Surgery: light – thermal – and electrical application – Light – thermal – and electrical application – Electrical therapeutic systems
Patent
1995-08-14
1997-08-19
Kamm, William E.
Surgery: light, thermal, and electrical application
Light, thermal, and electrical application
Electrical therapeutic systems
128708, 128901, A61N 139
Patent
active
056583176
ABSTRACT:
A system and method automatically adjusts a sensing threshold in a cardioverter/defibrillator which receives electrical activity of the heart and delivers shock pulses in response thereto. An amplifier amplifies the electrical activity. A detection circuit detects depolarizations in the amplified electrical activity and provides a detect signal representing a cardiac event indicative of a depolarization when the amplified electrical activity exceeds a variable sensing threshold. Digital template generation circuitry responds quickly to track amplitudes of the electrical activity and to set the variable sensing threshold to a level proportional to a peak value of the amplitude of the amplified electrical activity and then decreases the variable sensing threshold from the level in discrete steps until the variable sensing threshold is at a low threshold value. The discrete steps are grouped into step groups. Each step group decreases the variable sensing threshold by a defined percentage.
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Abstract from Derwent Publications for SU 1466 707 Jul. 14, 1987.
Haefner Paul A.
Stockburger Mark A.
Cardiac Pacemakers Inc.
Jastrzab Jeffrey R.
Kamm William E.
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