the first energy storage device (2) is charged with an initial voltage, and the second energy storage device (3) is discharged. In order to generate a single-phase pulse, the first switch (5) is configured to close at the beginning of each single-phase pulse and remain closed for more than T. d / 4, while the third switch (9) is configured to remain open from the start of each single-phase pulse and at T d The switch is closed at / 4, and the second switch (7) is configured to remain open from the start of each single-phase pulse and to supply current I at the end of each single-phase pulse. L1 It closes when it equals zero. At T d At / 4, the voltage V C2 and V C3 The values ​​are equal, and their values ​​are 50% of the initial voltage of the first energy storage device (2), and the current I L1 It reaches its maximum positive value. At Td At / 4, the combination of the first switch (5) remaining closed and the third switch (9) being closed forces the current I driven by the electromotive force caused by the weakened magnetic field around the magnetic field generating device (1). L1 The voltage V decays from its maximum positive value to zero through the second resistor (8), forming the characteristic waveform of a single-phase pulse, and the voltage V C2 and V C3 The voltage is rebalanced to 50% of the initial voltage of the first energy storage device (2). When I L1 When the voltage is zero, switches (5) and (9) are open, and the second switch (7) is closed, allowing only the second energy storage device (3) to discharge to zero from the remaining 50% of the initial voltage of the first energy storage device (2) through the first resistor (6). Simultaneously, the energy source (4) begins to recharge the first energy storage device (2) to generate the next single-phase pulse. The stimulation intensity can be adjusted by selectively regulating the voltage amplitude of the first energy storage device (2) before the start of the single-phase pulse. This enables the generation of pulses based on... Figure 8 single-phase pulse Figure 7 An example of the first switch (5) in the implementation is a thyristor that turns on at the start of each single-phase pulse by receiving a trigger signal and when the current I... L1 Automatically shuts off when the value is zero. Implemented for generating data based on... Figure 8 single-phase pulse Figure 7 An example of the third switch (9) in the implementation is a thyristor, which controls the T signal by receiving a trigger signal. d It turns on at / 4 and at current I L1 Automatically shuts off when the value is zero. Implemented for generating data based on... Figure 8 single-phase pulse Figure 7 An example of the second switch (7) in the implementation is a thyristor, which terminates the single-phase pulse current I L1 It is turned on when the current is zero and automatically turned off when the second energy storage device (3) is fully discharged and the current flowing through the resistor (6) and the second switch (7) drops to zero. Other implementations consistent with the spirit of the present invention may also be used for the first switch (5), the second switch (7) and the third switch (9).

[0087] refer to Figure 9 A schematic diagram of an alternative implementation of a magnetic stimulator for generating multiphase, biphase, half-sine, and single-phase current pulses is shown. Figure 9 The implementation method is in Figure 5 The embodiment further includes a third switch (11) and a second magnetic field generating device (10) connected in series, and the third switch (11) and the second magnetic field generating device (10) connected in series are connected in parallel with the first switch (5) and the first magnetic field generating device (1) connected in series. Figure 10As described, this embodiment provides optimized efficiency and performance when continuously generating half-sine pulses with a voltage drop percentage of less than 9%. More specifically, Figure 9 The implementation method is Figure 5 The implementation adds an additional loop branch connected in parallel with the first switch (5) and the first magnetic field generating device (1) connected in series. This additional branch is connected to the third switch (11) and has an inductance L. 10 The second magnetic field generating device (10) is connected in series. Figure 6C As shown, in the case of continuously generating half-sine pulses, Figure 5 The implementation method has the following two disadvantages: In T d At / 2, the first energy storage device (2) needs to be fully recharged from the minimum voltage increment greater than zero to its initial voltage, and the second energy storage device (3) needs to be fully discharged from the voltage obtained by subtracting the minimum voltage decrease from the initial voltage of the first energy storage device (2) in order to generate the next half-sine pulse. Figure 9 The implementation method eliminates the following Figure 5 These disadvantages of the implementation method: such as Figure 10 As shown, the branch includes the third switch (11) and the second magnetic field generating device (10), thereby allowing T d The oscillation continues for the second half-cycle at / 2, but in this second half-cycle, the magnetic field generating device that forms a resonant circuit with the two energy storage devices (2) and (3) is the second magnetic field generating device (10), not the first magnetic field generating device (1) in the first half-cycle. This is achieved through T d This is achieved by disconnecting the first switch (5) and closing the third switch (11) at / 2. Using this scheme, in the first half-cycle, as... Figure 10 I L1 The waveform depicts a half-sinusoidal current pulse generated at the first magnetic field generating device (1), which is a stimulation device placed on the tissue stimulation area, and in the second half-cycle, as shown... Figure 10 The described reverse current I L10 The flow passes through the second magnetic field generating device (10), which does not participate in tissue stimulation. As a result, at the end of the second half-cycle, the voltage of the first energy storage device (2) is almost equal to its initial voltage minus the minimum voltage reduction, which the energy source (4) only needs to replenish. The second energy storage device (3) has a minimum voltage increment greater than zero, which discharges through the resistor (6). It is concluded that after the second energy storage device (3) discharges, the measured voltage drop percentage is less than 9%. The inductance L of the second magnetic field generating device (10) 10 The preferred value is not lower than that of inductor L1 in order to obtain a lower voltage drop percentage, thereby achieving higher efficiency and improved performance, because this facilitates the remaining V at the end of the second half-cycle.C2 Get as close as possible to the initial voltage, and make the remaining V C3 As close to zero as possible. Inductors L1 and L 10 The differences between them distinguish the resonance cycles of the first and second half-cycles, such as Figure 10 The latter, as depicted, lasts longer. At the end of the second half-cycle, when the current I... L10 When the voltage is zero, the third switch (11) is open and the second switch (7) is closed, allowing the unwanted residual voltage of the second energy storage device (3) to be discharged through the resistor (6). The third switch (11) can be implemented with any kind of switching element or combination thereof, such as thyristors, diodes, IGBTs, MOSFETs, JFETs, BJTs. Other switching elements consistent with the spirit of the invention may also be used. When the positions of the first switch (5) and the first magnetic field generating device (1) are interchanged and / or the positions of the third switch (11) and the second magnetic field generating device (10) are interchanged and / or the positions of the resistor (6) and the second switch (7) are interchanged, a voltage is generated. Figure 9 Equivalent alternative implementations with the same features, operation, and performance as the embodiments shown. Figure 9 The implementation method can generate different types of current pulses, not limited to common types, but also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points of each switch opening and closing accordingly.

