DEVICE FOR AUTOMATIC TUNING CIRCUIT OF PATIENT AT UHF-THERARY Russian patent published in 1994 - IPC

FIELD: medical engineering. SUBSTANCE: device has mismatching detector, provided with d. c. amplifier on its secondary output. Outputs of the amplifier are connected to magnetizing winding, disposed onto the core - rod, made of soft magnetic material. Output circuit has two air output inductance coils. The circuit is provided with additional parallel oscillating circuit, connected to start points of output coils. Ends of the coils have to be outputs of the device for connecting load. One branch of additional parallel oscillating circuit has permanent capacitance capacitor connected in series with reactive resistance. The other branch of the circuit has the third inductance coil, disposed onto magnetic core, which is mechanically connected with the core of magnetizing winding, to form closed magnetic circuit for permanent magnetic field. There is a communication coil between output coils, disposed in alignment. The communication coil is mounted for movement in perpendicular to the axis of output coils. The communication coil is connected to primary output of mismatching transducer, made in form of phase detector. EFFECT: improved safety of procedure; optimal control performance when tuning device for specific UHF apparatus. 2 cl, 2 dwg