A dilatation catheter is described wherein a primary perfusion port is provided adjacent the proximal end of the inflatable member having a transverse cross-sectional area which is dimensioned to provide the bulk of the perfusion flow through the catheter. The primary perfusion port is offset from the...http://www.google.com/patents/US5195971?utm_source=gb-gplus-sharePatent US5195971 - Perfusion type dilatation catheter