[0088] Referring to Figure 10, the following are shown respectively using... Figure 9 The voltage V generated by the magnetic stimulator and the two energy storage devices (2) and (3) C2 and V C3 The current I of the first magnetic field generating device (1) L1 and the current I of the second magnetic field generating device (10) L10 A schematic graph is provided, in which the embodiment is implemented by configuring a first switch (5), a second switch (7), and a third switch (11) to generate a half-sine pulse. The amplitude is normalized, and two half-sine pulses are plotted. The time axis scale is specifically adjusted for the waveforms in this graph to make them clearly visible and is different from the time scale of other graphs included in this patent. At the beginning of each half-sine pulse, the first energy storage device (2) is charged with an initial voltage, and the second energy storage device (3) is discharged. In order to generate a half-sine pulse, the first switch (5) is configured to close at the beginning of each half-sine pulse and at T d At the end of the first half-cycle at / 2, the switch is disconnected, while the third switch (11) is configured to remain disconnected from the beginning of each half-sine pulse and at T d / 2 o'clock I L1 It closes when the value is zero. At T dAt / 2, the combination of the first switch (5) opening and the third switch (11) closing forces the second magnetic field generating device (10) to replace the first magnetic field generating device (1) in the first half-cycle to continue oscillating in the second half-cycle. At the end of the second half-cycle, when I L10 When the current is zero, the third switch (11) is open, and at that time, the second switch (7) is closed until the current flowing through the second switch (7) and the resistor (6) reaches zero. The intensity of the stimulus can be adjusted by selectively adjusting the voltage amplitude of the first energy storage device (2) before the half-sine pulse begins. An example of implementing the first switch (5), the second switch (7), and the third switch (11) is that each switch has a thyristor, wherein, as already stated, each thyristor receives a trigger signal at its appropriate time, and each thyristor automatically turns off when the current flowing through it reaches zero. Other implementations consistent with the spirit of the invention may also be used for the first switch (5), the second switch (7), and the third switch (11).

