Surgery – Truss – Pad
Patent
1995-07-10
1997-08-19
Sykes, Angela D.
Surgery
Truss
Pad
128664, 128665, A61B 500
Patent
active
056577540
ABSTRACT:
An apparatus for the non-invasive analysis of non-homogeneous samples is disclosed. The apparatus is particularly suited for analyzing biological samples having different constituents. An intensity modulated light beam is used to preferentially heat a selected constituent in the sample. This periodic heating will create thermal waves in the sample. A probe beam is directed to interact with the sample in the region which has been periodically heated. A phase synchronous detector is used to monitor the periodic changes in the probe beam caused by the thermal waves in the sample. In the preferred embodiment for monitoring blood glucose levels, the wavelength of the modulated light beam is selected to be absorbed in the hemoglobin of the red blood cells. The modulation frequency of the light beam is selected to set the thermal diffusion length of the thermal waves to permit interaction with the glucose molecules in the blood plasma. In addition, the phase synchronous detector is configured to monitor signals which occur ninety degrees out of phase with the modulation of the heating beam. In this manner, the output from the system can be most accurately targeted to the constituent of interest.
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Huang Stephen
Sykes Angela D.
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