A catheter having an elongated shaft with a proximal end, a distal end, and at least one lumen, and a distal portion of the shaft being at least in part within an outer sheath having a wedge-shaped distal end. In one embodiment, the outer sheath around the distal end of the shaft is the distal skirt...http://www.google.co.uk/patents/US7141059?utm_source=gb-gplus-sharePatent US7141059 - Balloon catheter having a flexible distal end
