An improved extracorporeal cannula apparatus suitable for use in a cardiac cannulation including a first elongated and flexible tube having an open proximal end and a distal end with at least one hole therein. At least one inflatable balloon is positionable within the lumen of the first tube adjacent...http://www.google.de/patents/US4285341?utm_source=gb-gplus-sharePatent US4285341 - Extracorporeal cannula apparatus with retractable intralumenal balloon and method for using same
