Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1992-06-22
1995-03-07
Green, Randall L.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
607 9, 607 14, 607 17, 607 28, A61N 136, A61N 1368, A61N 1362
Patent
active
053953932
ABSTRACT:
An implantable cardioverter/defibrillator device having an improved sensing system for automatically and rapidly adjusting to changing amplitudes of intracardiac electrogram "ICEG" signals during transitions between normal sinus rhythm and ventricular tachycardia/ventricular fibrillation of a patient's heart is disclosed. ICEG signals are sensed, amplified and filtered to remove high frequency and low frequency noise and artifacts therefrom. Crossings of positive and negative threshold levels by the filtered signals are detected and corresponding positive and negative output signals representative thereof are provided. The positive and negative threshold levels are varied in accordance with corresponding variations of fractions of the levels of the filtered signals so that the positive and negative threshold levels move independently of one another in response to changes in the levels of the filtered signals; and, the positive and negative output signals generated during each heart beat are rationalized so that only one output signal is provided per heart beat.
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Brittingham Debra S.
Green Randall L.
Telectronics Pacing Systems Inc.
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