Apparatus for monitoring cardiac activity via ECG and heart sound signals
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United States of America Patent
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-
Oct 22, 1985
Issued Date -
N/A
app pub date -
Feb 23, 1984
filing date -
Mar 6, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
From a heart sound signal input the occurrence of a first occurring heart sound is detected. Thereupon a predetermined heart sound enable window time is established, which for a first detection cycle is set to approximately the diastolic interval for the maximum heart rate to be detected. If a second heart sound occurs within this heart sound enable window time, this second heart sound is detected as a systole heart sound. The first heart sound may be detected as a diastole heart sound. If a second heart sound does not occur within the heart sound enable window time the procedure is repeated with increasing heart sound enable time as long as a second heart sound occurs within an increased heart sound enable window time. For monitoring remotely or by a using recording, an ECG signal is modulated and combined with the associated heart sound signal for use as a single combined signal.
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