Method and apparatus for determining the recirculation in a fistula or the cardiopulmonary recirculation as well as the blood treatment device with a device for determining fistula recirculation or of the cardiopulmonary recirculation part

摘要

The invention relates to a method for determining the recirculation in a fistula and / or of the cardiopulmonary recirculation part during extracorporeal blood treatment, in which the material to be treated blood in an extracorporeal blood circuit i by means of a blood chamber 8 of a through a semipermeable membrane 7 in the blood chamber and a dialysis fluid chamber 9 divided dialyser 6 and dialysis fluid flows in a dialysis fluid path ii flows through the dialysis fluid chamber of the dialyser. In addition, the invention relates to a device for determining the recirculation in a fistula and / or of the cardiopulmonary recirculation part as well as a blood treatment device with a device for determining fistula recirculation and / or of the cardiopulmonary recirculation part. The method according to the invention and the device according to the invention are based on the fact that the sum of the fistula recirculation (r_A) and the cardiopulmonary recirculation portion (r_Cp), that is to say the total recirculation (r), for two different blood flow rates is determined which differ from one another. The fistula and / or the cardiopulmonary recirculation portion are / is then generated from the recirculation flow rates determined for both blood. The first recirculation measurement is carried out at a high blood flow (q_Bh), in the case of which a fistula can occur, while the second measurement in the case of a low flow of blood ..