Extravasation detector using microwave radiometry
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United States of America Patent
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Sep 21, 1999
Grant Date -
N/A
app pub date -
Jun 14, 1996
filing date -
Jun 14, 1996
priority date (Note) -
Expired
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Abstract
A microwave antenna senses the temperature of tissue into which a fluid is to be injected. The fluid is injected by a needle or other vascular entry device connected to a fluid injector by a connector tube. The fluid temperature is measured by a temperature sensor attached to the connector tube. An alarm processor determines whether an extravasation occurs by comparing a temperature discrimination function derived from tissue temperature taken at different times with a calculated threshold value. The threshold value is calculated from the tissue temperature and the fluid temperature. The threshold value is recalculated and updated continuously during the fluid injection.
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