A catheter device regulates fluid flow within a circulatory vessel. Included is an elongated catheter body configured to access one of a circulatory vessel or a heart chamber. The catheter body includes a proximal end, a distal end, and a first lumen including an open proximal end and...http://www.google.de/patents/US5827237?utm_source=gb-gplus-sharePatent US5827237 - Dual lumen catheter with controlled antegrade and retrograde fluid flow
