	US 7,333,855 B2
	Method and apparatus for determining oversensing in a medical device
Bruce D. Gunderson, Plymouth, Minn. (US); Jian Cao, Shoreview, Minn. (US); and Troy E. Jackson, New Brighton, Minn. (US)
Assigned to Medtronic, Inc., Minneapolis, Minn. (US)
Filed on Apr. 15, 2005, as Appl. No. 11/107,706.
Claims priority of provisional application 60/632000, filed on Dec. 01, 2004.
Prior Publication US 2006/0116732 A1, Jun. 01, 2006
Int. Cl. A61N 1/08 (2006.01)

U.S. Cl. 607—27

22 Claims

1. A method of controlling delivery of therapy in a medical device, comprising:

sensing cardiac signals and detecting cardiac events via a first electrode configuration;

determining the presence of an episode event in response to the detected cardiac events;

sensing the cardiac signals via a second electrode configuration;

determining predetermined values associated with cardiac signals sensed via the second electrode configuration corresponding to the event episode; and

controlling delivery of therapy in response to the determined values, wherein determining predetermined values comprises:

determining voltage values of a predetermined number of samples located within a window defined about the cardiac signals sensed via the second electrode configuration;

determining a sample maximum voltage value and a sample minimum voltage value corresponding to the predetermined number of samples; and

comparing the sample maximum voltage value and the sample minimum voltage value to generate sample amplitudes.