Patent ID: 8483814

Claim:
A device for monitoring and displaying cardiac function of a patient comprising: a.) at least one accelerometer sensor having multi-axis output, placed on the patient's body to collect vector accelerometer data along two axis selected from the set of xyphoid to apex of the heart axis, and xyphoid to carotid artery axis; said sensor generating signals in response to compression waves originating the heart along at least the two axes; b.) a signal processing system comprising multiple seisomocardiographic SCG channels coupled to said sensor for generating a SCG waveform along each axis, forming a carotid SCG channel waveform along one axis, and a xyphoid channel waveform along one axis, and a apex SCG channel waveform along one axis, and for recording and storing a segment of said SCG waveforms for analysis; c.) a module for extracting the time of mechanical events in the heart from said SCG waveform segment and for presenting the time of each such events to a system user on a display; d.) wherein said set of mechanical events is selected from the group comprising; mitral valve closing event MC, mitral valve opening event MO, aortic valve closing event AC, atrial valve opening AO; said device further comprising; e.) a set of electrocardiographic ECG electrodes placed on said patient's body for generating signals in response to electrical depolarization of originating the heart; f.) signal processing system coupled to said ECG electrodes for generating an ECG waveform, and for recording and storing a segment of said ECG waveform for analysis; g.) said atrial valve opening event AO module for carrying out a selection process in one SCG channel includes; forming an average carotid acceleration wavelet from said carotid SCG channel waveform; identify the R wave peak in the ECG channel; identify the largest positive peak in said SCG channel waveform within 220 msec of the R peak and mark this point as AO carotid, if no positive peak is found, start search again at R wave peak and search ahead for the largest negative peak, when found, search back for the first negative knee (concave down), and mark this point as AO carotid.