An intraluminal catheter with an elongated tubular shaft with proximal, intermediate, and distal shaft sections for positioning a therapeutic or diagnostic device within a patient's body region such as a heart chamber. The intermediate shaft section has greater flexibility than the proximal or distal...http://www.google.es/patents/US6036677?utm_source=gb-gplus-sharePatente US6036677 - Catheter with flexible intermediate section
