Separating motion from cardiac signals using second order derivative of the photo-plethysmogram and fast fourier transforms
US8073516B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2006 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Dec 27, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/726
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention is directed toward a pulse oximetry system for the determination of a physiological parameter capable of removing motion artifacts from physiological signals comprises a hardware subsystem and a software subsystem. The software subsystem is used in conjunction with the hardware subsystem to perform a method for removing a plurality of motion artifacts from the photo-plethysmographic data and for obtaining a measure of at least one physiological parameter from the data. The method comprises acquiring the raw photo-plethysmographic data, transforming the data into the frequency domain, analyzing the transformed data to locate a series of candidate cardiac spectral peaks (primary plus harmonics), reconstructing a photo-plethysmographic signal in the time domain with only the candidate cardiac spectral peaks (primary plus harmonics), computing the second order derivative of the reconstructed photo-plethysmographic signal, analyzing the candidate second order derivative photo-plethysmographic signal to determine the absence or presence of cardiac physiologic signal characteristics, and finally selecting the best physiologic candidate from the series of potential ca…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.