• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a device for generating alternating magnetic fields for inducing eddy currents in an organism for the treatment of particular tinnitus, comprising a head part (1), a power source (3), a controller (4), one or more coils (2a, 2b) provided that the at least one coil (2a, 2b) has at least two layers (31, 32) with different winding. As a result, alternating magnetic fields for inducing eddy currents in an organism for the treatment of tinnitus in particular can be produced more effectively.
    公开号:AT518114A1
    申请号:T430/2016
    申请日:2016-09-20
    公开日:2017-07-15
    发明作者:Neuwirth Gerald
    申请人:Neuwirth Gerald；
    IPC主号:
    专利说明:

    The present invention relates to a device for generating alternating magnetic fields. More particularly, the present invention relates to an apparatus for generating alternating magnetic fields for inducing eddy currents in an organism for treating, in particular, tinnitus, comprising - a head portion, - a power source, - a controller, - one or more coils.
    The present invention relates to a device for generating alternating magnetic fields for inducing eddy currents in an organism and to a use of such a device. The device for generating and emitting alternating magnetic fields is formed with an adjustable, low frequency with pulses, steep edges and harmonic components.
    Different devices for generating and emitting alternating electromagnetic fields for the treatment and examination of organisms are known, it being generally assumed that the penetration depth of such alternating electromagnetic fields depends on the frequency. WO 2011/009807 describes a tinnitus therapy device as a combination between an applicator for low-frequency electromagnetic fields (therapy) and an electroencephalo-graphy (EEG) as a source for the evaluation of the effect of the therapy (diagnosis). In the patent application WO 2011/009807 there are no indications as to how the iron core coils of the applicators are wound. WO 1999/04854 describes a device for generating alternating magnetic fields for inducing eddy currents in an organism. In the patent application WO 1999/04854, again, there are no indications as to how the iron core coils of the applicators are wound.
    Further similar devices for the treatment of tinnitus of the type mentioned above can be found, for example, in DE 103 10 084 A1 or EP 0 537 385 A1, again disclosing no details concerning a winding of coils or solenoids used in such devices.
    It is an object of this invention to propose a new and better device which makes it possible to more effectively generate alternating magnetic fields for inducing eddy currents in an organism for the treatment of, in particular, tinnitus.
    To solve this problem, a device of the type mentioned is essentially characterized in that the at least one coil has at least two layers with different winding.
    The present invention now aims to provide a device for generating alternating magnetic fields for inducing eddy currents in an organism, with which eddy currents can be generated in a structurally simple manner targeted and safe in an organism, by the irritation caused by the autonomic nervous system to effect a targeted influence of possible charge shifts in the cell membranes or to reduce or mitigate existing blockages. Since magnetic alternating fields of an adjustable, low frequency are emitted by the device according to the invention, a simple adaptation to the different sensitivity of different organisms is possible. It was found that the sensitivity is maximal at the frequency which agrees with the EEG-α rhythm of the person to be treated. By the inventively chosen, low field strengths is further ensured that in unproblematic and absolutely safe handling the desired effects in terms of inducing eddy currents in the organism can be achieved. In this case, pulses are generated in the form of waves with pulsating, steep flanks with upper shaft shares and delivered. These pulses induced and delivered to the organism optimally excite and support natural pulses present in the organism when the frequency of the externally applied alternating magnetic fields is synchronized with these self-pulses. This supports the targeted irritation of the autonomic nervous system.
    An essential feature of the device according to the invention is that the at least one coil has at least two layers with different winding. In contradiction to conventional coils on which the wire is wound in regularly superimposed layers, the at least one coil of the device according to the invention is formed with at least two layers with different winding. Thanks to this special winding process, the alternating magnetic field acquires special properties in connection with the induction of eddy currents in an organism. The different coils may be wound in the same pattern, which allows the automation or the reproducibility of the production of the coils. The coils are designed, for example, for the generation of a magnetic field up to 2 mT.
    The inventively provided training of at least one coil with at least two layers with different winding coils can be made or provided, which can produce much better steep harmonic pulses. Such coils for generating steep harmonic-containing pulses show significantly better effects for the treatment of tinnitus in particular than normally wound coils.
