Pulse oximetry system
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United States of America Patent
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-
Feb 28, 1989
Grant Date -
N/A
app pub date -
Oct 9, 1987
filing date -
Oct 9, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A pulse oximetry system is provided in which LEDs of two different wavelengths illuminate tissue containing arterial blood flow. A photodiode receives light from the LEDs and produces electrical signals containing pulsatile components. The components of the two wavelengths are separated and the pulsatile waveforms are monitored until signal peaks are detected at the end of diastole. The waveforms are then integrated over the systolic interval, and the integrals are combined with the signal peak values to determine an index value. The index value is used to select a value representative of oxygen saturation from a look-up table.
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