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  • Atherectomy angioplasty catheters that cut or shave atheroma and directly remove the excised material from the vessel using a collection chamber or suction port. These catheters typically consist either of a semiflexible catheter which includes a cup-shaped cutter that slices atheroma at the center of a nonflexible housing, and an opposing dilated balloon that forces the plaque through a window into the metal housing during each cut (directional atherectomy); or of a semiflexible, torque-controlled, hollow catheter that includes an introducer sheath over a central guide wire for proper alignment with the atherosclerotic lesion, a rotating cone-shaped cutter in a housing unit to shave the plaque, and a collecting vacuum bottle situated at the proximal end of the catheter (transluminal extraction catheters). Extirpative atherectomy catheters are mostly used for treating short, discrete, eccentrically placed atheroma, including calcific eccentric stenoses not normally amenable to balloon dilatation.
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