    According to a particularly preferred embodiment, the invention provides that the at least one coil has at least one layer with orthocyclic winding and at least one layer with helical winding. By providing such a design of the coil with at least one layer with orthocyclic winding and at least one layer with helical winding, the above-mentioned steep, wavy wave pulses can be achieved correspondingly reliable in the operated in the extremely low frequencies coil.
    In order to improve the intended effect of specially trained pulses, it is proposed according to a further preferred embodiment of the invention that the at least one coil has a plurality of adjacent layers each having ortho-cyclical and helical winding. For a particularly reliable and precise positioning of the coils for generating alternating magnetic fields for inducing eddy currents in an organism at the desired locations for treatment of tinnitus or positions, it is proposed according to a further preferred embodiment of the invention that the at least one coil in or on a headset, in particular in or on a headphone shell is arranged.
    To achieve the eddy currents to be induced at the desired locations, in particular for the treatment of tinnitus, it is furthermore proposed according to a further preferred embodiment that each ear is assigned two coils at different height positions. The coils to be assigned to each ear are hereby placed or positioned in the area of the cortex and of the mastoid, the cortex coils lying, for example, in the upper region of the earpiece of a headphone while the coils for the mastoid on the lower side of the earpiece of the head part or earpiece Headphone in particular to be mounted slightly obliquely. The inventively proposed special arrangement of each ear to be assigned coils at different height positions ensures that the force field generated by the electromagnetic fields also reaches cells inside the body to achieve the desired effect.
    In this context, it is proposed according to a further preferred embodiment that the coils associated with each ear are operated in push-pull. By operating the coils associated with each ear in push-pull action, electric charges are acted upon by the generated electromagnetic alternating fields, and such stationary charges are set in motion in the hearing center, in particular in time with their own vibration. By operating the coils in push-pull the pulsating alternating electromagnetic field superimposed weak ringing signals are generated, which are therapeutically significant, since they can stimulate in particular the information exchange between the cells.
    A particularly simple and structurally easy to manufacture embodiment of the invention is preferably designed such that the device comprises an astable multivibrator with a transistor and at least one bipolar iron core coil for delivering the alternating fields. The generation and delivery of the alternating magnetic fields can be produced with known elements in a relatively simple form and at low cost. The device according to the invention can be used in particular for the treatment of ear noises, sleep disorders, headaches, migraine, cervical and spinal syndromes, nervousness and circulatory disorders. It has been found that low-effective areas of the alternating magnetic fields are selected with an adjustable, low frequency such that the frequency is below 20 Hz, in particular between 3 and 15 Hz. In general, a subdivision into two major treatment-specific areas has been found, with a frequency range between 3 and 6 Hz generally calming and anticonvulsant. In contrast, the frequency range between 8 and 15 Hz is predominantly stimulating, analgesic and stabilizing. Furthermore, it can be assumed that frequencies below 8 Hz essentially cause blood vessel dilations, while frequencies above 12 Hz generally lead to blood vessel constrictions, with the above-mentioned high frequency range only being applied when lower frequencies are ineffective. For a further improvement of the adaptation of the frequency to be set to the desired effect, it is proposed according to a further preferred embodiment that a particular digital wobble of the frequency by ± 50%, preferably ± 25%, preferably ± 10%, be provided. For a structurally simple construction and in particular for the construction of devices which can be operated independently of a mains voltage supply, it is additionally proposed according to a further preferred embodiment that a low-voltage direct voltage source, in particular a 9 volt direct voltage source, is provided as the voltage supply. In this way, mobile and portable devices can also be formed in a simple manner independently of a mains supply by providing a battery as a DC voltage supply, which is advantageous, in particular, in the application for the treatment of tinnitus. As a power source, rechargeable batteries can be installed very well.
    As already indicated above, the device according to the invention can be used for the treatment of a multiplicity of application areas, the device being accommodated in a headphone, in particular for the treatment of ear noises or tinnitus, as has been stated above, wherein in each loudspeaker of the headphone one bipolar iron core coil is included. Optionally, however, a training with only a bipolar iron core coil is conceivable if, for example, ear noises occur only in one ear. A device according to the invention can easily be realized in such a headphone, if necessary with a correspondingly small-sized auxiliary device, so that overall an easily applicable and replaceable construction can be achieved.
