Patent ID: 7236811
Filing Date: 2007-06-26
Classification: A61B,G01N

Abstract:
1. A device for measuring body fluid-related metrics using optical spectrophotometry comprising: a probe housing configured to be placed proximal to a tissue location which is being monitored; light emission optics connected to said housing and configured to direct radiation at said tissue location; light detection optics connected to said housing and configured to receive radiation from said tissue location; and a processing device configured to process radiation from said light emission optics and said light detection optics to compute said body fluid-related metrics, wherein said light emission optics emit radiation at a plurality of spectral wavelengths chosen to be preferentially absorbed by tissue water, non-heme proteins and lipids, where preferentially absorbed wavelengths are wavelengths whose absorption is substantially independent of the individual concentrations of non-heme proteins and lipids, and is substantially dependent on the sum of the individual concentrations of non-heme proteins and lipids.