[0089] refer to Figure 11 A schematic diagram of an alternative implementation of a magnetic stimulator for generating multiphase, biphase, half-sine, and single-phase current pulses is shown. Figure 11 The implementation method is in Figure 5 The embodiment further includes a third switch (9) and a second resistor (8) connected in series, as well as a fourth switch (11) and a second magnetic field generating device (10) connected in series. The third switch (9) and the second resistor (8), as well as the fourth switch (11) and the second magnetic field generating device (10) connected in series, are connected in parallel with the first switch (5) and the first magnetic field generating device (1) connected in series. Figure 6B As described, this embodiment provides optimized efficiency and performance when continuously generating biphase pulses with a voltage drop percentage of less than 11%. Furthermore, as... Figure 6A As described, this embodiment provides optimized efficiency and performance when continuously generating multiphase pulses with a 50% voltage drop. Furthermore, as... Figure 8 As described, this embodiment provides optimized efficiency and performance when continuously generating single-phase pulses with a 50% voltage drop. Furthermore, as... Figure 10 As described, this embodiment provides optimized efficiency and performance when continuously generating half-sine pulses with a voltage drop percentage of less than 9%. Therefore, Figure 11 The implementation provides the possibility of generating any one of the four common types of current pulses and any combination thereof with the highest efficiency and performance, by requiring a minimum number of four switches, minimizing losses due to ohmic resistance, and minimizing synchronization requirements. More specifically, Figure 11 The implementation method is Figure 5The embodiment further adds a first additional circuit branch connected in parallel with the first switch (5) and the first magnetic field generating device (1) connected in series, and a second additional circuit branch connected in parallel with the first switch (5) and the first magnetic field generating device (1) connected in series. The first additional branch consists of a third switch (9) and a second resistor (8) connected in series. The second additional branch consists of a fourth switch (11) and a resistor with inductance L. 10 The second magnetic field generating device (10) is connected in series. Figure 11 The characteristics, operation, and performance of the implementation method are comparable to those of the method in continuously generating multiphase and biphase current pulses. Figure 5 The implementation method is equivalent to that of the previous one, and is comparable to the previous one in terms of continuously generating single-phase current pulses. Figure 7 The implementation method is equivalent to that of the method, and is comparable to the method in terms of continuously generating half-sinusoidal current pulses. Figure 9 The implementation methods are equivalent. The only difference in generating different types of current pulses lies in the timing of the switching device opening and closing. For each type of current pulse, the timing of the switching device opening and closing follows respectively. Figure 5 , Figure 7 and Figure 9 Analysis of the implementation methods. Figure 11 The implementation method can generate different types of current pulses, not limited to common types, but also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points of each switch opening and closing accordingly.

[0090] refer to Figure 12 The diagram illustrates an alternative implementation of a magnetic stimulator for generating current pulses of the following types: polyphase paired or double pulses, biphase paired or double pulses, monophase paired or double pulses, half-sine paired or double pulses, higher amplitude polyphase single pulses, higher amplitude biphase single pulses, higher amplitude monophase single pulses, and higher amplitude half-sine single pulses. Figure 12 The implementation method is in Figure 5 The embodiment further includes: a third energy storage device (12) and a third switch (13) connected in series, the third energy storage device (12) and the third switch (13) being connected in parallel with a magnetic field generating device (1) and a second energy storage device (3) connected in series, wherein the third energy storage device (12) is further coupled to an energy source (4); and a fourth switch (14) and a fifth switch (15) for allowing the energy source (4) to selectively charge only the first energy storage device (2), or only the third energy storage device (12), or both, to generate the same or different types of current pulse pairs or any type of higher amplitude single pulse. This embodiment provides optimized efficiency and performance in the case of continuously generating multiphase paired or double pulses, two-phase paired or double pulses, higher amplitude multiphase single pulses, and higher amplitude two-phase single pulse types of current pulses. More specifically, Figure 12 The implementation method is in Figure 5 The embodiment further includes: a third energy storage device (12) and a third switch (13) connected in series, which are connected in parallel with a magnetic field generating device (1) and a second energy storage device (3) connected in series. A first switch (5) is located outside the closed path of the third energy storage device (12), the third switch (13), the magnetic field generating device (1), and the second energy storage device (3), and the third energy storage device (12) is further connected in parallel with an energy source (4); and a fourth switch (14) and a fifth switch (15), which are coupled such that the energy source (4) selectively charges only the first energy storage device (2), only the third energy storage device (12), or both. The capacitance of the third energy storage device (12) is C. 12 For example, capacitor C 12Equal to capacitors C2 and C3. Selective operation of the first switch (5) and the third switch (13) allows this embodiment to emit any type of first current pulse due to the oscillation of the resonant circuit composed of the first energy storage device (2), the second energy storage device (3), and the magnetic field generating device (1), and then cause the second energy storage device (3) to discharge through the branch of the resistor (6) and the second switch (7). After these events, any type of second current pulse is emitted due to the oscillation of the resonant circuit composed of the third energy storage device (12), the second energy storage device (3), and the magnetic field generating device (1), and then the second energy storage device (3) is discharged again through the branch of the resistor (6) and the second switch (7). The first current pulse and the second current pulse constitute a pair of pulses or a double pulse. The first pulse and the second pulse can be of any type, can be of the same type, or can be of different types, and their selection depends on the selected time points when the first switch (5) and the second switch (7) are opened and closed during the first current pulse and when the third switch (13) and the second switch (7) are opened and closed during the second current pulse. The time interval between the first pulse and the second pulse is selectable and is adjusted by the timing of closing the third switch (13) after the second energy storage device (3) discharges following the end of the first pulse. Adding the fourth switch (14) and the fifth switch (15) serves two different purposes. The first purpose is to prevent a short circuit between the first energy storage device (2) and the third energy storage device (12), which would result in an equivalent energy storage device whose capacitance is the sum of the capacitances of the first energy storage device (2) and the third energy storage device (12) connected in parallel, thus preventing the generation of paired or double pulses. This first purpose is achieved by avoiding the simultaneous closing of the fourth switch (14) and the fifth switch (15) during oscillation, and also by avoiding the simultaneous closing of the first switch (5) and the third switch (13) during oscillation. The second purpose is to provide the possibility of independently selecting the amplitude of the first and second pulses in paired or double pulses. This second objective is achieved by keeping the fourth switch (14) and the fifth switch (15) closed simultaneously for different durations during the charging phase when the first energy storage device (2) and the third energy storage device (12) are charged separately by the energy source (4)—during which the first switch (5) and the third switch (13) remain open. To generate a higher amplitude single pulse, during the charging phase when the first energy storage device (2) and the third energy storage device (12) are charged separately by the energy source (4)—during which the first switch (5) and the third switch (13) remain open—the fourth switch (14) and the fifth switch (15) remain closed simultaneously for the same duration. During the oscillation phase, in the case of generating a higher amplitude single pulse, the first switch (5) and the third switch (13) are closed and open simultaneously for the same duration, while the fourth switch (14) and the fifth switch (15) remain open.A single pulse of any type with higher amplitude current has a higher maximum amplitude, a maximum rate of change of the same magnitude, a longer pulse duration, and an increased operating voltage rating compared to the first or second current pulse in a pair or double pulse of the same type. For example, ... Figure 12 The implementation can be extended to employ a scheme similar to the third energy storage device (12), the third switch (13), and the fifth switch (15) to implement additional energy storage devices and switches in order to generate multiple continuous pulses, instead of Figure 12 The paired pulses generated by the implementation method. All switches can be implemented using any type of switching element or combination thereof, such as thyristors, diodes, IGBTs, MOSFETs, JFETs, BJTs. Other switching elements consistent with the spirit of the invention may also be used. When the positions of resistor (6) and the second switch (7) are interchanged, a pair of pulses is generated. Figure 12 Equivalent alternative implementations with the same features, operation, and performance as the embodiments shown. Figure 12 The implementation method can generate different types of current pulses, not limited to common types, but also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points of each switch opening and closing accordingly.

