Method and apparatus for determining hemoglobin oxygenation such

Details Method and apparatus for determining hemoglobin oxygenation such Method and apparatus for determining hemoglobin oxygenation such

1991-03-01

1994-06-07

Isabella, David

Surgery

Truss

Pad

128634, 128664, 128665, A61B 500, A61B 600

Patent

active

053180224

ABSTRACT:
An oximetry technique permits determination of hemoglobin oxygenation in vascular beds such as the inner retinal capillary beds. For a retinal application, an oximeter (FIG. 2) uses as a probe light source a multiline argon laser (11) that operates at three wavelengths in the hemoglobin absorption band, preferably 488, 501, and 514 nm. The oximeter optics module (30) attaches to the output end of a conventional slit lamp microscope (20). Reflected probe light is separated (34) into its constituent wavelengths, and photon counters (38) are used to measure light intensity for each wavelength. Data acquisition and analysis are performed by an oximeter processor (40) that computes hemoglobin oxygenation ratios from the intensity measurements, and determines the corresponding percent oxygen saturation.

REFERENCES:
patent: 4223680 (1980-09-01), Jobsis
patent: 4569354 (1986-02-01), Shapiro et al.
patent: 5072731 (1991-12-01), Taratuta et al.
patent: 5119814 (1992-06-01), Minnich

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