Venous pulse oximetry
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United States of America Patent
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Aug 28, 2007
Grant Date -
Nov 17, 2005
app pub date -
Jan 31, 2003
filing date -
Jan 31, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of non-invasively measuring venous oxygen saturation, comprising: applying a pressure transducer at a first site on a body, applying a drive signal to the external pressure transducer at a predetermined frequency, to cause a series of pulsations of a predetermined magnitude in the venous blood volume in the vicinity of said first site, applying an oximeter device at a second site on the body, measuring output signals received from said oximeter device, said output signals containing a component representative of the modulation of venous blood volume due to said pulsations, deriving a measure of venous oxygen saturation from the frequency response of said output signals.
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