A clinically usable pump apparatus for a dilatation device comprising a dilatation catheter, preferably for opening a stenosis and occlusions or for closing vessels, ducts and openings, while using a pumpable medium, which comprises a pump structured to accomplish the double function of producing positive...http://www.google.ca/patents/US4231715?utm_source=gb-gplus-sharePatent US4231715 - Clinically usable pump apparatus for a dilatation device
