Oximeter with motion detection for alarm modification
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United States of America Patent
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Sep 2, 1997
Issued Date -
N/A
app pub date -
Jan 29, 1996
filing date -
Mar 26, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A pulse oximeter which modifies the alarm condition when motion is detected. Basically, if the lack of a pulse is determined to be as a result of motion artifact, the generation of an alarm is postponed. In addition, the display indicates that motion is present and that the last reading is questionable due to the presence of motion. The invention also determines if motion artifact is present from the pulse oximeter detector signal itself. The ratio of the positive and negative peaks of the derivative of the pulse signal are compared to a motion/blood pulse threshold.
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