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:
May. 30, 1978
Filed:
Aug. 03, 1976
Robert R Brownlee, State College, PA (US);
G Frank Tyers, Hershey, PA (US);
Research Corporation, New York, NY (US);
Abstract
A cardiac pacing apparatus of the type having a first signal processing channel which functions in the demand mode is disclosed including a second signal processing channel for detecting electromagnetic interference and causing the pacing apparatus to revert to a safe operating rate in the presence of such interference. In a preferred embodiment, the second signal processing channel has an enhanced high-frequency response with respect to that of the first signal processing channel in order to optimize interference detection. The second channel may receive an input from either a conventional cardiac sensing and pacing electrode, or else a second electrode, remote from the heart, may be provided for interference detection. When electromagnetic interference is detected by the second signal processing channel, an override of the conventional demand pacer inhibit function occurs and the pacing apparatus is switched to a safe operating rate, which may be either an appropriate predetermined fixed rate or a rate-limited rate synchronous with the detected electromagnetic interference. In an alternate embodiment, the gain of the second signal processing channel is reduced with respect to that of the first channel, and the pacing apparatus is switched to a safe operating rate upon the detection of electromagnetic interference having an amplitude level above that of natural cardiac signals.