Pulse oximetry system
US11602311B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2019 |
| Grant date | Mar 14, 2023 |
| Priority date | — |
| Expiry date | Feb 2, 2041 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/746
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In one aspect, a computer-implemented method includes receiving signals corresponding to wavelengths of light detected by an optical sensor placed in proximity to a patient's body, and for each received signal: separating the signal into an AC signal and a DC signal; separating the AC signal into component signals; analyzing the component signals through a fractional phase transformation to identify a desired component signal and harmonic signals associated with the desired component signal; smoothing the desired component signal, the harmonic signals, and the DC signal; and combining the smoothed desired component signal, the smoothed harmonic signals, and the smoothed DC signal to generate a modulation signal. A modulation ratio signal is generated based on the modulation signals derived from the signals, and a peripheral oxygen saturation (SpO2) of the patient's body is determined based on the modulation ratio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.