Method of measuring ocular pulse
Ear oximetry process and apparatus
Multi-wavelength incremental absorbence oximeter
Optical assembly for detecting an abnormality of an organ or tissue and method Patent #: 4213462
ApplicationNo. 06/050097 filed on 06/19/1979
US Classes:600/323, Oxygen saturation, e.g., oximeter356/41Oximeters
ExaminersPrimary: Michell, Robert W.
Assistant: Jaworski, Francis J.
Attorney, Agent or Firm
International ClassesA61B 5/00 (20060101)
G01N 21/31 (20060101)
Foreign Application Priority Data1978-06-22 JP
AbstractA digital oximeter for noninvasively measuring oxygen saturation of the arterial blood is provided. Photoelectric transducers measure the light intensity after passing through living tissue to produce at least a pair of output signals of different wavelengths of light. A sample hold circuit is provided for correspondingly storing each of the respective output signals. A microprocessor controlled pulse activates a subsequent subtraction step between a second measurement taken for each of the respective wavelengths to correspondingly produce at least a first and second subtraction output. The circuit can then process at least the first and second stored light outputs and the first and second subtraction outputs to indicate the oxygen saturation.