Method of measuring blood pressure with a photoplethysmograph
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United States of America Patent
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Aug 25, 1992
Issued Date -
N/A
app pub date -
Feb 15, 1991
filing date -
Sep 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for determining arterial blood pressures using a photoplethysmograph is provided. In the inventive method the photoplethysmograph output is calibrated to the patient using an auxiliary blood pressure determining instrument, a constant k particular to the patient's arterial blood pressure-volume relationship is determined and is stored for later use; at the time of measurement information is obtained from the photoplethysmograph output; and a computer determines the patient's systolic and diastolic blood pressure.
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