[0091] refer to Figure 13 The following are examples of implementations. Figure 12 The voltage V generated by the implementation method of the three energy storage devices (2), (3) and (12) C2 V C3 and V C12 and the current I of the magnetic field generating device (1) L1 A schematic graph is provided, in which the embodiment is implemented by configuring a first switch (5), a second switch (7), a third switch (13), a fourth switch (14), and a fifth switch (15) to generate paired or dual-pulse biphase pulses. The amplitude is normalized, and two pairs of biphase pulses are depicted, each pair consisting of a first biphase pulse and a second biphase pulse. The time axis scale is specifically adjusted for the waveforms in this graph to make them clearly visible and is different from the time scale of other graphs included in this patent. Before each pair of biphase pulses begins, the first energy storage device (2) and the third energy storage device (12) are charged with an initial voltage, the second energy storage device (3) is discharged, and all switches are open. For example, in Figure 13 In this process, the initial voltages of the first energy storage device (2) and the third energy storage device (12) are equal, thus causing two identical biphase current pulses to be generated in each pair. Figure 13The equal initial voltages in the curve are generated by simultaneously closing and opening the fourth switch (14) and the fifth switch (15) for the same duration, so that the energy source (4) charges the first energy storage device (2) and the third energy storage device (12) equally after a pair of biphase pulses ends and before the start of the next pair of biphase pulses. In other cases where it is desired that the two pairs of biphase pulses have different specific amplitude values, the initial voltages of the first energy storage device (2) and the third energy storage device (12) are independently selected by closing and opening the fourth switch (14) and the fifth switch (15) for different durations during the charging phase. All switches are open before the start of the first biphase pulse in a pair of pulses and after the first energy storage device (2) and the third energy storage device (12) are charged with their initial voltages. At the start of the first biphase pulse in a pair of pulses, the first switch (5) is closed and remains closed for one resonant cycle until the end of the first biphase pulse in a pair of pulses, at which point the first switch (5) is opened, I L1 The value is zero. During the period of the first biphase pulse in a pair of pulses, the third switch (13) remains open. The period of the first biphase pulse in a pair of pulses refers to the period of the resonant circuit composed of the first energy storage device (2), the magnetic field generating device (1), and the second energy storage device (3). At the end of the first biphase pulse in a pair of pulses, the first switch (5) is open, and the second switch (7) is closed until the second energy storage device (3) is completely discharged through the resistor (6). When the second energy storage device (3) is completely discharged, the second switch (7) is open. After a selected time interval between the first biphase pulse and the second biphase pulse in a pair of pulses has elapsed, the third switch (13) is closed and remains closed for one resonant period until the end of the second biphase pulse in a pair of pulses. At this time point, the third switch (13) is open, and I L1The value is zero. During the period of the second biphase pulse in a pair of pulses, switch (5) remains open. The period of the second biphase pulse in a pair of pulses refers to the period of the resonant circuit consisting of the third energy storage device (12), the magnetic field generating device (1), and the second energy storage device (3). At the end of the second biphase pulse in a pair of pulses, the third switch (13) is open and the second switch (7) is closed until the second energy storage device (3) is completely discharged through the resistor (6). When the second energy storage device (3) is completely discharged, the second switch (7) is open. Before the start of each pair of biphase pulses, the fourth switch (14) and the fifth switch (15) are open and remain open until the end of the second biphase pulse in a pair of pulses. At this time, the fourth switch (14) and the fifth switch (15) are closed to charge the first energy storage device (2) and the third energy storage device (12) from the energy source (4). When the charging of the first energy storage device (2) and the third energy storage device (12) is achieved, the fourth switch (14) and the fifth switch (15) are open. An example of implementing the fourth switch (14) and the fifth switch (15) is that each switch has an IGBT, wherein each IGBT receives a control signal for a duration equal to the desired duration for which the IGBT is turned on. An example of implementing the second switch (7) is using a thyristor, wherein, as already stated, the thyristor receives a trigger signal at its appropriate time and the thyristor automatically turns off when the current flowing through the thyristor reaches zero. An example of implementing the first switch (5) and the third switch (13) is having a thyristor and a diode connected in parallel for each switch, wherein each thyristor turns on at the start of each biphase pulse in a pair of pulses by receiving a trigger signal and turns on at the half-cycle of the same biphase pulse when the current I... L1 It automatically turns off when the voltage is zero, allowing reverse current to flow through the diode during the second half-cycle. Other implementations consistent with the spirit of this invention may also be used.

