Patent ID: 8634915
Filing Date: 2014-01-21
Classification: A61B,A61N

Abstract:
1. An implantable medical device, comprising: a pulse generator configured to deliver cardiac pacing to a heart; an accelerometer configured to generate a signal modulated by acceleration that is available at an accelerometer output terminal; a first filter channel coupled to the accelerometer output terminal, the first filter channel configured to attenuate first frequencies of the accelerometer signal to produce a first filtered output indicative of a level of patient activity; a second filter channel coupled to the accelerometer output, separate from the first filter channel, the second filter channel configured to attenuate second frequencies of the accelerometer signal to produce a second filtered output indicative of phrenic nerve activation; and circuitry coupled to the first filter channel and the second filter channel and configured to evaluate a level of patient activity using the first filtered output and to detect phrenic nerve activation caused by cardiac pacing using the second filtered output.