Method and device for detecting air in a fluid system, in particular in an extracorporeal blood circuit of a blood treatment device
US8430834B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 2007 |
| Grant date | Apr 30, 2013 |
| Priority date | — |
| Expiry date | Dec 4, 2028 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M1/3639
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention relates to a method and to a device for detecting the entry of air in a fluid system, in particular in an extracorporeal blood circuit of a blood treatment device comprising an arterial branch leading to the blood treatment unit and a venous branch leading from said blood treatment unit. Periodic fluctuations in the fluid system, in particular in the arterial tube, are measured upstream of the blood pump arranged in said arterial tube. The measured periodic pressure signal is analyzed spectrally in a system of functions, in particular a system of orthogonal functions, for example sine and cosine functions and the entry of air is deduced if at least one of the coefficients of the functions exceeds or falls below predefined threshold values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.