Patent ID: 8849425

Claim:
An implantable apparatus configured to detect external noise comprising: a device body comprising a signal analysis element coupled with a device body electrode; a memory coupled with said signal analysis element; a flexible lead body comprising a proximal end; a distal end; at least one electrode situated proximally to said distal end of said flexible lead body wherein said at least one electrode is coupled with said signal analysis element; at least one accelerometer coupled with said signal analysis element; wherein each of said at least one accelerometer comprises device frame coordinates; said signal analysis element comprising at least one detection element configured to detect peak markers or signal features from said at least one electrode that is implanted in a body of a patient and at least one motion characteristic from said at least one accelerometer that is also implanted in said body of said patient; wherein said signal analysis element is configured to: determine if a potential arrhythmia condition exists based on said peak markers or said signal features; and obtain a heart rate from said peak markers or said signal features; and obtain said at least one motion characteristic from said at least one detection element; and determine if said peak markers or said signal features from said at least one electrode occur in a time window that includes said at least one motion characteristic over at least one threshold for frequency or amplitude or frequency and amplitude or within range of a pattern if said heart rate is above a fast threshold and if so, mark said potential arrhythmia as incorrect, or otherwise mark said potential arrhythmia as confirmed or determine if said at least one motion characteristic is under a duration threshold if said heart rate is below a slow threshold and if so, mark said potential arrhythmia as confirmed, or otherwise mark said potential arrhythmia as incorrect; and obtain a first sample orientation associated with a first body position of said patient and obtain at least a second sample orientation associated with a second body position of said patient; and calculate patient body frame coordinates of said body of said patient from said first sample orientation and said second sample orientation; and calibrate said at least one accelerometer to said device frame coordinates of each of said at least one accelerometer and said patient body frame coordinates; and, calculate a rotation matrix between said device frame coordinates of each of said at least one accelerometer and said patient body frame coordinates to calibrate said at least one accelerometer.