Chronic total occlusion treatment system using low refractive index materials

An atherectomy device for removing atherosclerotic material within a blood vessel, comprising:

• a tubular housing coupled to or extending from a distal end of a catheter, wherein the tubular housing comprises:
• a housing lumen configured to be in fluid communication with a catheter lumen of the catheter,
• a cutting window defined along a portion of the tubular housing, and
• a rotatable cutter configured to debulk the atherosclerotic material extending into the cutting window;
• a collection chamber coupled to the tubular housing, wherein the collection chamber is configured to collect the atherosclerotic material debulked by the rotatable cutter, wherein the collection chamber is in fluid communication with the housing lumen;
• and
• an inflatable balloon coupled to an exterior side of the tubular housing, wherein the inflatable balloon comprises a balloon lumen in fluid communication with the housing lumen such that fluid introduced into the housing lumen via the catheter lumen clears a field in proximity to the cutting window and inflates the inflatable balloon.

A method of debulking atherosclerotic material within a blood vessel, comprising:

• introducing a tubular housing of an atherectomy device into the blood vessel and into proximity to the atherosclerotic material, wherein the tubular housing is coupled to or extending from a distal end of a catheter, and wherein the tubular housing comprises:
• a housing lumen configured to be in fluid communication with a catheter lumen of the catheter,
• a cutting window defined along a portion of the tubular housing, and
• a rotatable cutter;
• inflating a balloon coupled to an exterior side of the tubular housing using a fluid introduced into the housing lumen via the catheter lumen, wherein a balloon lumen of the balloon is in fluid communication with the housing lumen;
• and
• flushing a field in proximity to the tubular housing with the fluid introduced into the housing lumen.