Material removal device and method of use

摘要

A catheter having a tubular body and a rotatable shaft disposed within a lumen of the tubular body. A cutting element is coupled to the rotatable shaft, the cutting element having a cutting edge, the cutting element and rotatable shaft being longitudinally moveable within the tubular body between a stored position in which the cutting element is positioned distal of a side opening and a cutting position in which the cutting element is contained within the lumen of the tubular body and longitudinally aligned with the side opening. The cutting element is configured to extend through the side opening and to cut material from the wall of a vessel at a treatment site as the catheter is pulled proximally through the treatment site. The catheter may optionally have a rotating distal tip with an abrasive surface. The catheter includes a collection chamber positioned proximally of the cutting window.

主权项

1. A catheter for removing material from a vascular lumen comprising:
a tubular body having proximal and distal ends and a wall defining a lumen, the wall having a side opening positioned proximal of the distal end of the tubular body and an outer diameter adjacent the side opening; a rotatable shaft disposed within the lumen of the tubular body; a cutting element coupled to the rotatable shaft, the cutting element and rotatable shaft being longitudinally moveable within the tubular body between a stored position in which the cutting element is positioned distal of the side opening and a cutting position in which the cutting element is contained within the lumen of the tubular body and longitudinally aligned with the side opening; a cutting element exposure member within the tubular body, the cutting element exposure member being longitudinally moveable relative to the tubular body and the cutting element between a distal position and a proximal position, the cutting element exposure member being configured such that movement of the cutting element exposure member from the distal position to the proximal position when the cutting element is in the cutting position results in movement of the cutting element from the cutting position to an extended position in which a portion of the cutting element is extended through the side opening beyond said outer diameter of the wall of the tubular body.