CN114849064A - Nerve stimulator and nerve stimulation system - Google Patents
Nerve stimulator and nerve stimulation system Download PDFInfo
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- CN114849064A CN114849064A CN202210791136.3A CN202210791136A CN114849064A CN 114849064 A CN114849064 A CN 114849064A CN 202210791136 A CN202210791136 A CN 202210791136A CN 114849064 A CN114849064 A CN 114849064A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/372—Arrangements in connection with the implantation of stimulators
- A61N1/378—Electrical supply
- A61N1/3787—Electrical supply from an external energy source
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/3605—Implantable neurostimulators for stimulating central or peripheral nerve system
- A61N1/36125—Details of circuitry or electric components
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/372—Arrangements in connection with the implantation of stimulators
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Abstract
The present invention provides a neurostimulator and a neurostimulation system, the neurostimulator comprises: the receiving coil is used for receiving wireless electric energy and comprises a first receiving coil and a second receiving coil, wherein the axes of the first receiving coil and the second receiving coil are arranged at an included angle; the rectifying circuit is coupled with the receiving coil and used for converting the first alternating current output by the receiving coil into direct current voltage; and the nerve stimulation circuit is coupled to the output end of the rectifying circuit and generates nerve stimulation current by using the direct-current voltage. The nerve stimulation system comprises the nerve stimulator and an external machine for providing wireless electric energy for the nerve stimulator. The electric energy transmission of the nerve stimulator and the nerve stimulation system is more stable, and the electric energy transmission efficiency is higher.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a nerve stimulator and a nerve stimulation system.
Background
Neuromodulation is a novel treatment mode for treating various diseases caused by abnormal nerve signals by stimulating nerves through current to block abnormal nerve signal transmission, such as chronic postoperative pain, Parkinson's disease, epilepsy, overactive bladder and the like. The existing stimulation treatment methods can be divided into two modes of percutaneous stimulation and implantable stimulation. The percutaneous stimulation mode has poor effect and long treatment time. The implanted stimulator has good effect but large operation wound and has various complicating disease risks. The miniaturized implantable stimulator can realize minimally invasive implantation, greatly reduces risks in operations and complications, and is an important development direction of a nerve stimulation treatment mode.
The nerve stimulator has obvious therapeutic effect on patients with overactive bladder by stimulating tibial nerves, can effectively improve bladder capacity of users, reduce toilet frequency and improve life quality. The miniaturized implantable stimulator comprises an external machine and a nerve stimulator, and the external machine charges the nerve stimulator in a wireless mode. The existing implanted stimulator has low electric energy transmission efficiency.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a neurostimulator and a neurostimulation system for solving the problem of low efficiency of electric energy transmission in the prior art.
To achieve the above and other related objects, the present invention provides a neurostimulator, which comprises:
the receiving coil is used for receiving wireless electric energy and comprises a first receiving coil and a second receiving coil, wherein the axes of the first receiving coil and the second receiving coil are arranged at an included angle;
the rectifying circuit is coupled with the receiving coil and used for converting the first alternating current output by the receiving coil into direct current voltage;
and the nerve stimulation circuit is coupled to the output end of the rectifying circuit and generates nerve stimulation current by using the direct-current voltage.
In an embodiment of the invention, an included angle between an axis of the first receiving coil and an axis of the second receiving coil is 30 to 120 °.
In an embodiment of the invention, an axis of the first receiving coil and an axis of the second receiving coil are orthogonally disposed.
In an embodiment of the invention, the rectifier circuit includes a first rectifier bridge and a second rectifier bridge, an input terminal of the first rectifier bridge is coupled to the first receiving coil, an input terminal of the second rectifier bridge is coupled to the second receiving coil, and a negative terminal of an output terminal of the first rectifier bridge is connected to a positive terminal of an output terminal of the second rectifier bridge; and the positive pole of the output end of the first rectifier bridge and the negative pole of the output end of the second rectifier bridge are used as the output ends of the rectifier circuit to output the direct-current voltage.
In an embodiment of the present invention, the neural stimulation circuit includes:
the internal power supply circuit is coupled to the output end of the rectifying circuit and converts the direct-current voltage into second alternating current;
and the nerve stimulation electrode group is coupled to the output end of the internal power supply circuit and used for electrically stimulating nerves by utilizing the second alternating current discharge.
In an embodiment of the present invention, the internal power supply circuit includes:
the voltage division circuit is coupled to the output end of the rectification circuit and divides the direct-current voltage and then outputs gear control voltage;
the amplifying circuit is coupled to the output end of the voltage dividing circuit and outputs the stepping direct current according to the gear control voltage;
and the inverter circuit is coupled to the output end of the amplifying circuit and converts the graded direct current into the second alternating current.
