A thrombectomy device may include an elongate torsion member having a proximal end and a distal end, and a plurality of helically arranged engagement members disposed at a distal portion of the elongate torsion member. Preferably, at least a portion of the engagement members has a rounded, atraumatic shape. The engagement members have a collapsed state where the engagement members are compressed toward the elongate torsion member, and an expanded state where the engagement members are expanded radially outward. Preferably, the engagement members are attached to and extends radially outward from the elongate torsion member at a different longitudinal point such that the engagement members are spaced longitudinally and circumferentially from each other when in the expanded state. When the thrombectomy device is deployed in a body lumen or cavity, the engagement members expands out to contact a wall of the body lumen or cavity.