    In an embodiment variant, the device according to the invention comprises an input device and a display device. As indicated above, is an essential feature of the device according to the invention in the availability of adjustable ble, low frequencies for the treatment of different indications and to achieve the best possible match of the alternating magnetic fields and the person to be treated inherent intrinsic impulses. In this context, it is proposed that the device has a plurality of switches or selection means for setting a desired frequency, duration of the therapy, start / stop of the therapy. In this way, an adaptation to desired frequency ranges as well as the most exact possible agreement with the frequency of the intrinsic impulses of the person to be treated can be achieved in a simple manner.
    In an embodiment variant, the mastoid and cortex coils are individually electrically driven and arranged so that the respective signals are shifted in time by an arbitrarily selectable value. For example, a displacement of the signals by half a period between the mastoid coil and the cortex coil on the one side of the head has particular healing effects. For a further simplification in the handling and monitoring of the device according to the invention, it is further preferred for the device to have at least one display, in particular an LCD display or a retina display. For further automation of the use of the device according to the invention, it is proposed that the device has a timer, as corresponds to a further preferred embodiment of the invention.
    In one embodiment, the device according to the invention comprises two or more speakers for combining the magnetic field therapy with a sound therapy. Tinnitus-specific sound sequences, soothing pieces of music, maskers or noisers are output via the loudspeakers. For example, the speakers are connected to a music player via an audio jack or via a contactless data interface such as Bluetooth. The control of music playback via a
    Bluetooth enabled device, such as a smartphone. The volume and the titles can be displayed directly by the display device and controlled by the input device. Alternatively, a corresponding selection can be made with an additional, small remote control.
    In one embodiment variant, the device according to the invention comprises regions which can be heated and are in contact with or in the vicinity of the skin. These heated areas additionally promote blood circulation. This compensates for tension and cramps in the ear area. The heating takes place for example via radiators in the infrared range.
    In one embodiment variant, the device according to the invention comprises a data interface, for example a wire interface such as an audio jack for the connection of a music player or an external controller for the operation or maintenance of the device according to the invention, or for example a wireless interface such as Bluetooth for the connection of one smartphone. In one embodiment variant, the device according to the invention comprises an interface with which the device can be connected with FitBit wristbands and smart watches and a data exchange can be carried out. In an alternative embodiment, the device according to the invention comprises an interface with which the device is connected to IoT (Internet of Things), i. connect to the network. For this purpose, an RFID transponder is integrated into the circuit.
    In one embodiment variant, the device according to the invention comprises a memory module, for example a memory card, for example an SD card for storing relaxation and tinnitus of healing music, which is output via the loudspeakers. Measurement data or protocols about the therapy can also be stored on the memory card for later evaluation.
    In one embodiment, some functions of the device according to the invention are outsourced to a base part. In such an embodiment, the head part comprises, for example, the bracket, the shells, the applicators, the speakers, while the base part comprises the remaining components, such as the power source, the controller, the display device, the input device, etc. This variant is particularly advantageous if certain components are difficult, space consuming and difficult to integrate in the headboard. The connection between the head and the base part, for example via a cable or via a contactless interface such as Bluetooth. Certain functions can also be integrated in the sense of an app in a smartphone. In this case, a device-specific app is loaded from an app store and installed on the smartphone. As input and display device for the device according to the invention those of the smartphone can be used. Such a variant leads to savings for the patient. The communication between the smartphone and the device according to the invention takes place via a contactless interface, for example via Bluetooth, and allows an exchange of data in both directions, namely from the smartphone to the device according to the invention for control purposes, and from the device according to the invention to the smartphone for diagnostic purposes.
    The invention will be explained in more detail with reference to embodiments schematically illustrated in the accompanying drawings. In this show:
    Fig. 1 is a schematic representation of a first embodiment of a device according to the invention;
    FIG. 2 shows a schematic circuit arrangement of the embodiment according to FIG. 1; FIG.
    Fig. 3 in a similar to Figure 1 representation of a modified embodiment of a device according to the invention; and
    Fig. 4 in an enlarged scale a partially schematic representation of a coil with layers each having different winding.
    The device according to the invention will be described in detail below with reference to the figures.
