Upstream occulsion detection system

摘要

A pumping segment of a fluid line alternately in fluid communication with the upstream and downstream portions of the fluid line connects a fluid supply to a fluid receiver. A pressure sensor located downstream of the segment monitors the pressure during the segment's communication with the upstream and downstream ends. The pressure difference is used to establish a pressure threshold against which the average pressure is compared to determine if an upstream occlusion exists. Should the average pressure fall within a cautionary zone, the pump is reversed to examine the pressure difference once again. Based on the pressure difference during the reversal, a pressure threshold line may be adjusted thereby adapting to fluid administration conditions.