[0092] refer to Figure 14 The following are examples of using... Figure 12 The voltage V generated by the implementation method of the three energy storage devices (2), (3) and (12) C2 V C3 and V C12 and the current I of the magnetic field generating device (1) L1A schematic graph is provided, in which the embodiment is implemented by configuring a first switch (5), a second switch (7), a third switch (13), a fourth switch (14), and a fifth switch (15) to generate biphasic higher amplitude single pulses. The amplitude is normalized, and two biphasic higher amplitude single pulses are plotted. The time axis scale is specifically adjusted for the waveforms in this graph to make them clearly visible and is different from the time scale of other graphs included in this patent. Before each biphasic higher amplitude single pulse begins, the first energy storage device (2) and the third energy storage device (12) are charged with an initial voltage, the second energy storage device (3) is discharged, and all switches are open. For example, in Figure 14 In this process, the initial voltages of the first energy storage device (2) and the third energy storage device (12) are equal, and are generated by simultaneously closing and then opening the fourth switch (14) and the fifth switch (15) for the same duration, so that the energy source (4) charges the first energy storage device (2) and the third energy storage device (12) equally after the end of a biphase higher amplitude single pulse and before the start of the next biphase higher amplitude single pulse. Before the start of each biphase higher amplitude single pulse and after the first energy storage device (2) and the third energy storage device (12) are charged with their initial voltages, all switches are opened. At the start of each biphase higher amplitude single pulse, the first switch (5) and the third switch (13) are simultaneously closed and remain closed for one resonant cycle until the end of the biphase higher amplitude single pulse, at which point the first switch (5) and the third switch (13) are opened, I L1The value is zero. During the period of each single pulse of the higher amplitude biphase type, the fourth switch (14) and the fifth switch (15) remain open. The period of each single pulse of the higher amplitude biphase type refers to the period of the resonant circuit composed of the equivalent energy storage device, the magnetic field generating device (1), and the second energy storage device (3), the capacitance of which is the sum of the capacitances of the first energy storage device (2) and the third energy storage device (12) connected in parallel. At the end of each single pulse of the higher amplitude biphase type, the first switch (5) and the third switch (13) are open, and the second switch (7) is closed until the second energy storage device (3) is completely discharged through the resistor (6). When the second energy storage device (3) is completely discharged, the second switch (7) is open. Before the start of each higher-amplitude biphase pulse, the fourth switch (14) and the fifth switch (15) are open and remain open until the end of the higher-amplitude biphase pulse, at which point the fourth switch (14) and the fifth switch (15) close to charge the first energy storage device (2) and the third energy storage device (12) from the energy source (4). When the first energy storage device (2) and the third energy storage device (12) are charged, the fourth switch (14) and the fifth switch (15) are open. An example of implementing the fourth switch (14) and the fifth switch (15) is that each switch has an IGBT, wherein each IGBT receives a control signal for a duration equal to the desired duration for which the IGBT is turned on. An example of implementing the second switch (7) is using a thyristor, wherein, as already stated, the thyristor receives a trigger signal at its appropriate time and the thyristor automatically turns off when the current flowing through it reaches zero. An example of implementing the first switch (5) and the third switch (13) is that each switch has a thyristor and a diode connected in parallel, wherein each thyristor is turned on at the start of each biphase higher amplitude single pulse by receiving a trigger signal, and at half a cycle of the same biphase higher amplitude single pulse, the current I... L1 It automatically turns off when the voltage is zero, allowing reverse current to flow through the diode during the second half-cycle. Other implementations consistent with the spirit of this invention may also be used.

