Photoplethysmograph signal-to-noise line enhancement
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United States of America Patent
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Mar 2, 2004
Grant Date -
Nov 14, 2002
app pub date -
Jun 11, 2002
filing date -
Apr 18, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A ring plethysmograph having a pressure adjustment for locally pressurizing one side of a finger thereby biasing the pressure on an artery wall so that the plethysmograph is optimally sensitive without interfering with blood flow. An auxiliary photodetector, possibly with a second light source, is disposed on the low-pressure side of the finger for two purposes: providing a noise reference for canceling noise on the plethysmograph signal, and also for providing a separate motion signal for monitoring the activity level of a patient.
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