Evaluation method and apparatus for determining the time stationarity of measured physiological signals

US6731972B2 · kind B2 · utility

Assignee

• Biotronik Mess -und Therapiegeraede GmbH & Co. Ingenieurbuero Berlin · DE

Inventors

• Wolfgang Meyer · Erlangen, DE
• Max Schaldach · Erlangen, DE

Key dates

• Filing date: Jul 26, 2001
• Grant date: May 4, 2004
• Expiry date: Mar 2, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S128/92
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An evaluation method that includes:recording the values of a physiological signal during a certain measuring period;dividing the obtained time series of signal values into individual segments;mapping successive subsets of the individual signal values in a segment on associated symbol series according to the criterion of whether a respective signal value increases or decreases as compared to the preceding signal value;determining the frequencies of the varying symbol series;determining a testing parameter which reflects the frequency ratio, within a segment, of correlated symbol series to anti-correlated symbol series;determining the relative difference of the testing parameters of two adjacent segments; andcomparing the relative difference of two testing parameters with a given threshold as a criterion for the stationarity of the time series of the recorded physiological signal.