Patent ID: 8657839

Claim:
A method for removing tissue at a target tissue region comprising: advancing a cannula to a target tissue region; advancing a tissue removal system through the cannula to a target tissue region, wherein the tissue removal system comprises a motor and a rotatable shaft assembly coupled to the motor, wherein the rotatable shaft assembly comprises: a shaft with a proximal opening along a side surface, a proximal groove adjacent to the proximal opening, a distal opening along a side surface, and a distal groove adjacent to the distal opening, wherein at least the distal grooves comprises an angular offset from a longitudinal axis of the shaft and the angular offset of the distal groove is greater than an angular offset, if any, of the proximal groove; a flexible elongate member coupled to the shaft through the proximal opening and the distal opening, wherein a proximal portion of the elongate member is at least partially seated within the proximal groove and the distal portion of the elongate member is at least partially seated within the distal groove, and the elongate member has a first retracted configuration and a second extended configuration, and wherein the tissue removal system is advanced with the elongate member in the first retracted configuration; transitioning the flexible elongate member to the second extended configuration; rotating the rotatable shaft assembly to cut the target tissue with the elongate member; and removing tissue from the target tissue region.