Patent ID: 7574260
Filing Date: 2009-08-11
Classification: A61B,A61N

Abstract:
1. A method of operating an implantable medical device, comprising: defining at least one detection window; sensing a cardiac signal; detecting a feature of the sensed cardiac signal, the detected feature being disposed at a location relative to the detection window; comparing the detected feature to the detection window; determining a direction of change for the detection window based on comparison of the detected feature to the detection window; and modifying the detection window to provide a modified detection window for use with a subsequent cardiac signal, comprising: modifying the detection window using a first adjustment coefficient associated with a preferred direction in response to the direction of change corresponding to the preferred direction; and modifying the detection window using a second adjustment coefficient associated with a second direction in response to the direction of change corresponding to the second direction, wherein modifying the detection window using the first adjustment coefficient modifies the detection window more aggressively than modifying the detection window using the second coefficient.