Method for detecting physiological condition of sleeping patient based on analysis of pulse waves
US6856829B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 24, 2001 |
| Grant date | Feb 15, 2005 |
| Priority date | — |
| Expiry date | Aug 24, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/02416
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A physiological condition detecting method detects pulse waves from the body of a patient, and creates the envelope of the pulse waves by connecting every peak of the pulse waves. It determines that the patient is in non-REM sleep, if the envelope fluctuates regularly. It determines that the patient is in REM sleep, if the envelope fluctuates irregularly. Further the method calculates and normalizes the amplitude and period of the envelope. It determines whether the patient has obstructive sleep apnea syndrome based on the normalized amplitude. It determines whether the patient has central sleep apnea syndrome based on the normalized period. It determines that the patient has mixed sleep apnea syndrome based on the normalized amplitude and the normalized period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.