Method and apparatus for determining an EMG signal
AssigneeMaquet Critical Care AB
InventorsUrban Blomberg, Fredrik Jalde
Life of this patent
Estimating the term…
Abstract
A method and apparatus for filtering an electromyogram (EMG) signal from a raw signal which includes a contribution from an electrocardiogram (EKG) signal is disclosed. The method includes the steps of estimating an attribute (such as a Fourier transform) of both the EMG contribution to the raw signal and the EKG contribution to the raw signal and, dependent on both frequency spectrums, determining an EMG window in a frequency range and obtaining the EMG signal by passing it through a filter defined by the frequency range. The method is particularly used when monitoring a multi-channel electrical recording from a plurality of electrodes attached to a patient's diaphragm.
Claims14
A method for determining an electromyogram (EMG) signal out of a raw signal comprising the steps of:
- obtaining a plurality of signals from a subject via a plurality of electrodes configured to interact with the subject to detect signals from the diaphragm of the subject, each electrode having a signal channel associated therewith;
- combining the respective signals of the signal channels to form a multi-channel raw signal that contains an electrocardiogram (EKG) contribution arising from an EKG signal of the subject and an EMG contribution arising from an EMG signal of the subject;
- automatically electronically estimating an attribute of said contribution of said EKG signal of the subject to said raw signal and an attribute of said contribution of said EMG signal of the subject to said raw signal, to obtain an estimated EKG signal attribute and an estimated EMG signal attribute;
- and
- dependent on the frequency spectrum of said estimated EKG signal attribute and the frequency spectrum of said estimated EMG signal attribute, automatically electronically determining an EMG window in a frequency range and frequency-domain filtering said raw signal only within said frequency range of said window to obtain said EMG signal as a filtered-out signal.
Dependencies are inferred from the claim text.