Segmented head abrasion rotational atherectomy with improved abrasion efficiency

摘要

A rotational atherectomy device of high speed for opening a stenosis in an artery having a given diameter, comprising: a guidewire (15) having a diameter smaller than the maximum diameter of the artery; and an elongate flexible shaft rotary drive (20) which can be advanced over the guide wire (15), in that the drive shaft (20) has an axis of rotation; a head eccentric abrasion (100) attached to the drive shaft (20) characterized in that the head abrasion (100) comprises: a proximal segment (130) defining a lumen of the drive shaft therethrough, wherein the segment proximal (130) is mounted on the drive shaft (20); at least one separate eccentric cylindrical portion (135) of the eccentric proximal segment (130), wherein the at least one eccentric cylindrical portion (135) defines a lumen of the drive shaft therethrough, wherein the at least one cylindrical segment eccentric (135) is mounted distally and spaced from the proximal eccentric segment (130) in the drive shaft (20), wherein the at least one cylindrical segment (135) and the proximal segment (130) are spaced along the drive shaft (20) by a first space flexibility (G), and a separate eccentric distal segment (140) of at least one eccentric cylindrical segment (135) in the eccentric distal segment (140) defining a lumen shaft drive therethrough, wherein the distal segment is mounted eccentric distally and separated from at least one eccentric cylindrical segment (135) in the drive shaft (20), wherein the at least one cylindrical segment ex central (135) and the eccentric distal segment (140) are spaced along the drive shaft (20) by a second flexible space (G).