A system and method for opening a lumen in an occluded blood vessel, e.g., a coronary bypass graft, of a living being. The system comprises an atherectomy catheter having a working head, e.g., a rotary impacting impeller, and a debris extraction sub-system. The atherectomy catheter is located within...http://www.google.ca/patents/US20020138088?utm_source=gb-gplus-sharePatent US20020138088 - System and method of use for agent delivery and revascularizing of grafts and vessels
