Condensed oximeter system with noise reduction software

Details Condensed oximeter system with noise reduction software Condensed oximeter system with noise reduction software

1991-08-05

1994-10-04

Sykes, Angela D.

Surgery

Truss

Pad

128664, 128665, 128666, 356 41, A61B 500

Patent

active

053516850

ABSTRACT:
A compact pulse oximetry system which separates the combined signal into its respective AC and DC components. By separating the signal into AC and DC components, a smaller order bit A/D converter may be used while still maintaining signal accuracy. Instead of using the combined signal to calculate the oxygen saturation content, the system microprocessor computes the Ratio of Ratios using the derivative of the separated AC component of the diffused signal to calculate the oxygen saturation of the measured fluid. To calculate the Ratio of Ratios, a ratio of the derivative value of the separated AC component is used. Instead of taking a single sample between the peak and valley of the signal, the oximeter system samples each value. To decrease the effect of system noise, a linear regression is performed over each sample.

REFERENCES:
patent: 4086915 (1978-05-01), Kofsky et al.
patent: 4653498 (1987-03-01), New, Jr. et al.
patent: 4800885 (1989-01-01), Johnson

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