[Design of an digital electrical impedance plethysmograph].
The design of an digital impedance plethysmograph capable of measuring tissue impedance and volume change of the ateries during endsystole is reported, The 50KHz frequency impedance signal is sampled at its peaks and the envelope is used to follow the volume change without phase sensitive demodulator. It makes frequency and amplitude of the signal more stable and an improved signal to noise ratio.
D001330:Electronic Data Processing; D004867:Equipment Design; D010992:Plethysmography, Impedance / Q000295:instrumentation*