A balloon dilatation catheter comprising an elongated tubular shaft and an inner tube defining inflation and guide wire lumens. A dilatation balloon is mounted on the distal end of the tubular shaft and communicates with the inflation lumen. The guide wire lumen extends through the balloon. A stiffening...http://www.google.ca/patents/US5823995?utm_source=gb-gplus-sharePatent US5823995 - Dilatation catheter with stiffening wire anchored in the vicinity of the guide wire port 
