Sensor for transcutaneous measurement of vascular access blood flow
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United States of America Patent
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-
Apr 20, 2004
Grant Date -
Jun 14, 2001
app pub date -
Dec 29, 2000
filing date -
Oct 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical sensor includes photoemitter and photodetector elements at multiple spacings (d.sub.1, d.sub.2) for the purpose of measuring the bulk absorptivity (.alpha.) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (.alpha..sub.o) of the tissue itself. At least one photoemitter element and at least one photodetector element are provided, the total number of photoemitter and photodetector elements being at least three. The photoemitter and photodetector elements are collinear and alternatingly arranged, thereby allowing the direct transcutaneous determination of vascular access blood flow.
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