Method for noninvasive continuous determination of physiologic characteristics
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United States of America Patent
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Nov 16, 2004
Grant Date -
Jun 12, 2003
app pub date -
Nov 7, 2001
filing date -
Oct 6, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention comprises methods for noninvasively monitoring physiological characteristics of a patient's blood. Determinations of blood constituent concentrations may be made by comparing absorbance of radiation at varying parameters, such as path length and blood pressure. Preferably, changes in pressure are effected by changing the height of the probes relative to the patient's heart. Determinations of blood pH may be made by comparing absorbance of the blood at different wavelengths. The temperature of the blood, and thus of the patient's core, may also be accurately determined. Further, cardiac output characteristics and blood pressures may be noninvasively determined using the methods of the invention.
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