Apparatus and method for filtering electrocardiograph signals

Details Apparatus and method for filtering electrocardiograph signals Apparatus and method for filtering electrocardiograph signals

1987-05-13

1989-12-19

Jaworski, Francis

Surgery

Truss

Pad

128901, 128653, 128709, A61B 504

Patent

active

048876097

ABSTRACT:
Apparatus and method for filtering the electrocardiograph (ECG) signal of a patient of unwanted signals, such as contamination signals produced by the use of nuclear magnetic resonance imaging system or muscle artifact signals. In a preferred embodiment, variable filter (2) is used to filter an input ECG signal (1). The filtering characteristics applied to the ECG signal by variable filter (2) vary in response to the logical state of a synchronization signal indicating a patient's biophysical state which is input to variable filter (2) via line (3). In alternative embodiments, a QRS detector (22), a delay circuit (20), and a pulse stretcher (21) may be used to provide a synchronization signal. In another alternative embodiment, a microprocessor (24) with an input ECG signal and with input data is used to control the filtering of the ECG signal in synchronization with a patient's ECG signal.

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