    The device according to FIG. 1 consists, for example, of a head lift 1, also called a head part, with a spring-loaded bracket and two shells which cover the ears. High quality material is used for the headboard to ensure maximum comfort during therapy. All materials are tested for skin compatibility. In the shells are each an applicator 2, for example, an iron core coil 2a. These are intended for the treatment of mastoid bones and are poured directly into the back of the shell. The mastoid bone is a domed bone; he is just behind the ear. Other applicators, such as iron core coils 2b for the cortex are also poured directly into the bracket 1, so that they can not be moved during use. The cortex (also called cortex or cerebral cortex) is the outer, nerve cell-rich layer of the cerebrum. In one embodiment, the iron core coils are cast in riders, which are attached to the bracket 1 and moved until a certain position of the cortex is reached. Powered on the bracket 1 or in the shells is a power source 3, such as a battery or a rechargeable battery. Powered in the shell or in the bracket is a controller 4 and an unillustrated signal amplifier for amplifying the applicator signals. At the same time, this electronics monitors whether the applicators actually work. This is done by measuring the current flow to the headboard.
    In Fig. 1, a display 5, an input device 6, a speaker 7 and heat pads or hot areas 8 in or on each earpiece 19 of the headphone 1 are also indicated.
    The apparatus includes a controller which will be described in detail below with reference to FIG. 2. The electronics of
    Control is to be based on state-of-the-art SMT technology, which results in a significant cost advantage in the production. In one embodiment, the electronics of the controller, including display and input device 6 in the head part of the device according to the invention is supplied, so that the entire device of the invention allows a completely wireless therapy, which contributes to the reduction of stress.
    The controller 4 of the device according to the invention comprises the following components: Controller 11: For example of the ATMEGA 16-P type from Atmel with 10 Kbytes of internal program memory, 2 K of RAM and 28 bytes of EEPROM. The program memory is executed as Flash and thus up to 10'000 times erasable and writable. - EEPROM 12: The following data is stored in the EEPROM: up to 10 waveforms - 256 bytes (2'560 bytes), operating hours counter (8 bytes), patient data (256 bytes), time programs (256 bytes). This results in a total of 3'080 bytes. To be prepared for the future, a 64 Kbit serial EEPROM is used (e.g., Atmel AT24C64). RTC 13: With the RTC (Real Time Clock), it is possible to log and retrieve the exact times and dates of each individual treatment in the memory module 10.
    Reset 14: Supervisory Circuit, monitors the supply voltage and supplies a defined RESET signal for the processor unit if the defined limit value is undershot. This in both the power-up case and brown-out. In addition, the device switches the supply for the RTC device in the off state of the device. Clock 15: clock frequency of 8 MHz for the clock supply of the controller 11. Due to the necessary accuracy of the clock frequency, a ceramic resonator is used here. - Display (display device 5): A Retina HD display is preferred. The operation is done by means of own app. The complete control 4, 24 of the individual components is also done with own apps. But it is also possible to integrate foreign tinnitus apps (masker, trainer or noiser) into the operation. - USB connector: This connector is for charging the built-in battery. Furthermore, the USB port can be used for program updates and data exchange with a PC. D / A converter 16: The D / A converter generates the output signal to the applicator according to a waveform stored in the EEPROM. The resolution of the amplitude as well as the frequency should be at 256 (= discrete-time and amplitude-discrete output). PWM output: In this case, a PWM signal is supplied by the controller 11. Amplitude definition via DA converter.
    Output Amplifier 17: Amplifies the applicator signal provided by the DA-Converter to the maximum amplitude while monitoring whether the applicators (head section) actually work. This is done by measuring the current flow (signal APPL OK) to the header, which is measured via the internal analog-to-digital converter of the controller 11 and evaluated accordingly. Based on this measurement, an evaluation of the applicator function is possible. The applicators selected by the app are addressed with the same signals.
    Bluetooth: The controller 4, 24 now has a Bluetooth module. It is now possible by means of a smartphone or Bluetooth-enabled player to output music or the tinnitus app in the tinnitus device on the headboard. The controller 4, 24 can be done via the smartphone. - Audio jack: A non-compatible smartphone or player can also be connected via the audio jack and the tinnitus trainer, masker or noiser can be output via the headpiece. - SD memory card: With an SD memory card it is possible to play in your own relaxation or tinnitus music and output it via the head unit. - Audio: The audio block (MS6331G) is used for this. The volume and the tracks can be controlled directly from the display 5, 25 (display device) or smartphone.
