Patent ID: 6681131
Filing Date: 2004-01-20
Classification: A61B

Abstract:
An apparatus for measuring bio-magnetic fields for creating a contour map and an arrow map comprising: a plurality of magnetometers for detecting magnetic fields generated from a live body; a driving circuit for driving said magnetometers; a computer for collecting output signals of said driving circuit in the form of data representing at least one waveform of magnetic fields generated from the live body and for performing an arithmetic processing on said data representing the waveform of magnetic fields; a display unit; a first and a second signal processing circuits for processing output signals of said driving circuit; a signal generator for generating high-frequency AC current adapted to be applied to the live body; and an electric wire for transmitting said high-frequency AC current from said signal generator to the live body via a plurality of electrodes adapted to be attached to a plurality of points on the live body; wherein said first signal processing circuit has a first band-pass filter for passing a first predetermined bandwidth portion of the output signals of said driving circuit, a filter for removing at least one predetermined frequency portion from output signals of said first band-pass filter, and a first amplifier for amplifying output signals of said filter, said second signal processing circuit has a high-pass filter for passing a high bandwidth of the output signals of said driving circuit, a phase-shift detector for demodulating a portion with a frequency of said signal generator from output signals of said high-pass filter, a second band-pass filter for passing a second predetermined bandwidth portion of output signals of said phase-shift detector, and a second amplifier for amplifying output signals of said second band-pass filter, and said display unit displaying at least one of the output signal of said first signal processing circuit and the output signal of said second signal processing circuit.