The invention provides a medical device having a catheter, an expandable occluding member and a constricting member. The catheter has a lumen communicating with a port at its distal end. The lumen and port are adapted for introduction of therapeutic or diagnostic devices, including an angioplasty/stent...http://www.google.se/patents/US6146370?utm_source=gb-gplus-sharePatent US6146370 - Devices and methods for preventing distal embolization from the internal carotid artery using flow reversal by partial occlusion of the external carotid artery
