METHOD AND DEVICE FOR CONTROL OF ACCESS TO VESSELS, AND ALSO A DEVICE FOR EXTRACORPORAL PROCESSING OF BLOOD WITH A DEVICE FOR CONTROL OF ACCESS TO VESSELS

摘要

The invention relates to a method and apparatus for controlling access to vessels during extracorporeal processing of blood. The method and device according to the invention is based on monitoring the difference between the venous pressure measured in the extracorporeal circulation by means of a venous pressure sensor 19, and using an arterial pressure sensor 18 by arterial pressure, also called the difference in venous and arterial pressures. The invention is based on the understanding that interference is imposed on the measured values of the venous and arterial pressure, in principle making it difficult to reliably estimate the measured pressure signals to detect defective access to the vessels only on the basis of the pressure difference. In the method and device according to the invention is determined by the control function that describes the interference in the extracorporeal circulation circuit. Using the test function, the measured differential pressure is determined from the measured venous and arterial pressures, free from interference, which is used by the computing unit 22 to process data to detect defective vessel access.