System and method for dynamic focusing to the heart and/or lungs by frequency adjustment and analysis of impedance phase and/or amplitude variations

摘要

The vital signs monitoring device 10 includes a radio frequency RF loop coil 12 that resonates at both low frequencies and high frequencies that are different from the low frequencies. The annular Faraday shield 18 is arranged to shield the RF loop coil. Oscillator circuit 22 is connected to both the lower and higher oscillation frequency determining RF loops. The read-out electronics 24 measures the electrical response of the RF loop coil excited by the voltage source at both low and high frequencies and extracts at least one signal component of the electrical response at said low frequency, Extracting at least one signal component of the electrical response at the frequency and using both the at least one signal component of the electrical response at the low frequency and the at least one signal component of the electrical response at the high frequency. Connected to generate vital sign data.