OXIMETER AND METHOD FOR IN VIVO DETERMINATION OF OXYGEN SATURATION IN BLOOD USING THREE OR MORE DIFFERENT WAVELENGTHS

摘要

Oximeter method and apparatus uses a test appliance that includes a source for directing radiation into skin tissue or other blood-confining container at three or more wavelengths and a detector for sensing the radiation intensity emanating from the skin tissue or other container at each wavelength. The oximeter method and apparatus also uses circuitry for combining the detector outputs in a predetermined manner to provide an indication of the oxygen saturation of the blood independently of position or movement of the test appliance on the patient and without first calibrating the indication on each patient.