A perfusion balloon catheter which permits blood flow through the balloon even when the balloon is inflated. The balloon catheter comprises a thin-walled, collapsible and inflatable tube that has a proximal, generally straight portion, and a distal, helically coiled portion that is generally cylindrically...http://www.google.es/patents/US5181911?utm_source=gb-gplus-sharePatente US5181911 - Helical balloon perfusion angioplasty catheter
