Apparatus and method for monitoring respiration with a pulse oximeter
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United States of America Patent
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Mar 23, 2004
Grant Date -
Aug 28, 2003
app pub date -
Feb 22, 2002
filing date -
Feb 22, 2002
priority date (Note) -
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Abstract
An apparatus and method for monitoring a secondary physiological process through variations caused by the secondary process in an optical signal used to calculate values related to blood oxygen levels. In particular, the optical signal may be divided into distinct portions such that a portion more directly affected by a particular secondary physiological process may be isolated and the secondary physiological process monitored. The apparatus and method is particularly useful for photoplethysmographically monitoring a patient's respiration frequency through changes in relative concentrations of blood oxygen related values that are proportionally related to the amounts of venous and arterial blood in a portion of tissue.
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