In an embodiment of the present invention, the voltage dividing circuit includes a plurality of voltage dividing resistors connected in series with each other, and a gear selecting switch tube for short-circuiting a part of the voltage dividing resistors, an on-off state of the gear selecting switch tube is controlled by a gear shifting signal, and the gear shifting signal is included in the wireless power.
In an embodiment of the present invention, the amplifying circuit includes:
the emitter of the first PNP type triode is connected with the anode of the output end of the direct current voltage, and the base of the first PNP type triode is controlled by the gear control voltage;
and the current limiting resistor is connected between the collector of the first PNP type triode and the inverter circuit.
In an embodiment of the present invention, the inverter circuit is a full-bridge inverter, the full-bridge inverter includes a plurality of frequency control switching tubes, an on/off state of the frequency control switching tubes is controlled by a discharge frequency control signal, and the discharge frequency control signal is included in the wireless power; the nerve stimulation electrode group comprises a first electrode and a second electrode which are matched with each other, and the nerve stimulation circuit further comprises a direct current blocking capacitor which is connected with the first electrode and/or the second electrode in series.
To achieve the above and other related objects, the present invention also provides a neurostimulation system, including the neurostimulator, and an external machine for providing wireless electric energy to the neurostimulator, the external machine including:
the power supply device is used for supplying high-frequency alternating current;
and the transmitting coil transmits wireless electric energy by using the high-frequency alternating current, and the wireless electric energy is transmitted between the transmitting coil and the receiving coil in a magnetic coupling resonance mode.
As described above, the neurostimulator and the neurostimulation system of the present invention have the following beneficial effects: the electric energy transmission efficiency is higher, which is beneficial to obtaining larger range of stimulating current and frequency and enhancing the treatment effect.
Drawings
Fig. 1 is a block diagram showing the structure of a neurostimulation system of the present invention.
Fig. 2 is a schematic diagram of the rectifier circuit of the present invention.
Fig. 3 shows a test circuit diagram of a rectifier circuit connected according to the prior art.
Fig. 4 shows a test circuit diagram of a rectifier circuit connected in accordance with the present invention.
FIG. 5 is a diagram showing the test result of the AC voltage at the input end of the conventional rectifying circuit of the test circuit in FIG. 3.
FIG. 6 is a diagram showing the test result of the AC current at the input end of the conventional rectifier circuit in the test circuit of FIG. 3.
FIG. 7 is a diagram showing the DC test result of the output terminal of the conventional rectifier circuit in the test circuit of FIG. 3.
FIG. 8 is a graph showing the test result of the AC voltage at the input end of the rectifying circuit of the present invention in the test circuit of FIG. 4.
FIG. 9 is a graph showing the test result of the AC current at the input end of the rectifying circuit of the present invention in the test circuit of FIG. 4.
FIG. 10 is a diagram showing the DC test result at the output terminal of the rectifying circuit of the present invention of the test circuit of FIG. 4.
FIG. 11 is a schematic diagram of the internal power supply circuit of the present invention.
Description of the element reference
1. A nerve stimulator; 11. a receiving coil; 12. a rectifying circuit; 121. a first rectifier bridge; 122. a second rectifier bridge; 123. a filter circuit; 13. an internal power supply circuit; 131. a voltage dividing circuit; 132. an amplifying circuit; 133. an inverter circuit; 14. a set of neurostimulation electrodes; 141. a first electrode; 142. a second electrode; 2. an external machine; 21. a power supply device; 22. and a transmitting coil.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The existing nerve stimulator powered in a wireless mode is limited by transmission efficiency, stimulation current and frequency are limited, and stimulation effect is poor.
Referring to fig. 1 to 11, the present invention provides a neurostimulator 1, wherein the neurostimulator 1 comprises a receiving coil 11, a rectifying circuit 12 and a neurostimulation circuit.
The neurostimulator 1 enters the human body during the treatment process and stimulates the nerve through electric discharge.
The receiving coil 11 is used for receiving wireless power and comprises a first receiving coil L1 and a second receiving coil L2, wherein the axes of the first receiving coil L1 and the second receiving coil L2 are arranged at an included angle. When the existing nerve stimulator is used, the positions of the external machine 2 and the nerve stimulator 1 need to be aligned to obtain higher energy transmission efficiency, and if the external machine 2 provides a plurality of wireless electric energy emitting sources, the energy of some emitting sources cannot be fully utilized. The receiver coil 11 of the present invention may be provided with other receiver coils in addition to the first receiver coil L1 and the second receiver coil L2, and the shape and arrangement of the receiver coils are not limited.
