Methods for determining invasively and in vivo pH in a human. The invasive method includes the steps of: generating light at three or more different wavelengths in the range of 1000 nm to 2500 nm; irradiating blood; measuring the intensities of the wavelengths emerging from the blood to obtain a set...http://www.google.fr/patents/US6061581?utm_source=gb-gplus-shareBrevet US6061581 - Invasive and in vivo near-infrared determination of pH
Invasive and in vivo near-infrared determination of pH