Optical and ultrasound probe for monitoring blood volume changes
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United States of America Patent
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Oct 27, 2009
Grant Date -
N/A
app pub date -
May 19, 2004
filing date -
Oct 18, 2002
priority date (Note) -
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Abstract
An apparatus and method to assess the compressibility, density, and hematocrit of blood including an optical ultrasound probe clipped onto tubing in which blood is flowing. The probe includes a combination of ultrasound transducers, a light emitting diode, and photodiodes. An indicator medium is injected into the bloodstream of the subject over one or more time points. Ultrasound waves are emitted by a transducer and received by another transducer, and a novel signal-processing unit and a computer with a novel computation scheme process the ultrasound signals to assess the phase shift of ultrasound as it transmitted across the blood stream.
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