Method and apparatus for discriminating between valid and artifactual pulse waveforms in pulse oximetry
US5588425A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1995 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | May 1, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/1135
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for use in pulse oximetry for discriminating between valid pulse waveforms and artifactual pulse waveforms. Systolic upstroke times for valid pulse waveforms are in a consistent, narrow range which varies only slightly from subject to subject. This narrow range, which may be defined empirically for each subject or established by a default setting applicable to all subjects, defines a predetermined range of systolic upstroke times indicative of valid pulse waveforms. The systolic upstroke time of each pulse waveform is compared against the predetermined range, and pulse waveforms are deemed valid only if their systolic upstroke times are within the predetermined range. Only arterial oxygen saturation levels based on validated pulse waveforms are accepted. The present invention may also be used to validate the heart rate and/or R-R, intervals of an ECG, and for discriminating between sleep and wakefulness in a monitored subject.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.