Examination apparatus for measuring oxygenation in body organs
US4907876A · kind A · utility
97Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 1988 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | May 2, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/14553
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An examination apparatus which measures the oxygenation in objects with near infrared light transmission spectrophotometry and that automatically adjusts a transmission light quantity to a magnitude suitable for detection by a photomultiplier tube. The examination apparatus comprises a ring-like ND filter whose transmission factor varies along its circumference, a filter driver for automatically setting a transmission factor of a filter, and a light source control device for automatically controlling output powers of light sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.