SYSTEMS AND METHODS FOR DETERMINING BLOOD OXYGEN SATURATION VALUES USING COMPLEX NUMBER ENCODING

摘要

The disclosure includes pulse oximetry systems and methods for determining point-by-point saturation values by encoding photoplethysmographs in the complex domain and processing the complex signals. The systems filter motion artifacts and other noise using a variety of techniques, including statistical analysis such as correlation, or phase filtering.

主权项

1. A physiological monitor that computes arterial oxygen saturation in tissue material, the physiological monitor comprising:
a light emitter which emits light of at least first and second wavelengths; a light detector responsive to light from said light emitter attenuated by body tissue, said light detector providing an output signal indicative of at least first and second intensity signals associated with said at least first and second wavelengths; and a signal processor responsive to the first and second intensity signals to encode said first and second intensity signals in a complex time domain, to calculate arterial oxygen saturation from said encoded signals, and to output said saturation for caregiver review.