Patent ID: 8475398

Claim:
An extracorporeal blood treatment system comprising: a blood circuit comprising a first blood passage coupled to a blood filter and a second blood passage coupled to the blood filter, wherein said first and second blood passages each are adapted to be coupled to a vascular system of a human patient; at least one blood pump connectable to the first blood passage, wherein said pump is adapted to move blood through the first and second blood passages and the filter, a filtrate collection container configured to receive filtrate withdrawn from the filter, a single air-in-blood detector configured to simultaneously monitor both the first and second blood passages, a pump controller operatively connected to the blood pump to control a rate of blood withdrawal into the blood circuit wherein the single air-in-blood detector comprises a housing including a slot configured to receive two or more passages configured as flow passages for extracorporeal blood; a transmitter of wave energy in the housing and oriented to direct wave energy across the slot and through the two or more passages, and a receiver of wave energy in the housing and oriented to receive wave energy transmitted by the transmitter, and the receiver configured to generate a signal indicative of the received wave energy passing through the two or more passages.