Noncontactive arterial blood pressure monitor and measuring method
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Jun 29, 1987
filing date -
Jun 29, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An automatic, continuous, non-occlusive blood pressure monitor includes a pressure applying cuff for temporarily applying pressure to a person's finger, a light source for illuminating the finger and an artery in the finger, a photosensor for detecting light transmitted through or reflected from the finger and for producing a signal representing relative volume of a unit length of the artery, a pressure sensor for producing a pressure signal representing the pressure applied by the cuff to the finger, and a microprocessor for developing from the relative volume signal and the pressure signal a formulation of arterial pressure P(t) as a function of relative arterial volume, and for calculating the arterial pressure P(t) from the relative volume signals.
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