Condensed oximeter system with noise reduction software
US5351685A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 5, 1991 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Aug 5, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7207
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A compact pulse oximetry system which separates the combined signal into its respective AC and DC components. By separating the signal into AC and DC components, a smaller order bit A/D converter may be used while still maintaining signal accuracy. Instead of using the combined signal to calculate the oxygen saturation content, the system microprocessor computes the Ratio of Ratios using the derivative of the separated AC component of the diffused signal to calculate the oxygen saturation of the measured fluid. To calculate the Ratio of Ratios, a ratio of the derivative value of the separated AC component is used. Instead of taking a single sample between the peak and valley of the signal, the oximeter system samples each value. To decrease the effect of system noise, a linear regression is performed over each sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.