A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
73/59, 326/12.4
A61B 5/024 (2006.01)
Patent
CA 1324187
ABSTRACT OF THE DISCLOSURE In photoelectric apparatus such as a pulse oximeter for monitoring a parameter of the blood in a living organism, a dark current correction signal is applied to the input at the preamplifier. The correction signal is substantially equal in magnitude but opposite in sense to the photodetector output during dark intervals when the illumination means of the apparatus is disabled. Because dark current correction is accomplished at the input of the preamplifier, the preamplifier has substan- tially increased resistance to overloading caused by ambient light and hence may have higher gain.
581169
Boc Health Care Inc.
Gowling Lafleur Henderson Llp
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