The rectifying circuit 12 is coupled to the receiving coil 11 and is configured to convert the alternating current output by the receiving coil 11 into a direct current voltage.
The neural stimulation circuit is coupled to the output end of the rectifying circuit 12, and generates a neural stimulation current by using the direct-current voltage. The nerve stimulation circuit can adopt the existing electric energy conversion circuit, and the embodiment does not limit the type of the nerve stimulation current and can be direct current or alternating current.
According to the nerve stimulator, the receiving coil 11 comprises the first receiving coil L1 and the second receiving coil L2, the first receiving coil L1 and the second receiving coil L2 face different directions, the angle range of a magnetic field received by the receiving coil 11 can be greatly improved, the problem of direction sensitivity of the receiving coil 11 is solved, and the transmission efficiency of wireless electric energy is improved.
Specifically, the included angle between the axis of the first receiving coil L1 and the axis of the second receiving coil L2 is 30-120 degrees, and the included angle between two adjacent receiving coils can be set according to the size and shape of the space in the nerve stimulator 1. Further, the axis of the first receiving coil L1 and the axis of the second receiving coil L2 are orthogonally arranged to achieve the best power transmission efficiency.
In the present embodiment, the rectifying circuit 12 includes a first rectifying bridge 121 and a second rectifying bridge 122, an input end of the first rectifying bridge 121 is coupled to the first receiving coil L1, an input end of the second rectifying bridge 122 is coupled to the second receiving coil L2, and a negative electrode of an output end of the first rectifying bridge 121 is connected to a positive electrode of an output end of the second rectifying bridge 122; the positive electrode of the output terminal of the first rectifier bridge 121 and the negative electrode of the output terminal of the second rectifier bridge 122 serve as the output terminals of the rectifier circuit 12 to output a dc voltage.
The connection mode of the rectifying circuit 12 of the invention is different from the direct current voltage generated by the output end of the traditional rectifying bridge, and can obviously improve the transmission efficiency of wireless energy and shorten the charging time.
Fig. 3 is a test circuit diagram for connecting the output terminal of the first rectifier bridge 121 and the output terminal of the second rectifier bridge 122 to the test load R2, respectively, in a conventional manner. Fig. 4 is a circuit diagram of the connection of a test load R2 in the manner of fig. 1 in accordance with the present invention. The input end of the test circuit is a 6.78MHz sine wave, and the transmitting power is 15.6W. The inductance of the receiving coil 11 is 7uH, the internal resistance is 1 ohm, and the coil coupling coefficient is 1: 2.
as can be seen from FIGS. 5 to 7, the average voltage at the input end of the conventional rectifier circuit
19.107V, average current of input terminal
The average current of the load R2 was tested at 819.87mA
56.086 mA.
As can be seen from FIGS. 8 to 10, the average voltage at the input end of the rectifying circuit of the present invention
Average current of input terminal is 21.159V
The average current of the load R2 was tested at 737.16mA
70.116 mA.
Calculating the transmission efficiency according to the following formula based on the test result
：
The transmission efficiency of the prior art can be obtained
30.12%, transmission efficiency of the improved rectifier circuit using the invention
47.28%, the results of both tests are statistically as follows:
the invention increases the transmission efficiency of electric energy by improving the rectifying circuit 12, and the improvement of the transmission efficiency further accelerates the wireless charging speed of the nerve stimulator. The practice of researchers shows that the nerve stimulator shortens the charging time from 3 hours to 2 hours.
In order to improve the purity of the dc voltage and reduce the ripple component, in this embodiment, the neurostimulator further includes a filter circuit 123 coupled to the output terminal of the rectifier circuit 12, the filter circuit 123 includes an anti-reverse diode D1 and a filter capacitor C1, an anode of the anti-reverse diode D1 is connected to the anode of the output terminal of the first rectifier bridge 121, one end of the filter capacitor C1 is connected to the cathode of the anti-reverse diode D1, and the other end of the filter capacitor C1 is connected to the cathode of the output terminal of the second rectifier bridge 122.
In order to further enhance the energy receiving efficiency of the neurostimulator, in the embodiment, a first tuning capacitor C2 is connected between the first receiving coil L1 and the input end of the first rectifier bridge 121, and a second tuning capacitor C3 is connected between the second receiving coil L2 and the input end of the second rectifier bridge 122, so as to match the resonance of the receiving coil 11 to the resonance point of 6.78 MHz.
