PULMONARY PULSE OXIMETRY METHOD FOR THE MEASUREMENT OF OXYGEN SATURATION IN THE MIXED VENOUS BLOOD
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United States of America Patent
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Issued Date -
Nov 21, 2013
app pub date -
May 20, 2012
filing date -
May 20, 2012
priority date (Note) -
Abandoned
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Abstract
A method for obtaining diagnostic information relating to the lungs of a subject includes directing into tissue of the lungs of the subject light of a first wavelength and detecting part of the light that has passed primarily through microcirculatory tissue of the lungs and generating a signal which is a function of intensity of the detected light. The signal is then processed to derive a PPG curve for pulmonary microcirculatory arteries. The method is implemented using various locations for a light source and a detector, including various combinations of positioning on the thoracic wall, insertion into the esophagus, and in some cases, insertion of a probe through the thoracic wall to a position adjacent to the pulmonary pleura. Use of two different wavelengths allows derivation of mixed venous blood oxygen saturation.
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