Systolic pressure determining apparatus and process using integration to determine pulse amplitude
US4137907A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1976 |
| Grant date | Feb 6, 1979 |
| Priority date | — |
| Expiry date | Dec 27, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/7242
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Improved method and apparatus for identifying and quantizing a substantially periodic, steeply rising wavefront of a signal in the possible presence of low amplitude interference. A time derivative of at least the steep wavefront is obtained. The derivative is then integrated over a predetermined interval in each of successive repetitions of the steep wavefront, the interval being that during which the derivative exceeds a reference level. A threshold value is established, preferably dynamically, to verify or validate that when the derivative exceeds the reference level it indeed represents the steeply rising wavefront. The integrated derivative is recognized as the quantized value of the steeply rising wavefront only if such verification occurs. The invention is suited to oscillometric determination of systolic pressure in a patient, where measurement of signal amplitude is preferably achieved by integrating the time derivative of the systolic rise wavefront.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.