    Voltage conditioning 18: The device is supplied with an internal battery. The following voltages are processed: VLogik: Supply voltage for the logic part and
    Bluetooth Module 3.3 V. VAppl: Applicator voltage for the output amplifier. VRTC: Backup voltage for RTC 13 and real time. In addition, the voltage conditioning 18 also monitors the battery voltage (LOWBAT) and supplies it to the AD converter of the controller 11. It measures the voltage, so that it can be pointed out early on a necessary loading. The development is carried out with consideration of energy-saving components. - Infrared heat: Infrared heat pads 8 are incorporated into the earpads (shell). These also promote blood circulation. This also compensates for tension and cramps in the ear area. - Applicator coils: These coils for the mastoid bone are poured directly into the rear of the shell. The coils for the cortex are also poured directly into the bracket 1, 21, so that they can not be moved during use. A high quality headboard is used to ensure the highest comfort during therapy. All materials are tested for skin intolerance.
    The application includes the following functions:
    Applicator signal: Ten waveforms can be stored, simultaneously, superimposed or combined. Selection is made using the display. - Maximum frequency of the applicator 200 Hz. - Important parts of the frequency is an additional wobble.
    These frequencies are selected in different programs.
    Operating hours counter from 0 - 9999 (storage and
    Display in 1/10 hours) and display. - Condition monitoring battery (LOWBAT) and display.
    Condition monitoring applicator (APPLOK) and display in
    Display.
    Connected Bluetooth display (DL-Link) and display in
    Display. - SD Memory Card - title selectable and controllable. Display on the display.
    Volume control for the audio output louder / quieter (<< / >>) and display. - Applicators for cortex and / or mastoid can be switched on / off individually and displayed. - Menu navigation and apps on the display. - Time monitoring and automatic deactivation of the display (the backlight) and / or the controller 11. - BUSY display on the display to indicate the "READY" state on the device. - Storage of data in the EEPROM such. Operating hours counter, number of treatments started. - USB socket to make program changes and charge the battery.
    The processing of the patient data can be done via an upload. The data can then be processed by PC and separate software.
    In one embodiment, the coils consist of an iron core. The size of the iron core is a length of 30 mm to 60 mm, in particular 50 mm to 60 mm and a diameter of 6 mm. The coil consists of 600 to 650 windings made of a copper wire with a diameter of 0.2 mm.
    In the embodiment according to FIG. 3, in turn, a plurality of coils are integrated in a headphone 21 or, in particular, the headphone clutches 29, wherein it can be seen that in the embodiment shown in FIG. 3, both the coils 22a for the mastoid and the coils 22b for the cortex are respectively integrated at different height positions in the headphone clutches 29. Similar to the embodiment according to FIG. 1, additional elements, such as a controller 24, a display 25, an input device 26, loudspeakers 27 and regions or heat pads 28 to be heated are likewise integrated into the headphone shell 29 and indicated schematically.
    In Fig. 4 is a schematic and enlarged, not to scale representation, a coil 30 partially shown in section, wherein it can be seen that a designated 31 first winding layer is wound helically, as indicated by the dashed line 31 'of the wires of this layer 31st is indicated.
    Subsequently, a layer 32 is indicated, the wires are wound orthocyclically, as shown by the schematically indicated course 32 ', which are substantially normal to the coil axis relative to the oblique or inclined arrangement of the helical winding 31 and 31'.
    The arrangement of layers 31, 32 with different winding can be achieved fields with steep harmonic containing pulses in contrast to coils with uniform or uniform winding in particular, with such cases, in particular in a push-pull operation of each ear associated coils 2a and 2b and 22a and 22b.
    According to the field strength to be achieved, the coil 30, which is only schematically indicated in FIG. 4, can be used for both the cortex coils 2b and 22b and the mastoid coils 2a and 22a, with a correspondingly large number of windings and winding layers provided, which at least partially contain different windings.
