Pulse oximetry system

Details Pulse oximetry system Pulse oximetry system

1987-10-09

1989-02-28

King, Lloyd L.

Surgery

Truss

Pad

128666, 356 41, A61B 500

Patent

active

048076317

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.

REFERENCES:
patent: 3647299 (1972-03-01), Lavallee
patent: 4266554 (1981-05-01), Hamaquri
patent: 4407290 (1983-10-01), Wilber
patent: 4653498 (1987-03-01), New, Jr. et al.
patent: 4694833 (1987-09-01), Hamaquri
patent: 4714080 (1987-12-01), Edgar, Jr. et al.

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