Angled balloon dilatation catheter having a flexible elongate tubular member with first and second lumens extending therethrough and with proximal and distal extremities. An angled balloon is carried by the distal extremity of the tubular member. The elongate tubular member has a tubular element extending...http://www.google.ca/patents/US4771776?utm_source=gb-gplus-sharePatent US4771776 - Dilatation catheter with angled balloon and method