    List of Reference Numerals 1, 21 Bracket 2a, 22a Coil Mastoid 2b, 22b Coil Cortex 3 Power source 4, 24 Control 5, 25 Display device (display, HD Retina display) 6, 26 Input device (touch screen, speech recognition) 7, 27 Loudspeaker 8, 28 Warm area or Thermal Pad 9a Serial Data Interface (RS232) 9b Audio Interface 9c Data Interface (Bluetooth) 10 Memory Module 11 Controller 12 Memory (EEPROM) 13 RTC (Real Time Clock) 14 Reset 15 Clock 16 D / A Converter 17 Output Amplifier 18 Voltage conditioning 19, 29 headphone shell 30 coil 31, 31 'helical winding 32, 32' orthocyclic winding
    权利要求:
    Claims (17)
    [1]
    claims
    1. A device for generating alternating magnetic fields for inducing eddy currents in an organism for the treatment of tinnitus in particular, comprising - a head part (1, 21), - a power source (3), - a controller (4, 24), - one or a plurality of coils (2a, 2b, 22a, 22b), characterized in that the at least one coil (2a, 2b, 22a, 22b, 30) has at least two layers (31, 32) with under different winding.
    [2]
    2. Apparatus according to claim 1, characterized in that the at least one coil (2a, 2b, 22a, 22b, 30) at least one layer with orthocyclic winding (32, 32 ") and at least one layer with helical winding (31, 31" ) having.
    [3]
    3. A device according to claim 2, characterized in that the at least one coil (2a, 2b, 22a, 22b, 30) has a plurality of adjacent layers each having orthocyclic and helical winding (32, 32 ', 31, 31').
    [4]
    4. Apparatus according to claim 1, 2 or 3, characterized in that the at least one coil (2a, 2b, 22a, 22b, 30) in or on a headphone (1, 21), in particular in or on a headphone shell ( 19, 29) is arranged.
    [5]
    5. Device according to one of claims 1 to 4, characterized in that each ear is associated with two coils (2a, 2b, 22a, 22b) at different height positions.
    [6]
    6. The device according to claim 5, characterized in that the each ear associated coils (2a, 2b, 22a, 22b) are operated in push-pull.
    [7]
    7. Device according to one of the preceding claims, characterized in that the device comprises an astable multivibrator comprising at least one transistor and at least one bipolar iron core coil for delivering the alternating fields.
    [8]
    8. Device according to one of the preceding claims, characterized in that the frequency is selected below 20 Hz, in particular between 3 and 15 Hz.
    [9]
    9. Device according to one of the preceding claims, characterized in that a particular digital wobble of the frequency by ± 50%, preferably ± 25%, preferably ± 10%, is provided.
    [10]
    10. Device according to one of the preceding claims, characterized in that as a power supply (3), a low-voltage DC voltage source, in particular a 9-volt DC voltage source, is provided.
    [11]
    11. Device according to one of the preceding claims, characterized in that the device has at least one display (5, 25), in particular an LCD display.
    [12]
    12. Device according to one of the preceding claims, characterized in that the device additionally comprises an input device (6, 26) and a display device (5, 25).
    [13]
    13. Device according to one of the preceding claims, characterized in that the device additionally comprises speakers (7, 27) for the sound output.
    [14]
    14. Device according to one of the preceding claims, characterized in that the device comprises one or more warm area (s) (8, 28).
    [15]
    15. Device according to one of the preceding claims, characterized in that the device comprises a data interface (9a, 9b).
    [16]
    16. Device according to one of the preceding claims, characterized in that the device comprises a memory module (10).
    [17]
    17. Use of the device according to one of the preceding claims for the treatment of ear noises, sleep disorders, headaches, migraine, cervical and vertebral syndromes, nervousness and circulatory disorders.
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    同族专利:
    公开号 | 公开日
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT8202015|2015-12-23|JP2018552095A| JP6982576B2|2015-12-23|2016-12-07|A device that generates an alternating magnetic field to induce eddy currents in a living body|
    EP16829058.3A| EP3393578A1|2015-12-23|2016-12-07|Device for generating alternating magnetic fields for inducing eddy currents in an organism|
    US16/064,576| US10912946B2|2015-12-23|2016-12-07|Device for generating alternating magnetic fields for inducing eddy currents in an organism|
    CA3008178A| CA3008178A1|2015-12-23|2016-12-07|Device for generating alternating magnetic fields for inducing eddy currents in an organism|
    PCT/AT2016/000098| WO2017106884A1|2015-12-23|2016-12-07|Device for generating alternating magnetic fields for inducing eddy currents in an organism|
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