Digital oximeter
Patent 4266554 Issued on May 12, 1981. Estimated Expiration Date: 
June 19, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 19, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3677648 3787124 3825342 3847483 Method of measuring ocular pulse Photoelectric oximeter Ear oximetry process and apparatus 4095117 Multi-wavelength incremental absorbence oximeter Optical assembly for detecting an abnormality of an organ or tissue and method Patent #: 4213462 InventorAssigneeApplicationNo. 06/050097 filed on 06/19/1979US Classes:600/323, Oxygen saturation, e.g., oximeter356/41OximetersExaminersPrimary: Michell, Robert W.Assistant: Jaworski, Francis J. Attorney, Agent or FirmInternational ClassesA61B 5/00 (20060101)G01N 21/31 (20060101) Foreign Application Priority Data1978-06-22 JPAbstractA 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.Other References
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