Sensor for transcutaneous measurement of vascular access blood flow
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United States of America Patent
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Oct 12, 2004
Grant Date -
Sep 19, 2002
app pub date -
Mar 19, 2002
filing date -
Feb 5, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical sensor includes a sensing pair of complementary emitter and detector elements for measuring the bulk absorptivity (.alpha.) of an area parallel to and including a hemodialysis access site, and a normalizing pair of complementary emitter and detector elements for measuring the absorptivity (.alpha..sub.o) of the tissue itself perpendicular to the access site. The pairs of emitter and detector elements define two lines at right angles to each other, and one of the pairs lies to one side of the line defined by the other of the pairs, such that the two pairs of emitter and detector elements form a 'T' shape. Indicator dilution techniques are used to measure vascular access flow rates during routine hemodialysis, using the sensor.
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