Calibrated optical oximeter probe
Apparatus and method for measuring blood constituents
Diagnostic apparatus for measuring changes of arterial and venous blood volumes in brain with respiration signal modulation
System for disabling oximeter in presence of ambient light
Signal processing apparatus Patent #: 5632272
ApplicationNo. 979859 filed on 11/26/1997
US Classes:600/323, Oxygen saturation, e.g., oximeter600/336Detects constituents while excluding components (e.g., noise)
ExaminersPrimary: Cohen, Lee S.
Assistant: Yarnell, Bryan K.
Attorney, Agent or Firm
International ClassA61B 005/00
Foreign Application Priority Data1994-02-14 JP
AbstractA pulse oximeter includes a light-emitting device for repeating red light emission, infrared light emission, and no light emission with respect to an object to be measured every data sampling cycle in a measurement of a saturated oxygen in arterial blood, a light-receiving device for outputting a light-receiving signal obtained by receiving transmitted light or reflected light from the object to be measured; a noise level detecting device for detecting from the light-receiving signal a noise signal level at the time of no light emission in the light-receiving device, and a light-receiving signal generating device for obtaining a light-receiving signal of a level corresponding only to the red light emission and the infrared light emission by subtracting the noise signal level from each of light-receiving signal levels of the red light emission and the infrared light emission.
Field of SearchInfrared, visible light, or ultraviolet radiation directed on or through body or constituent released therefrom
Determining blood constituent
Oxygen saturation, e.g., oximeter
Detects constituents while excluding components (e.g., noise)
Visible light radiation