Noninvasive device for photoelectrically measuring the property of arterial blood
US4694833A · kind A · utility
213Cited by
8References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1986 |
| Grant date | Sep 22, 1987 |
| Priority date | — |
| Expiry date | Mar 13, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/1245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A noninvasive device for photoelectrically measuring a property of arterial blood is provided. Light that contacts living tissue with arterial blood is converted into a pair of electrical signals. The electrical signals are processed to provide information of the amplitude of the measured signals and are further processed to produce a final output signal that is substantially a square function of a ratio between the electrical signals representative of the amplitudes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.