Patent ID: 8617093
Filing Date: 2013-12-31
Classification: A61M

Abstract:
1. A method for monitoring a fluid system of an extracorporeal blood treatment apparatus, said extracorporeal blood treatment apparatus comprising: a dialyser or filter subdivided into a first chamber and a second chamber by a semipermeable membrane, an extracorporeal blood circuit having an arterial blood line leading to the first chamber and a venous blood line leading away from the first chamber, a venous drip chamber arranged in the venous blood line downstream of the first chamber, a venous locking organ arranged in the venous blood line downstream of the venous drip chamber, a ventilation line branching off from the venous drip chamber, and at least one hydrophobic filter arranged in said ventilation line that can be closed off by a ventilation valve arranged in a section of the ventilation line remote from the venous drip chamber, said method comprising the following steps: measuring a pressure in the ventilation line in the section of the ventilation line remote from the venous drip chamber; alternately at least partly opening and closing the venous locking organ, whereby the fluid level in the venous drip chamber alternately rises and falls, as a result of which the measured pressure signal is subject to pressure variations if there is no fault; evaluating the measured pressure signal; and detecting a fault if pressure variations of the measured pressure signal are absent.