Specifically, in the present embodiment, the neurostimulation circuit comprises an internal power supply circuit 13 and a neurostimulation electrode group 14. The internal power supply circuit 13 is coupled to the output end of the rectifying circuit 12, and converts the dc voltage into a second ac voltage. The nerve stimulation electrode set 14 is coupled to the output end of the internal power supply circuit 13, and is used for stimulating the nerve by using the second alternating current discharge.
Referring to fig. 11, in the present embodiment, the internal power supply circuit 13 includes a voltage divider circuit 131, an amplifier circuit 132, and an inverter circuit 133.
The voltage divider circuit 131 is coupled to the output end of the rectifier circuit 12, and divides the dc voltage to output the gear control voltage. The amplifying circuit 132 is coupled to the output end of the voltage dividing circuit 131, and outputs the stepped dc power according to the step control voltage. The inverter circuit 133 is coupled to the output terminal of the amplifying circuit 132, and converts the stepped dc power into a second ac power.
Specifically, in the present embodiment, the voltage dividing circuit 131 includes a plurality of voltage dividing resistors connected in series, and a gear selecting switch for short-circuiting a part of the voltage dividing resistors. In fig. 11, four voltage dividing resistors are provided, which are a first voltage dividing resistor R2, a second voltage dividing resistor R3, a third voltage dividing resistor R4 and a fourth voltage dividing resistor R5, which are connected in series in sequence from the positive electrode of the dc voltage to the ground. The three gear selection switch tubes are respectively a first gear selection switch tube Q1 connected in parallel with the fourth voltage dividing resistor R5, a second gear selection switch tube Q2 connected in parallel with the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5, and a second gear selection switch tube Q3 connected in parallel with the second voltage dividing resistor R3, the third voltage dividing resistor R4 and the fourth voltage dividing resistor R5. The node voltage between the first voltage-dividing resistor R2 and the second voltage-dividing resistor R3 serves as a step control voltage. Different voltage division ratios can be obtained by controlling the on-off of each gear selection switch tube, so that different gear control voltages are output, and the nerve stimulation discharge currents with different gear sizes are output after the gear control voltages are amplified. The on-off state of the gear selection switch tube is controlled by a gear shifting signal, and the gear shifting signal is contained in the wireless electric energy. The specific way of transmitting the shift signal from the external machine to the neurostimulator can adopt the existing signal modulation technology, and is not the improvement focus of the embodiment.
In this embodiment, the amplifying circuit 132 includes a first PNP transistor Q4 and a current limiting resistor R6. The emitter of the first PNP transistor Q4 is connected to the positive terminal of the dc voltage output terminal, and the base is controlled by the shift control voltage. The current limiting resistor R6 is connected between the collector of the first PNP type triode and the inverter circuit to prevent the damage of the overlarge current to the human tissue.
Specifically, in the embodiment, the inverter circuit 133 is a full-bridge inverter, the full-bridge inverter includes a plurality of frequency control switching tubes (refer to Q6, Q7, Q8, and Q9 in fig. 11), the on-off states of the frequency control switching tubes are controlled by the discharge frequency control signal, and the discharge frequency control signal is included in the wireless power. The specific way of transmitting the discharge frequency control signal from the external machine 2 to the neurostimulator 1 can adopt the existing signal modulation and demodulation technology, and is not the improvement focus of the embodiment. The neurostimulation electrode group 14 comprises a first electrode 141 and a second electrode 142 which are mutually matched. The on-off of the switching tube is controlled by controlling the frequency to perform alternating current discharge between the first electrode 141 and the second electrode 142.
Further, in the present embodiment, the neurostimulation circuit further includes a dc blocking capacitor (not shown) connected in series with the first electrode 141 and/or the second electrode 142 to ensure that the output is a pure ac power, thereby avoiding human body injury.
Referring to fig. 1 and 2, the present invention further provides a neurostimulation system, which includes the neurostimulator 1 of any of the above embodiments, and an external device 2 for providing wireless electric energy to the neurostimulator 1. The external machine 2 is a wearable device, is worn on the ankle by the patient during treatment, and supplies power to the nerve stimulator 1. The external machine 2 supplies power to the nerve stimulator 1 in a wireless transmission mode, so that the nerve stimulator 1 is independent of a battery, the size of the nerve stimulator 1 is reduced by more than 50%, minimally invasive implantation can be realized, and the risks of sequelae and complications of the implantation operation are greatly reduced.
