Patent ID: 8647289

Claim:
A blood processing device for collecting and exchanging blood components, the blood processing device comprising: a 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 draw/return line fluidly connecting the venous-access device and the blood component separation device for drawing whole blood from a subject and returning the first blood component to the subject; a first pressure sensor located on the draw/return line between the blood component separation device and the venous-access device for determining a first pressure within the draw/return line; a second pressure sensor located on the draw/return line between the first pressure sensor and the venous-access device for determining a second pressure within the draw/return line; and a pump connected to the draw/return line for controlling a flow rate within the draw/return line, the pump controlling the flow rate based on a subject access pressure determined based on the first pressure and the second pressure.