[0093] refer to Figure 15 The diagram shows a preferred embodiment of the magnetic stimulator, wherein two energy storage devices (2) and (3) are disposed within a housing. Figure 15 The implementation method is in Figure 1 In this implementation, the two energy storage devices (2) and (3) are housed within a single housing. The advantage of this implementation is that it minimizes the length of the connecting conductors, which helps reduce the ohmic resistance of the circuit, thereby reducing the voltage drop percentage, the overall weight of the magnetic stimulator, and manufacturing costs. Figure 15 All other features and operations of the implementation method are the same as those of the implementation method. Figure 1The implementation method is the same. Similarly, for any other embodiment of the present invention, all energy storage devices included in each embodiment can be housed within a single housing.

[0094] refer to Figure 16 A schematic graph illustrating the relationship between energy transfer efficiency and the capacitance ratio of the two energy storage devices during oscillation of the basic resonant circuit of the present invention, considering zero ohmic resistance. Each energy storage device includes at least one capacitor, wherein the capacitances of the energy storage devices are preferably equal. Figure 16 As shown in the graph, energy transfer efficiency and voltage recovery are maximized when the capacitance ratio is C2=C3. Considering zero ohmic resistance, the ratio of the maximum energy stored in the first energy storage device (2) and the second energy storage device (3) of the basic resonant circuit during oscillation is calculated by the following equation:

[0095]

[0096] In the case where either of the two energy storage devices (2) and (3) consists of more than one capacitor connected in series and / or in parallel, the equivalent total capacitance of the energy storage device consisting of more than one capacitor is calculated based on the interconnection of the capacitors—in series or in parallel—by the capacitance of those capacitors.

[0097] refer to Figure 17 The diagram illustrates an alternative implementation of a magnetic stimulator, wherein the capacitance of the first energy storage device (2) and the capacitance of the second energy storage device (3) can be selected independently. One example of implementing an energy storage device with selectable capacitance is a variable capacitor whose capacitance can be changed mechanically or electronically. Another example of implementing an energy storage device with selectable capacitance is a group of capacitors interconnected in series and / or parallel, wherein the total capacitance of the group of capacitors can change with the operation of engaging or disengaging the individual capacitors. Figure 17 The first advantage of this implementation is that, by maximizing energy transfer efficiency by changing the capacitances of the two energy storage devices (2) and (3) respectively and keeping them equal after the change, the duration of the current pulse can be selectively adjusted for any type and waveform of current pulse. The ability to adjust the duration of the current pulse is a desirable feature in magnetic stimulation because different durations elicit different physiological and biological responses in tissues. Figure 17A second advantage of this implementation is that, during oscillation, when the capacitances of the two energy storage devices (2) and (3) change and become unequal, the voltage transfer ratio between the two energy storage devices (2) and (3) can be selectively adjusted. Adjusting the voltage transfer ratio is preferable when it is desired that the two energy storage devices (2) and (3) charge and discharge at different voltage values, either lower or higher.