Specifically, in the present embodiment, referring to fig. 1, the external machine 2 includes a power supply device 21 and a transmitting coil 22. The power supply device 21 is used to supply a high-frequency alternating current. The transmitting coil 22 transmits wireless power using high-frequency alternating current. To further ensure the power transmission efficiency, wireless power is transmitted between the transmitting coil 22 and the receiving coil 11 by means of magnetic coupling resonance.
In conclusion, the invention reduces the volume of the nerve stimulator by arranging the receiving coil of the wireless electric energy in the nerve stimulator, and is beneficial to reducing the operation trauma. The problem that the nerve stimulator is sensitive to the electric energy transmission direction is solved through the improvement of the butt joint take-up coil. By improving the rectification circuit, the transmission efficiency of the wireless electric energy is further improved, the power and the frequency of stimulation output are improved, the defects of over-small stimulation current and low output power in the prior art are effectively overcome, the stimulation energy and the frequency are favorably improved, and the industrial utilization value is higher.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A neurostimulator, characterized in that it comprises:
the receiving coil is used for receiving wireless electric energy and comprises a first receiving coil and a second receiving coil, wherein the axes of the first receiving coil and the second receiving coil are arranged at an included angle;
the rectifying circuit is coupled with the receiving coil and used for converting the first alternating current output by the receiving coil into direct current voltage;
and the nerve stimulation circuit is coupled to the output end of the rectifying circuit and generates nerve stimulation current by using the direct-current voltage.
2. The neurostimulator of claim 1, wherein the angle between the axis of the first receive coil and the axis of the second receive coil is 30 ° -120 °.
3. The neurostimulator of claim 1, wherein the axis of the first receive coil and the axis of the second receive coil are disposed orthogonally.
4. The neurostimulator according to claim 1, wherein the rectifying circuit comprises a first rectifying bridge and a second rectifying bridge, an input end of the first rectifying bridge is coupled to the first receiving coil, an input end of the second rectifying bridge is coupled to the second receiving coil, and a negative pole of an output end of the first rectifying bridge is connected with a positive pole of an output end of the second rectifying bridge; and the positive pole of the output end of the first rectifier bridge and the negative pole of the output end of the second rectifier bridge are used as the output ends of the rectifier circuit to output the direct-current voltage.
5. The neurostimulator of claim 1, wherein the neurostimulation circuitry comprises:
the internal power supply circuit is coupled to the output end of the rectifying circuit and converts the direct-current voltage into second alternating current;
and the nerve stimulation electrode group is coupled to the output end of the internal power supply circuit and used for electrically stimulating nerves by utilizing the second alternating current discharge.
6. The neurostimulator of claim 5, wherein the internal power supply circuitry comprises:
the voltage division circuit is coupled to the output end of the rectification circuit and divides the direct-current voltage and then outputs gear control voltage;
the amplifying circuit is coupled to the output end of the voltage dividing circuit and outputs the stepping direct current according to the gear control voltage;
and the inverter circuit is coupled to the output end of the amplifying circuit and converts the graded direct current into the second alternating current.
7. The neurostimulator according to claim 6, wherein the voltage dividing circuit comprises a plurality of voltage dividing resistors which are connected in series with each other, and a gear selecting switch tube for short-circuiting part of the voltage dividing resistors, the on-off state of the gear selecting switch tube is controlled by a gear shifting signal, and the gear shifting signal is contained in the wireless power.
8. The neurostimulator of claim 6, wherein the amplification circuit comprises:
the emitter of the first PNP type triode is connected with the anode of the output end of the direct current voltage, and the base of the first PNP type triode is controlled by the gear control voltage;
and the current limiting resistor is connected between the collector of the first PNP type triode and the inverter circuit.
9. The neurostimulator according to claim 6, wherein the inverter circuit is a full-bridge inverter, the full-bridge inverter comprises a plurality of frequency control switch tubes, the on-off state of the frequency control switch tubes is controlled by a discharge frequency control signal, and the discharge frequency control signal is contained in the wireless power; the nerve stimulation electrode group comprises a first electrode and a second electrode which are matched with each other, and the nerve stimulation circuit further comprises a direct current blocking capacitor which is connected with the first electrode and/or the second electrode in series.
10. A neurostimulation system comprising a neurostimulator of any of claims 1-9, and an external machine providing wireless electrical energy to the neurostimulator, the external machine comprising:
the power supply device is used for supplying high-frequency alternating current;
and the transmitting coil transmits wireless electric energy by using the high-frequency alternating current, and the wireless electric energy is transmitted between the transmitting coil and the receiving coil in a magnetic coupling resonance mode.
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