Optical determination of blood perfusion and similar parameters
US9549695B2 · kind B2 · utility
1Cited by
16References
18Claims
0Family size
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Key dates
| Filing date | Feb 26, 2010 |
| Grant date | Jan 24, 2017 |
| Priority date | — |
| Expiry date | Jul 7, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/01
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A parameter affecting the absorptivity or the concentration of blood in tissue is measured using a semiconductor light source (7) and a light detector (8). The semiconductor light source (7) is operated at several operating conditions, at which it has different temperatures and therefore different emission spectra. In particular, the operating conditions correspond to different time intervals after switching the light source (7) on, while the light source (7) has not yet reached thermal equilibrium. This allows to perform a spectroscopic measurement using one light source only, which increases accuracy and reduces device cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.