Optics: measuring and testing – Blood analysis – Hemoglobin concentration
Patent
1980-08-06
1982-11-02
Punter, William H.
Optics: measuring and testing
Blood analysis
Hemoglobin concentration
356 41, 356 73, 356414, G01N 2125, G01N 2135, G01N 3348
Patent
active
043571050
ABSTRACT:
A compact, portable, clinical instrument dedicated to hemoglobin determination employs an L.E.D. light source with a peak output wavelength of about 553 nanometers and a yellow-blocking filter with a long wavelength cut-off not longer than about 565 nanometers. Thus, the relative amount of energy incident upon the blood sample in the 540 nm. hemoglobin absorption band is maximized. In addition to the L.E.D., the photodetector and the amplifying, inverting, log conversion, digital conversion, display and power supply regulation circuits are also exclusively solid-state. The display is of the reflective or liquid crystal type, and the power supply regulator is a sophisticated integrated circuit containing the equivalent of many discrete components. As a result, current consumption is minimized, and battery life and instrument accuracy are maximized. As an alternative illumination source, an infra-red L.E.D. can be employed, and the instrument is then capable of blood turbidity measurement. In either case, the L.E.D. illumination source is powered by a constant-current regulator, which minimizes errors due to fluctuations in illumination intensity.
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Buffalo Medical Specialties Mfg., Inc.
Punter William H.
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