Optics: measuring and testing – Blood analysis – Hemoglobin concentration
Patent
1986-12-05
1989-05-30
Mis, David
Optics: measuring and testing
Blood analysis
Hemoglobin concentration
356 42, 356243, 2502521, 128633, G01N 3348
Patent
active
048345326
ABSTRACT:
A device and method for calibration of pulse oximeters is disclosed. A standard specimen that has optical charactertistics of hemoglobin of a known oxygen saturation is placed in the light path of a pulse oximeter probe. The image of a pulse is also created by providing a filter that periodically increases and decreases the amount of light allowed to reach the sensor of the probe. In one embodiment, the filter can comprise a pair of polarizing filters rotated with respect to one another. In another embodiment, a wedge of a filtering medium, such as oxygenated blood, is reciprocated in the light path, the wide portions of the wedge attenuating a greater amount of light than the narrow portions.
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Mis David
The State of Oregon Acting by and through the State Board of Hig
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