Catheter oximeter apparatus and method

Details Catheter oximeter apparatus and method Catheter oximeter apparatus and method

G - Physics

01

J

73/168, 73/57, 7

G01J 3/46 (2006.01) A61B 5/00 (2006.01) G01N 21/00 (2006.01) G01N 21/31 (2006.01)

Patent

CA 1086982

IMPROVED CATHETER OXIMETER APPARATUS AND METHOD ABSTRACT OF THE DISCLOSURE An improved catheter oximeter operates on radiation at three or more different wavelengths applied to and scatter- ed back from blood under test to provide an indication of oxygen saturation and is considerably less sensitive to accu- racy degrading variations in the blood and its environment and in the oximeter measuring system. Typically there is produced a corresponding electrical signal representative of the intensity of the radiation received back from the blood under test at each of the three wavebands. A first output is produced which is representative of the ratio of one pair of electrical signals. A second output is produced which is representative of the ratio of another pair of the electrical signals. Third and fourth outputs representative of the algebraic combination of selectively weighted first and second outputs are produced, and an output manifestation of oxygen saturation is produced as the ratio of the third and fourth outputs.

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