06393316 is referenced by 319 patents.

A device for monitoring heart rhythms. The device is provided with an amplifier for receiving electrogram signals, a memory for storing digitized electrogram segments including signals indicative of depolarizations of a chamber or chamber of a patient's heart and a microprocessor and associated software for transforming analyzing the digitized signals. The digitized signals are analyzed by first transforming the signals into signal wavelet coefficients using a wavelet transform. The higher amplitude ones of the signal wavelet coefficients are identified and the higher amplitude ones of the signal wavelet coefficients are compared with a corresponding set of template wavelet coefficients derived from signals indicative of a heart depolarization of known type. The digitized signals may be transformed using a Haar wavelet transform to obtain the signal wavelet coefficients, and the transformed signals may be filtered by deleting lower amplitude ones of the signal wavelet coefficients. The transformed signals may be compared by ordering the signal and template wavelet coefficients by absolute amplitude and comparing the orders of the signal and template wavelet coefficients. Alternatively, the transformed signals may be compared by calculating distances between the signal and wavelet coefficients. In preferred embodiments the Haar transform may be a simplified transform which also emphasizes the signal contribution of the wider wavelet coefficients.

Title
Method and apparatus for detection and treatment of cardiac arrhythmias
Application Number
9/566477
Publication Number
6393316 (B1)
Application Date
May 8, 2000
Publication Date
May 21, 2002
Inventor
Lev A Koyrakh
Plymouth
MN, US
Jeffrey J Gillberg
Coon Rapids
MN, US
Agent
Girma Wolde Michael
US
Assignee
Medtronic
MN, US
IPC
A61N 5/04
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