Noninvasive measurement of hematocrit and hemoglobin content by differential optical analysis
US5277181A · kind A · utility
323Cited by
50References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1991 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Dec 12, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/14551
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention relates to the noninvasive measurement of blood hematocrit and hemoglobin content using differential optical absorption of two or more wavelengths of light during blood volume changes. The method is also useful for noninvasive measurements of other blood analytes, such as glucose, where variations in hematocrit or blood hemoglobin concentration cause errors in the measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.