发明名称 |
THRESHOLD TEMPLATING FOR DIGITAL AGC |
摘要 |
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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申请公布号 |
CA2228578(A1) |
申请公布日期 |
1997.02.27 |
申请号 |
CA19962228578 |
申请日期 |
1996.08.14 |
申请人 |
CARDIAC PACEMAKERS, INC. |
发明人 |
HAEFNER, PAUL A.;STOCKBURGER, MARK A. |
分类号 |
A61N1/37;(IPC1-7):A61N1/37 |
主分类号 |
A61N1/37 |
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