Eye fundus oximeter
Method and apparatus for the continuous monitoring of hemoglobin saturation in the blood of premature infants Patent #: 4485820
ApplicationNo. 235692 filed on 08/22/1988
US Classes:351/221, Including illuminator600/318, Determining constituents in eye600/323Oxygen saturation, e.g., oximeter
ExaminersPrimary: Dzierzynski, Paul M.
Attorney, Agent or Firm
International ClassesA61B 003/10
AbstractThis invention provides for the measurement of relative oxygen saturation of the choriodal blood of the fundus of the eye of a subject by directing into the eye a source beam of light including incandescent, red and infrared light, the combined beam penetrating the choroid and impinging on the sclera of the eye, the beam then being reflected back out of the eye as a collimated beam of light. The collimated beam of light is directed to a dichroic beam splitter where the red and infrared light are separated from the beam and are subject to the measurement of their respective intensities. The measured intensities of the red and infrared light components of the collimated beam reflected from the eye are compared with the measured intensities of the red and infrared light components of the separated portion of the source beam of light to determine the ratio of oxyhemoglobin to reduced hemoglobin.