Method and apparatus for determining hemoglobin oxygenation such as in ocular and other vascular beds
US5318022A · kind A · utility
Inventors
Key dates
| Filing date | Mar 1, 1991 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Mar 1, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2021/3148
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.