[0098] refer to Figure 18 The diagram illustrates an alternative implementation of a magnetic stimulator for selectively activating similar or different magnetic field generating devices simultaneously or not simultaneously in a fundamental resonant circuit. Figure 18 The implementation method is in Figure 1 The implementation further includes multiple switches and multiple magnetic field generating devices, wherein each switch is connected in series with one magnetic field generating device to form a series branch, and all series branches are connected in parallel with each other and in parallel with the series branch of the first switch and the first magnetic field generating device. More specifically, Figure 18 The implementation method is in Figure 1 The implementation further includes multiple switches (second switch - nth switch) and multiple magnetic field generating devices (magnetic field generating device L2 - magnetic field generating device L). n In this circuit, each switch is connected in series with a magnetic field generating device, forming a series branch (second switch + magnetic field generating device L2, ..., nth switch + magnetic field generating device L...). n All series branches are connected in parallel to each other and in parallel with the series branches of the first switch (5) and the first magnetic field generating device (1). Selective operation of the switches allows the magnetic field generating device in the basic resonant circuit to be turned on in different ways. The basic resonant circuit is composed of the magnetic field generating device and two energy storage devices (2) and (3). The generated current pulses can be multiphase pulses, biphase pulses, or half-sine pulses, the selection of which depends on the selected time points when each switch is closed and opened. One way to turn on the magnetic field generating device is in a simultaneous mode, in which the switches connected in series with the selected magnetic field generating devices to be turned on are simultaneously turned off and closed. As a result, the equivalent total inductance of the turned-on magnetic field generating devices is equal to the sum of the inductances connected in parallel, and current pulses are generated simultaneously around the turned-on magnetic field generating devices. Another way to turn on the magnetic field generating device is in a non-simultaneous mode, in which the switches connected in series with the selected magnetic field generating devices to be turned on are turned off and closed at different time points based on the desired type and desired sequence of current pulses to be generated around each selected magnetic field generating device. Magnetic field generating devices can be the same or different in terms of their inductance, shape, size, orientation, and focal point. Figure 18The alternative implementation facilitates the application of magnetic stimulation to larger or different areas in a shorter time when more than one magnetic field generating device is applied simultaneously in a certain area, using magnetic field generating devices of different shapes, sizes, orientations, and focal points, or using more complex orientations and focal points. All switches can be implemented using any type of switching element or combination thereof, such as thyristors, diodes, IGBTs, MOSFETs, JFETs, and BJTs. Other switching elements consistent with the spirit of the invention can also be used. Figure 18 The implementation method can generate different types of current pulses, not limited to common types, but also extended to generate current pulses of any arbitrary waveform, which can be generated by adjusting the selected time points of each switch opening and closing accordingly.

[0099] refer to Figure 19 A schematic diagram of an alternative implementation of a magnetic stimulator is shown, which is used to independently operate multiple electrically oscillating resonant circuits sharing a common energy source (4). Figure 19 The implementation method is in Figure 1 The implementation further includes multiple electric resonant circuits. Each electric resonant circuit consists of two energy storage devices, a switch, and a magnetic field generating device connected in series. Each electric resonant circuit is coupled to an energy source and other electric resonant circuits by a switch configured to selectively disconnect the electric resonant circuit from the energy source and other electric resonant circuits. More specifically, Figure 19 The implementation method is in Figure 1 The implementation further includes multiple electric oscillation resonant circuits, each of which consists of two energy storage devices, a magnetic field generating device, and a switch (energy storage device C) connected in series. 2-2 +Switch 2-1+Magnetic field generating device L2+Energy storage device C 2-3 ..., energy storage device C n-2 +Switch n-1+Magnetic field generating device L n +Energy storage device C n-3 The circuit is composed of a power source (4) and other power sources (other resonant circuits), wherein each electric resonant circuit is coupled to the power source (4) and other power sources (other resonant circuits) by a switch (switch 1-2, switch 2-2, ..., switch n-2), the switch being configured to selectively disconnect the power source (4) and other power sources (other resonant circuits). Switches 1-2, 2-2, ..., n-2 allow selective connection to the corresponding energy storage device C. 1-2 C 2-2 ... C n-2 It allows for charging and enables independent operation of different electrically resonant circuits. Each electrically resonant circuit is similar to... Figure 1 The implementation of the electric resonant circuit shares the same characteristics, operation, and performance, and can be further extended to achieve [the desired result]. Figure 1 Optional implementation methods derived from the implementation method.

[0100] refer to Figure 20 The diagram shows an alternative implementation of a magnetic stimulator, which also includes a control unit (16) configured to control an energy source (4) and all switches to allow continuous adjustment and modulation of the output of the energy source, the amplitude of the current pulses, the repetition rate of the current pulses and the type of the current pulses, wherein the current pulses include current pulses flowing through two magnetic field generating devices (1) and (10). Figure 20 The implementation method is in Figure 11 The implementation further includes a control unit (16) coupled to the energy source (4), the first switch (5), the second switch (7), the third switch (9), and the fourth switch (11), and configured to control their operation. As an example, the control unit (16) is implemented in… Figure 11 In this embodiment, it can be used to control the energy source and switches in any other embodiment of the invention. Parameters that can be continuously adjusted and modulated include: the output of the energy source (4), the amplitude of the current pulse, the repetition rate of the current pulse, and the type of the current pulse, and the control unit is configured to perform this complex task. Continuous adjustment of the parameters includes, for example, changing their values ​​within a selected continuous range and / or at selected discrete values. Modulation of the parameters includes, for example, being able to define a selected duration of zero values ​​in the parameters, a selected duration of non-zero values ​​in the parameters, the repeatability of the selected durations of zero and non-zero values ​​in the parameters, and dynamic changes in the parameter values ​​and / or the durations of zero and non-zero values ​​based on different modes such as ramp-up, ramp-down, trapezoidal, sine wave, and combinations thereof. Continuous adjustment and modulation of the output of the energy source (4) is achieved by controlling the operation of the energy source (4) through the control unit (16). Continuous adjustment and modulation of the current pulse amplitude, the current pulse repetition rate, and the current pulse type are achieved by controlling the operation of all switches (5), (7), (9), and (11) through the control unit (16).

