Title :
A Proposed Miniature Red/Infrared Oximeter Suitable for Mounting on a Catheter Tip
Author :
Yee, Sinclair ; Schibli, Eugen ; Krishnan, Vedavalli
Author_Institution :
Microtechnology Laboratory, Center for Bioengineering, and the Department of Electrical Engineering, University of Washington
fDate :
3/1/1977 12:00:00 AM
Abstract :
A miniature red/infrared oximeter has, been developed that is suitable for mounting on a catheter tip and does not use fiber-optics. Two light-emitting diodes (LED´s) and a phototransistor are mounted on the catheter tip such that conversion between optical and electrical signals takes place right at the tip. In vitro calibration shows that the infrared-to-red reflectance ratio is essentially linearly dependent on oxygen saturation (OS). The calibration constants depend on hematocrit and on blood flow.
Keywords :
Biomedical optical imaging; Blood; Catheters; In vitro; Instruments; Light emitting diodes; Optical fibers; Optical reflection; Phototransistors; Signal processing; Humans; Miniaturization; Oximetry;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.1977.326129
