Patent ID: 9272146
Filing Date: 2016-03-01
CPC Classification: A61B,A61N

Claim Text:
1. A device, comprising: a lead having at least one electrode; an acceleration sensor adapted to output an endocardial acceleration signal; circuitry configured to receive and process said endocardial acceleration signal and to provide ventricular pacing using the lead by varying, in a controlled manner, an atrioventricular delay (“AVD”) in a range having a plurality of AVD values, wherein the circuitry derives from said endocardial acceleration signal a value of a parameter representative of a component of the endocardial acceleration signal corresponding to the first endocardial acceleration peak associated with an isovolumetric ventricular contraction (“EAX component”), and evaluates a degree of variation of said parameter values as a function of said plurality of AVD values to detect atrial and ventricular event; wherein the circuitry is configured to evaluate said degree of variation of said parameter values as a function of said plurality of AVD values by calculating a difference between the values of the parameter collected for a first range of AVD values and the values of the parameter collected for a second range of AVD values, and wherein said first range of AVD values includes a plurality of short AVD values and said second range of AVD values, distinct from said first range of AVD values, includes a plurality of long AVD values; and wherein the circuitry is further configured to discriminate between a normal atrial mechanical activity, when said difference exceeds a predetermined threshold, and an absent or deficient atrial mechanical activity when said difference does not exceed said predetermined threshold.