Calibration of segmental blood volume charges in arteries and veins for pulse volume recorder
US5630424A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2560/0223
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The method of calibrating includes selecting discrete levels of cuff pressure and placing the artery or vein under study under discrete levels of induced pressure with a closed pneumatic system contained by the pressure cuff, substantially continually sensing cuff pressures at each discrete level and thereby sensing blood volume change through the artery, electronically determining when a certain number of representative time-based blood volume change signals are substantially equivalent, changing the volume in the closed pneumatic system at each discrete cuff pressure by a pre-determined volumetric amount after determining substantial equivalency, electronically generating a calibration signal at each discrete cuff pressure based upon the calibrated volume change and, correcting the blood volume representative signal based upon the calibration signal at each discrete level of pressure. The calibration device includes, in one embodiment, a controllable pneumatic pump, a pressure sensor, a computerized device for determining when a representative number of blood volume change signals (based on the pressure sensor signals) are substantially similar and thereafter generating a calibra…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.