Ear oximetry process and apparatus
Photodetector having an electrically conductive, selectively transmissive window
Blood constituent measuring device and method
Probe monitoring system for oximeter
Pulse oximeter monitor
Blood monitoring apparatus and methods with amplifier input dark current correction
Blood parameter monitoring apparatus and methods
Non-invasive measuring method and apparatus of blood constituents Patent #: 4927264
ApplicationNo. 040839 filed on 03/31/1993
US Classes:600/323, Oxygen saturation, e.g., oximeter356/41, Oximeters600/330Separation of ac/dc components in signal
ExaminersPrimary: Sykes, Angela D.
Attorney, Agent or Firm
International ClassA61B 005/00
AbstractAn electronic processor for calculating in vivo blood oxygenation concentration levels using pulsed light that eliminates both requirements for comparing photosensor signal amplitudes with analog/digital circuit dynamic ranges and also adjusting electronic processor parameters. The invention uses monolithic a/d converters with expanded capacity and a microcontroller/processor with a pulse control module to synchronize switching in an oversampling demodulator with pulsing of light sources to overcome prior circuitry limitations that consumed substantial central processor capacity.