Claims

1. A magnetic stimulation device, comprising: A first magnetic field generating device, a first energy storage device, and a second energy storage device, wherein the first magnetic field generating device, the first energy storage device, and the second energy storage device are connected in series to form an electric oscillation resonant circuit; An energy source, which is coupled to the first energy storage device; as well as A first switch is used to allow charging of the first energy storage device from the energy source and to initiate electrical oscillation of the resonant circuit. After the electrical oscillation is initiated, the two energy storage devices repeatedly exchange charges through the first magnetic field generating device due to the electrical oscillation of the resonant circuit, and generate a time-varying magnetic field.

2. The magnetic stimulation device of claim 1, wherein, (a) The first energy storage device and the second energy storage device each include terminals, and (b) the voltage between the terminals of each of the two energy storage devices always has the same polarity.

3. The magnetic stimulation device of claim 1, wherein, During the charging of the first energy storage device from the energy source, no current flows through the first magnetic field generating device.

4. The magnetic stimulation device of claim 1, wherein, The energy source is protected from reverse voltage polarity.

5. The magnetic stimulation device of claim 1, wherein, (i) The magnetic stimulation device includes one or more additional switches, and (ii) after the electrical oscillation of the resonant circuit is initiated, the two energy storage devices repeatedly exchange charges without operating the first switch and the one or more additional switches.

6. The magnetic stimulation device according to claim 1, wherein, The first switch opens and closes at selectable times to stop the electrical oscillation of the resonant circuit.

7. The magnetic stimulation device according to claim 1, wherein, The position of the first switch is adapted to allow charging of the second energy storage device from the energy source and to initiate electrical oscillation of the resonant circuit.

8. The magnetic stimulation device according to claim 6 further includes a first resistor and a second switch connected in series, wherein the first resistor and the second switch are connected in parallel with the second energy storage device to selectively discharge either or both of the two energy storage devices.

9. The magnetic stimulation device according to claim 8 further includes a third switch and a second resistor connected in series, wherein the third switch and the second resistor connected in series are connected in parallel with the first switch and the magnetic field generating device connected in series.

10. The magnetic stimulation device according to claim 8 further includes a third switch and a second magnetic field generating device connected in series, wherein the third switch and the second magnetic field generating device connected in series are connected in parallel with the first switch and the first magnetic field generating device connected in series.

11. The magnetic stimulation device according to claim 8, further comprising a third switch and a second resistor connected in series, and a fourth switch and a second magnetic field generating device connected in series, wherein, The third switch and the second resistor, which are connected in series, and the fourth switch and the second magnetic field generating device, which are connected in series, are connected in parallel with the first switch and the first magnetic field generating device, which are connected in series.

12. The magnetic stimulation device according to claim 8, further comprising: A third energy storage device and a third switch are connected in series; the third energy storage device and the third switch are connected in parallel with the first magnetic field generating device and the second energy storage device, which are also connected in series; wherein the third energy storage device is further coupled to the energy source; and The fourth and fifth switches are configured to allow the energy source to selectively charge only the first energy storage device, only the third energy storage device, or both the first and third energy storage devices.

13. The magnetic stimulation device according to claim 1, wherein, The energy storage device is housed within a casing.

14. The magnetic stimulation device according to claim 1, wherein, Each energy storage device includes at least one capacitor, and the capacitances of the energy storage devices are equal.

15. The magnetic stimulation device according to claim 1, wherein, The capacitor for each energy storage device can be selected independently.

16. The magnetic stimulation device according to claim 1, further comprising a plurality of switches and a plurality of magnetic field generating devices, wherein, Each switch is connected in series with a magnetic field generating device to form a series branch, and all series branches are connected in parallel with each other and in parallel with the series branch of the first switch and the first magnetic field generating device.

17. The magnetic stimulation device according to claim 1 further comprises multiple electrical oscillation resonant circuits, each electrical oscillation resonant circuit consisting of two energy storage devices, a switch, and a magnetic field generating device connected in series, wherein, One of the two energy storage devices in each electric resonant circuit is coupled to the energy source and to the other electric resonant circuit by a switch.

18. The magnetic stimulation device of claim 11, further comprising a control unit, the control unit being configured to control the energy source and the switch to allow continuous adjustment and modulation of the output of the energy source, the amplitude of the current pulses, the repetition rate of the current pulses, and the type of the current pulses, wherein, The current pulse includes a current pulse flowing through the magnetic field generating device.

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