DETECTOR DEVICE FOR DISCOVERING FOREIGN BODIES Russian patent published in 2004 - IPC

FIELD: medical engineering.

SUBSTANCE: device has AC generator having excitation coil connected to its output. The excitation coil is connected to resistor one end of which is grounded. Two receiving coils are arranged coaxially with the excitation coil on both its sides and gradientometrically coupled. Their first ends are grounded and the second ends are connected to the first amplifier input, the output of which is connected to synchronous detector input connected to the second amplifier output via the first key. Its output is connected to arrow indicator. The receiving coils are designed as ferric probe transducers. The first output of an additional AC generator is connected to the second ends of the receiving coils and the second one is connected to synchronizing input of synchronous detector. Input of additional synchronous detector is connected to output of the first amplifier. Frequency multiplier output is connected to the synchronizing input of synchronous detector. The first input of frequency multiplier is connected to excitation coil resistor, its second input being connected to additional AC generator input. Additional synchronous detector output is connected to the second input via the second key.

EFFECT: high sensitivity of device; high accuracy in determining foreign body position.

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