Pulse Oximeter using a virtual trigger for heart rate synchronization
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United States of America Patent
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Apr 28, 1998
Issued Date -
N/A
app pub date -
Oct 5, 1995
filing date -
Oct 8, 1993
priority date (Note) -
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Abstract
The present invention provides an improved method and apparatus for more accurately calculating and measuring vital information such as oxygen saturation and pulse rate when an ECG signal is not available. Instead of using an ECG R-wave as a trigger to overlay optical pulses, a virtual trigger is generated based on the heart rate and used to overlay optical pulse data. The optical information from a number of periods is added together, with the beginning of each period being determined by the issuance of the virtual trigger. In this way, the maximum and minimum of the optical signal should be lined up with each other in each period and added together to give a cumulative maximum and minimum. This enables precise identification of the maximum and minimum of the signal, and thus allows calculation of the oxygen saturation at that point.
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