Electromagnetic method and apparatus to measure constituents of human or animal tissue
US5183042A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1991 |
| Grant date | Feb 2, 1993 |
| Priority date | — |
| Expiry date | Jul 3, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/359
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
To deterine glucose or other constituents of the human or animal body, near-infrared radiation containing two alternating wavelengths that have equal extinction coefficients in the tissue is directed onto a sample area of the body. The intensity relation of the two different wavelengths is adjusted so as to balance the two wavelength detected signals. The extracellular-to-intracellular fluid ratio of the tissue is changed or is allowed to change, and the alternating component of the transmitted beam power is measured. The amplitude of the alternating-current (AC) signal given by the detector represents glucose concentration or the difference from a preset reference concentration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.