The present invention is directed to a proximal catheter assembly that is configured to facilitate aspiration through a catheter lumen. The proximal catheter assembly enables natural aspiration to be achieved within the catheter lumen, for example, using an arterial-venous shunt, and further enables...http://www.google.de/patents/US20030187390?utm_source=gb-gplus-sharePatent US20030187390 - Proximal catheter assembly allowing for natural and suction-assisted aspiration
