Catheters such as guide catheters can be configured to provide distal occlusion, while still providing sufficient interior lumen space for device delivery. Such catheters can also provide a desired level of flexibility, yet can include sufficient column support. A catheter can include an elongate shaft...http://www.google.com/patents/US20050197667?utm_source=gb-gplus-sharePatent US20050197667 - Occlusion balloon catheter with external inflation lumen
