G - Physics – 01 – N
Patent
G - Physics
01
N
354/22
G01N 21/31 (2006.01) A61B 5/00 (2006.01) G01J 1/42 (2006.01) G01J 1/44 (2006.01)
Patent
CA 1321265
ABSTRACT OF THE DISCLOSURE This invention provides an apparatus and method for measuring variations in the opacity of blood due to blood volume changes related to Traube-Herring waves, respiration, heart pulsation, and hydrostatic pressure. Data relating to opacity variations is obtained by passing light of known wavelengths through blood containing tissue such as a finger or earlobe. For the purpose of determining the saturated oxygen content of the blood, the cyclic variations due only to the heart pulsations are extracted from the measurements and are corrected for the effects of the Traube-Herring waves. Calculation of heart rate and saturated oxygen content is performed using a programmed microprocessor. The same microprocessor also dynamically controls the data measurement function in a manner that optimizes the measurements under a variety of changing conditions.
580370
Flateau Ralph
Flower Ronald J.
Olsen Robert W.
Van Ells Michael A.
Nine Safety Appliances Company
Osler Hoskin & Harcourt Llp
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