Method and device for the detection of disruptions of the blood flow in an extracorporeal blood circuit
US8460552B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2004 |
| Grant date | Jun 11, 2013 |
| Priority date | — |
| Expiry date | Dec 18, 2028 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2230/207
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and device that identify impairments of the blood flow in an extra-corporeal blood circuit during extracorporeal treatment of the blood using an extracorporeal haemodialysis device, where the phase angle of at least one harmonic oscillation of an oscillating pressure signal that propagates in the extracorporeal blood circuit is determined. Impairments of the blood flow are detected in the extracorporeal blood circuit based on a characteristic modification of the phase angle of at least one harmonic oscillation of the pressure signal. A temporal modification of the phase angle may be compared with a predefined threshold value and an impairment is detected if the value of the modification of the phase angle is greater than the predefined threshold value. The method and device permit an early identification of a coagulation of the blood that flows through the haemodialysis unit, so that countermeasures can be initiated promptly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.