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A Novel Sphygmogram Sampling and Self-Adjusting Scheme for e-Home Healthcare

Pulse wave transmit time method has been used to estimate blood pressure by simultaneously measuring electrocardiogram & pulse signals (1) . Most researchers use photo reflective sensor to capture photoplethysmograph (PPG) signal by attaching sensor on finger tip. However, such a way would interfere hands in operating further the e-home healthcare system, plus PPG has flatter morphological shape (2) which is not adequate for searching feature points. Thus the piezoelectric ceramics is selected to acquire sphygmogram (SPG) signal with sharp morphological shape from wrist. Using such a way can free fingers to operate the e-home healthcare system. A SPG sampling scheme with signal conditioning circuit and relevant software for realizing signal amplitude and baseline-shift self-adjustment are proposed in this paper. A close-loop control is constructed between computer and micro control unit (MCU) such that to acquire the self-adjusted stable SPG signal. The testing results show out superior features of this scheme .