Patent ID: 8702637

Claim:
A blood processing device for collecting and exchanging blood components comprising: a single needle venous-access device for drawing whole blood from a subject and returning unused blood components to the subject; a blood component separation device for separating the drawn whole blood into a first blood component and a second blood component, the blood component separation device configured to send the second blood component to a second blood component storage container; a return line fluidly connected to the single needle venous-access device and the blood component separation device for returning the first blood component to the subject; a draw line fluidly connected to the single needle venous-access device and the blood component separation device for drawing whole blood from the subject and into the blood component separation device a first pressure sensor located on the return line between the blood component separation device and the single needle venous-access device for determining a first pressure; a second pressure sensor located on the draw line between the blood component separation device and the single needle venous-access device for determining a second pressure; and a first pump connected to at least one of the return line and the draw line for controlling a flow rate within the connected line, the pump controlling the flow rate based on a pressure at the single needle venous access device and determined based on the first pressure and the second pressure.