Patent ID: 8965491
Filing Date: 2015-02-24
Classification: A61B,A61N

Abstract:
1. An implantable device (ID) comprising operational circuitry and a plurality of electrodes electrically coupled to the operational circuitry to allow observation of electrical activity by the operational circuitry when the ID is implanted in a patient, wherein the operational circuitry is configured to perform a method of detecting cardiac signals, comprising: sensing electrical activity using the electrodes; detecting a detected event in the electrical activity; analyzing the detected event by defining an analysis window having an analysis window duration, identifying characteristic features of the electrical activity sensed during the analysis window, and counting the characteristic features that occur during the analysis window to generate a characteristic feature count for the detected event; and comparing the characteristic feature count to a predefined threshold and either rejecting the detected event as suspect or accepting the detected event as likely being of cardiac origin; wherein the operational circuitry is configured to modify the analysis window duration and the predefined threshold to maintain a desired relationship therebetween.