The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 19, 1989
Filed:
May. 13, 1987
Malcolm P Cole, Jr, Houston, TX (US);
The Methodist Hospital System, Houston, TX (US);
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.