Patent ID: 6304767
Filing Date: 2001-10-16
Classification: A61B,G01N

Abstract:
A device for determining blood hematocrit, the device comprising:an array of light sources for delivering radiation to a sample;a power supply;a modulation system in electrical contact with each of the light sources and the power supply, the modulation system configured to modulate electrical power delivered from the power supply to each of the light sources at a unique modulation frequency;a detection system comprising a first optical detector and a plurality of second optical detectors, the first optical detector being configured to receive radiation from the sample, and, in response generating a first set of radiation-induced electrical signals, each corresponding to radiation delivered from a separate light source to the sample, and the plurality of second optical detectors each being configured to detect radiation directly from one of the light sources, and, in response generating a second set of radiation-induced electrical signals, each corresponding to radiation delivered from a separate light source,a signal processor for receiving the first set of electrical signals and, in response, generating a first set of digital electrical signals;a microprocessor configured to receive the first set of digital electrical signals to calculate blood hematocrit, the microprocessor being programmed to first process the first set of digital electrical signals to determine a first spectrum and then processing the first spectrum or a spectrum determined from the first spectrum with a mathematical model to determine blood hematocrit.