Ear oximetry process and apparatus
Catheter oximeter apparatus and method
Multi-wavelength incremental absorbence oximeter
Blood constituent measuring device and method
Signal filter method and apparatus Patent #: 4453218
ApplicationNo. 06/467431 filed on 02/17/1983
US Classes:600/326, And other blood constituents356/41, Oximeters600/479Cardiovascular testing
ExaminersPrimary: Howell, Kyle L.
Assistant: Hanley, John C.
Attorney, Agent or Firm
International ClassesA61B 5/00 (20060101)
G01N 21/31 (20060101)
G01J 1/16 (20060101)
G01J 1/10 (20060101)
Foreign Application Priority Data1982-02-19 JP
AbstractA noninvasive device for photoelectrically measuring a property of arterial blood is provided. Light that contacts living tissue with arterial blood is converted into a pair of electrical signals. The electrical signals are processed to provide information of the amplitude of the measured signals and are further processed to produce a final output signal that is substantially a square function of a ratio between the electrical signals representative of the amplitudes.