System and method for measuring blood urea nitrogen, blood osmolarity, plasma free hemoglobin and tissue water content
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United States of America Patent
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Feb 3, 2004
Grant Date -
Sep 6, 2001
app pub date -
Jan 22, 2001
filing date -
Oct 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Systems and methods are provided for noninvasively measuring the levels of urea, blood osmolarity (or Na.sup.+), plasma free hemoglobin and tissue water content in a patient's blood or tissue. Light of selected wavelengths is passed through blood or body tissue and the transmitted or reflected light is detected and the detected signals can be electronically compared and manipulated to provide the non-invasive, continuous and quantitative display of a patient's blood urea, blood osmolarity (or Na.sup.+), plasma free hemoglobin and tissue water content.
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