Extracorporeal blood treatment device and method for monitoring the integrity of a dialyzer of an extracorporeal blood treatment device

Abstract

The invention relates to an extracorporeal blood treatment device for performing an extracorporeal blood treatment, wherein blood flows through the blood chamber (2) of a dialyzer (1) in an extracorporeal blood circuit A, wherein the dialyzer is divided into the blood chamber (2) and a dialysate chamber (3) by a semipermeable membrane (4). The invention further relates to a method for monitoring the integrity of the dialyzer (1). According to the invention, the blood treatment device has a preparation mode, which prepares for the blood treatment and in which the dialysate chamber (3) of the dialyzer (1) (filter) is filled with a liquid, while the blood chamber (2) is not filled with blood, and a treatment mode, which follows the preparation mode and in which blood is conveyed through the blood chamber (2). In order to monitor the integrity of the dialyzer (1), the fluid system B including the dialysate chamber (3) or a part of the fluid system including the dialysate chamber (3) is filled with a liquid in the preparation mode. However, the blood chamber (2) is not filled with blood at this time. After the membrane of the dialyzer (1) has been wetted with liquid, liquid is withdrawnfrom the fluid system B including the dialysate chamber (3) such that a negative pressure p develops in the fluid system. The control and calculating unit (29) of the blood treatment device is configured in such a way that the increase in the magnitude of the negative pressure p measured by means of a pressure-measuring device (34) in a specified time interval is determined and the leakage rate LR of the fluid system is determined from the increase in the magnitude of the negative pressure in a specified time interval and from the compliance C of the fluid system B including the dialysate chamber (3). A lack of integrity of the dialyzer is then inferred on the basis of the determined leakage rate LR.

Description

technical field [0001] The invention relates to an extracorporeal blood therapy device for performing extracorporeal blood therapy, in which blood flows in an extracorporeal blood circuit through a blood chamber of a dialyzer which is divided by a semipermeable membrane into a blood chamber and a dialysis chamber liquid chamber. Furthermore, the invention relates to a method for monitoring the integrity of a dialyzer of an extracorporeal blood therapy device. Background technique [0002] During dialysis, the blood to be treated flows in the extracorporeal blood circuit through the blood chamber of the dialyzer, which is divided into a blood chamber and a dialysate chamber by a semipermeable membrane, while the dialysate flows through the dialysate chamber of the dialyzer in the fluid system. The extracorporeal blood circuit has a blood input line leading to and a blood output line from the blood compartment, and the fluid system has a dialysate input line leading to and a ...

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In addition, complex disinfection measures for the hydraulic system are required

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