Digital oximeter
US4266554A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Jun 19, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/314
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital oximeter for noninvasively measuring oxygen saturation of the arterial blood is provided. Photoelectric transducers measure the light intensity after passing through living tissue to produce at least a pair of output signals of different wavelengths of light. A sample hold circuit is provided for correspondingly storing each of the respective output signals. A microprocessor controlled pulse activates a subsequent subtraction step between a second measurement taken for each of the respective wavelengths to correspondingly produce at least a first and second subtraction output. The circuit can then process at least the first and second stored light outputs and the first and second subtraction outputs to indicate the oxygen saturation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.