Patent ID: 9326697
Filing Date: 2016-05-03
CPC Classification: A61B,A61N

Claim Text:
1. A method for calculating an arrival time for a QRS complex, comprising: obtaining with a wearable or an implantable arrhythmia monitoring and detection device a time sequence comprising equally spaced amplitude signals representing the electrical activity of a heart; selecting a time window defined to include a fixed number of the equally spaced amplitude signals such that the time window has a window width; obtaining from the time sequence a first segment comprising the fixed number of equally spaced amplitude signals, and calculating for the first segment the sum of the absolute value of the differences between each adjacent pair of amplitude signals in the first segment; obtaining from the time sequence subsequent overlapping segments of amplitude signals, and calculating for the subsequent overlapping segments the sum of the absolute value of the differences between each adjacent pair of amplitude signals in the segment, wherein the step of obtaining subsequent overlapping segments continues until the sum exceeds a predetermined threshold value; when the sum exceeds the predetermined threshold value, setting a flag and recording the corresponding calculated sum in a maximum sum parameter; obtaining from the time sequence subsequent overlapping segments, and calculating for the subsequent overlapping segments the sum of the absolute value of the differences between each pair of amplitude signals in the time window, and if the calculated sum is greater than the maximum sum parameter, resetting the maximum sum parameter to the calculated sum and recording an identifier parameter that identities the segment, wherein the step of obtaining segments continues until the number of subsequent overlapping segments that have been obtained without resetting the maximum sum parameter exceeds a predetermined number; and calculating the arrival time of the QRS complex as the center of the time window corresponding to the segment identified by the identifier parameter.