Ryan, Maki, Mann & Hohenfeldt
Systems and methods for adaptive filtering artifacts from composite signals
 Analog or digital systems or methods filter an artifact from a signal derived from a biological event comprising sample values arranged with respect to time. The systems and methods generate a variable expressing a template of the artifact and reduce the derived biological signal by the variable to derive a filtered derived biological signal. The systems and methods change the variable over time based upon the energy of the filtered derived biological signal to minimize the energy of the artifact remaining in the filtered derived biological signal over time. The systems and methods output the filtered derived biological signal. The systems and methods remove artifacts from signals derived from a biological event; for example, electrograms, electrocardiograms, electroencephalograms, electrogastrograms, electromyograms, and respiratory signals. 
EP Technologies, Inc.
A Y A H A A
A61B Y10S A61B H03H A61B A61N
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James G. Dorin
Whayne Panescu