Patent ID: 6144444
Filing Date: 2000-11-07
Classification: A61B

Abstract:
An apparatus for measuring blood parameters through conduit of an extracorporeal circuit, comprising:a light source which transmits light at a plurality of wavelengths to the conduit;a near sensor which senses light at a plurality of wavelengths connected to receive light a first distance from the light source which has been one of reflected and transmitted by the blood, wherein signals generated by the near sensor are indicative of the intensity of the sensed light at a plurality of wavelengths;a far sensor which senses light at a plurality of wavelengths connected to receive light a second distance from the light source which has been one of reflected and transmitted by the blood, wherein signals generated by the far sensor are indicative of the intensity of light at a plurality of wavelengths; andan arithmetic circuit connected to receive the signals from the near sensor and the far sensor and wherein the signals are used to calculate a parameter of blood and to generate an output signal indicative thereof.