Method and apparatus for indicating repetition intervals of a specified component of a composite electrical signal, particularly useful for displaying fetal r-waves
US4945917A · kind A · utility
Inventors
Key dates
| Filing date | May 23, 1988 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | May 23, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7239
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The method and apparatus particularly are applicable for displaying the fetal R-wave with respect to the maternal R-wave, and comprise the steps of generating a first electrical signal corresponding to the second derivative of the composite signal (maternal R-wave); generating a second electrical signal corresponding to the second derivative of the composite signal after the specified component has been removed; subtracting the second electrical signal from the first electrical signal to produce a third electrical signal; and utilizing the third electrical signal for indicating the repetition intervals (fetal R-waves) of the specified component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.