Surgery – Diagnostic testing – Measuring or detecting nonradioactive constituent of body...
Patent
1996-09-30
1998-06-16
Bahr, Jennifer
Surgery
Diagnostic testing
Measuring or detecting nonradioactive constituent of body...
600473, 600476, 600504, A61B 500
Patent
active
057661278
ABSTRACT:
An improved method and apparatus for the monitoring perfusion of the tissue of a patient by arterial blood is provided. An optical path length change is calculated for a number of digitized samples of a received light intensity signal generated by a photo detector that receives light directed into a patient's tissue by one or more light emitting diodes or laser diodes. The optical path length changes are summed over a predetermined time such as one half cardiac cycle or other set interval to generate a perfusion index. An average perfusion index value may also be generated. In calculating the perfusion index spectral content compensation may be employed to compensate for the variety of center wavelengths associated with the spectral contents of various emitters.
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Pologe Jonas A.
Tobin, Jr. Robert M.
Bahr Jennifer
Ohmeda Inc.
Pace Salvatore P.
Schoneman William A.
Yarnell Bryan K.
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