Patent ID: 7494484

Claim:
A method of removing particulate debris from a vessel using a catheter assembly the method comprising: inserting and advancing a sheath having a discharge lumen to a location in the vessel said delivery sheath discharge lumen coupled to a collection vessel, said sheath not having an occlusion balloon thereon such that said sheath partially blocks the vessel but allowing some blood flow in the vessel; inserting and advancing an interventional device to a treatment location said interventional device of type having; an elongate body enclosing a fluid supply lumen and an angioplasty therapy inflation lumen; said elongate body having a central axis extending in the direction of the therapy balloon; a gap communicating with said fluid supply lumen for introducing a primary fluid jet flow in said vessel, said gap located distal of a therapy balloon, said gap projecting said fluid jet in an initial direction away from the central axis of the interventional device; a tapered wall located immediately adjacent said gap, and forming an annular surface next to the gap on the interventional device; said wall serving to restrict entrainment of fluid by said primary fluid flow, thereby creating a pressure difference across said primary fluid jet flow such that said primary fluid flow turns through an angle away from said initial direction away from said wall and turns toward said wall thereby exhibiting the Coanda effect; delivering angioplasty treatment located near the distal tip of said elongate body; injecting a primary fluid; and promoting retrograde flow into said discharge lumen.