Method and the device which detect the air in the external blood circulating road of the flow system and the especially blood processor

摘要

This invention reach in blood processing unit (1) artery branch and the blood processing unit which the vein branch which comes out from (1) (11) with regards method and the device which detect the penetration of the air to the external blood circulating road of the fluid system and the especially blood processor which it possesses. Periodic fluctuation inside the fluid system and the especially artery tube, the artery tube (6) the blood pump which is arranged inside (10) is measured on high-level side. The periodic pressure signal which was measured, functional system and especially system of orthogonal functions, for example the spectrum was disassembled in sine function and cosine function, when the boundary value to which among factors of function one is beforehand set at least is exceeded or it presumes that the air penetrated into the case where it is less than.