Yelena Nabutovsky,Gene A. Bornzin,Taraneh Ghaffari Farazi,John W. Poore
申请号：
US11877056
公开号：
US08175668B1
申请日:
2007.10.23
申请国别(地区):
US
年份:
2012
代理人:
摘要：
An intravenous implantable optical sensor assesses the relative absorbance of multiple wavelengths of light in order to determine oxygen saturation. The calculation of oxygen saturation is enhanced by use of a function of hematocrit which is derived from the relative absorbance of light of an isobestic wavelength along two different length paths through the blood. The use of the hematocrit-dependent term and multiple wavelengths of light to calculate oxygen saturation provides results that are less susceptible to noise and variation in hematocrit and thus provides a more accurate measure of oxygen saturation over a wider range of conditions than previously possible. The optical sensor may form part of an implantable system which performs the calculation of oxygen saturation and uses the results for a diagnostic or therapeutic purpose.
