Patent ID: 9655533
Date: 2017-05-23
CPC Classifications: A61B

Claim:
1. A method comprising: (I) measuring a plethysmograph waveform using a sensor coupled to a peripheral artery of a subject, indicative of a plurality of cardiac cycles, wherein the plethysmograph waveform includes a systolic waveform and a diastolic waveform, corresponding to each cardiac cycle; (II) estimating a first start time and a first duration for the systolic waveform of a first cardiac cycle, based on at least one cardiac cycle from the plurality of cardiac cycles; (III) computing a plurality of amplitudes at a plurality of time instants for the first duration of the systolic waveform of the first cardiac cycle, wherein the sensor is powered only during the first duration to reduce consumption of power by the sensor; (IV) determining a second start time and a second duration of the systolic waveform of a second cardiac cycle from the plurality of cardiac cycles based on the plurality of amplitudes; wherein the second cardiac cycle is acquired after the first cardiac cycle in time sequence; (V) assigning the second cardiac cycle, the second start time, and the second duration to the first cardiac cycle, the first start time, and the first duration respectively; and iteratively performing (III), (IV), (V) for the plurality of cardiac cycles acquired sequentially in time to generate sampled plethysmograph data.