Magnetic Therapeutic Appliance and Method for Operating Same
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Abstract
The invention relates to a therapeutic appliance for treating a patient with an electric field or a magnetic field. In known therapeutic appliances, resistance losses in the coils needed for the magnetic field lead to undesired warming of the therapeutic appliance. According to the invention, the energy of the coil (17) is carried off via a load resistor that can be arranged on the side away from an active area of the therapeutic appliance. Alternatively, or in addition to this, the energy of the coil (59) can be carried off via a return to the mains. Moreover, the invention proposes generating a magnetic field of variable magnitude with an oscillating circuit (59) which is cyclically, periodically or intermittently excited before oscillations can completely dissipate. Finally, the invention proposes the use of a magnetic core made of an iron powder.
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Citations
58 Claims
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1-41. -41. (canceled)
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42. A therapeutic appliance, having an electrical power supply, an electrical resonant circuit with a coil, and a working area,
with the electrical power supply being connected to at least one component in the resonant circuit, wherein energy can be transferred via the connections to the at least one component in the resonant circuit, and a variable magnetic field which is produced in the coil passes through the working area, a) wherein a control device is provided, by which at least one switching element can be operated via signal connections, with the resonant circuit being closed in a first phase on operation of the at least one switching element, with the resonant circuit being opened in a second phase on operation of the at least one switching element and an energy supply being enabled between the electrical power supply and the at least one component in the resonant circuit, and b) wherein a means for determining a time to end the first phase being provided in the control device, from which the transient oscillations in the resonant circuit have not decayed below a predetermined extent.
Specification