Sensor for transcutaneous measurement of vascular access blood flow
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United States of America Patent
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Jan 17, 2006
Issued Date -
N/A
app pub date -
Dec 9, 2003
filing date -
Dec 29, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical sensor includes photoemitter and photodetector elements at multiple spacings (d1, d2) for the purpose of measuring the bulk absorptivity (α) of an area immediately surrounding and including a hemodialysis access site, and the absorptivity (αo) 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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